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Posted to commits@hawq.apache.org by yo...@apache.org on 2016/08/29 16:46:49 UTC
[14/36] incubator-hawq-docs git commit: moving book configuration to
new 'book' branch, for HAWQ-1027
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_partition_encoding.html.md.erb
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+---
+title: pg_partition_encoding
+---
+
+The `pg_partition_encoding` system catalog table describes the available column compression options for a partition template.
+
+<a id="topic1__hb177831"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_attribute\_encoding</span>
+
+| column | type | modifers | storage | description |
+|--------------------|------------|----------|----------|-------------|
+| `parencoid` | oid | not null | plain | � |
+| `parencattnum` | smallint | not null | plain | � |
+| `parencattoptions` | text \[ \] | � | extended | � |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_partition_rule.html.md.erb
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+---
+title: pg_partition_rule
+---
+
+The `pg_partition_rule` system catalog table is used to track partitioned tables, their check constraints, and data containment rules. Each row of `pg_partition_rule` represents either a leaf partition (the bottom level partitions that contain data), or a branch partition (a top or mid-level partition that is used to define the partition hierarchy, but does not contain any data).
+
+<a id="topic1__hc179425"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_partition\_rule</span>
+
+
+| column | type | references | description |
+|---------------------|----------|----------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `paroid` | oid | pg\_partition.oid | Row identifier of the partitioning level (from [pg\_partition](pg_partition.html#topic1)) to which this partition belongs. In the case of a branch partition, the corresponding table (identified by `pg_partition_rule`) is an empty container table. In case of a leaf partition, the table contains the rows for that partition containment rule. |
+| `parchildrelid` | oid | pg\_class.oid | The table identifier of the partition (child table). |
+| `parparentrule` | oid | pg\_partition\_rule.paroid | The row identifier of the rule associated with the parent table of this partition. |
+| `parname` | name | � | The given name of this partition. |
+| `parisdefault` | boolean | � | Whether or not this partition is a default partition. |
+| `parruleord` | smallint | � | For range partitioned tables, the rank of this partition on this level of the partition hierarchy. |
+| `parrangestartincl` | boolean | � | For range partitioned tables, whether or not the starting value is inclusive. |
+| `parrangeendincl` | boolean | � | For range partitioned tables, whether or not the ending value is inclusive. |
+| `parrangestart` | text | � | For range partitioned tables, the starting value of the range. |
+| `parrangeend` | text | � | For range partitioned tables, the ending value of the range. |
+| `parrangeevery` | text | � | For range partitioned tables, the interval value of the `EVERY` clause. |
+| `parlistvalues` | text | � | For list partitioned tables, the list of values assigned to this partition. |
+| `parreloptions` | text | � | An array describing the storage characteristics of the particular partition. |
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_partition_templates.html.md.erb
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diff --git a/reference/catalog/pg_partition_templates.html.md.erb b/reference/catalog/pg_partition_templates.html.md.erb
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+---
+title: pg_partition_templates
+---
+
+The `pg_partition_templates` system view is used to show the subpartitions that were created using a subpartition template.
+
+<a id="topic1__hd179967"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_partition\_templates</span>
+
+
+| column | type | references | description |
+|---------------------------|----------|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `schemaname` | name | � | The name of the schema the partitioned table is in. |
+| `tablename` | name | � | The table name of the top-level parent table. |
+| `partitionname` | name | � | The name of the subpartition (this is the name to use if referring to the partition in an `ALTER TABLE` command). `NULL` if the partition was not given a name at create time or generated by an `EVERY` clause. |
+| `partitiontype` | text | � | The type of subpartition (range or list). |
+| `partitionlevel` | smallint | � | The level of this subpartition in the hierarchy. |
+| `partitionrank` | bigint | � | For range partitions, the rank of the partition compared to other partitions of the same level. |
+| `partitionposition` | smallint | � | The rule order position of this subpartition. |
+| `partitionlistvalues` | text | � | For list partitions, the list value(s) associated with this subpartition. |
+| `partitionrangestart` | text | � | For range partitions, the start value of this subpartition. |
+| `partitionstartinclusive` | boolean | � | `T` if the start value is included in this subpartition. `F` if it is excluded. |
+| `partitionrangeend` | text | � | For range partitions, the end value of this subpartition. |
+| `partitionendinclusive` | boolean | � | `T` if the end value is included in this subpartition. `F` if it is excluded. |
+| `partitioneveryclause` | text | � | The `EVERY` clause (interval) of this subpartition. |
+| `partitionisdefault` | boolean | � | `T` if this is a default subpartition, otherwise `F`. |
+| `partitionboundary` | text | � | The entire partition specification for this subpartition. |
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_partitions.html.md.erb
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+---
+title: pg_partitions
+---
+
+The `pg_partitions` system view is used to show the structure of a partitioned table.
+
+<a id="topic1__he143898"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_partitions</span>
+
+| column | type | references | description |
+|----------------------------|----------|------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `schemaname` | name | � | The name of the schema the partitioned table is in. |
+| `tablename` | name | � | The name of the top-level parent table. |
+| `partitiontablename` | name | � | The relation name of the partitioned table (this is the table name to use if accessing the partition directly). |
+| `partitionname` | name | � | The name of the partition (this is the name to use if referring to the partition in an `ALTER TABLE` command). `NULL` if the partition was not given a name at create time or generated by an `EVERY` clause. |
+| `parentpartitiontablename` | name | � | The relation name of the parent table one level up from this partition. |
+| `parentpartitionname` | name | � | The given name of the parent table one level up from this partition. |
+| `partitiontype` | text | � | The type of partition (range or list). |
+| `partitionlevel` | smallint | � | The level of this partition in the hierarchy. |
+| `partitionrank` | bigint | � | For range partitions, the rank of the partition compared to other partitions of the same level. |
+| `partitionposition` | smallint | � | The rule order position of this partition. |
+| `partitionlistvalues` | text | � | For list partitions, the list value(s) associated with this partition. |
+| `partitionrangestart` | text | � | For range partitions, the start value of this partition. |
+| `partitionstartinclusive` | boolean | � | `T` if the start value is included in this partition. `F` if it is excluded. |
+| `partitionrangeend` | text | � | For range partitions, the end value of this partition. |
+| `partitionendinclusive` | boolean | � | `T` if the end value is included in this partition. `F` if it is excluded. |
+| `partitioneveryclause` | text | � | The `EVERY` clause (interval) of this partition. |
+| `partitionisdefault` | boolean | � | `T` if this is a default partition, otherwise `F`. |
+| `partitionboundary` | text | � | The entire partition specification for this partition. |
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_pltemplate.html.md.erb
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diff --git a/reference/catalog/pg_pltemplate.html.md.erb b/reference/catalog/pg_pltemplate.html.md.erb
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+---
+title: pg_pltemplate
+---
+
+The `pg_pltemplate` system catalog table stores template information for procedural languages. A template for a language allows the language to be created in a particular database by a simple `CREATE LANGUAGE` command, with no need to specify implementation details. Unlike most system catalogs, `pg_pltemplate` is shared across all databases of HAWQ system: there is only one copy of `pg_pltemplate` per system, not one per database. This allows the information to be accessible in each database as it is needed.
+
+There are not currently any commands that manipulate procedural language templates; to change the built-in information, a superuser must modify the table using ordinary `INSERT`, `DELETE`, or `UPDATE` commands.
+
+<a id="topic1__hf150092"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_pltemplate</span>
+
+| column | type | references | description |
+|------------------|-------------|------------|-------------------------------------------------------|
+| `tmplname` | name | � | Name of the language this template is for |
+| `tmpltrusted` | boolean | � | True if language is considered trusted |
+| `tmplhandler` | text | � | Name of call handler function |
+| `tmplvalidator ` | text | � | Name of validator function, or NULL if none |
+| `tmpllibrary` | text | � | Path of shared library that implements language |
+| `tmplacl` | aclitem\[\] | � | Access privileges for template (not yet implemented). |
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_proc.html.md.erb
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diff --git a/reference/catalog/pg_proc.html.md.erb b/reference/catalog/pg_proc.html.md.erb
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+---
+title: pg_proc
+---
+
+The `pg_proc` system catalog table stores information about functions (or procedures), both built-in functions and those defined by `CREATE FUNCTION`. The table contains data for aggregate and window functions as well as plain functions. If `proisagg` is true, there should be a matching row in `pg_aggregate`. If `proiswin` is true, there should be a matching row in `pg_window`.
+
+For compiled functions, both built-in and dynamically loaded, `prosrc` contains the function's C-language name (link symbol). For all other currently-known language types, `prosrc` contains the function's source text. `probin` is unused except for dynamically-loaded C functions, for which it gives the name of the shared library file containing the function.
+
+<a id="topic1__hg150092"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_proc</span>
+
+| column | type | references | description |
+|------------------|-------------|-------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `proname` | name | � | Name of the function. |
+| `pronamespace` | oid | pg\_namespace.oid | The OID of the namespace that contains this function. |
+| `proowner` | oid | pg\_authid.oid | Owner of the function. |
+| `prolang` | oid | pg\_language.oid | Implementation language or call interface of this function. |
+| `proisagg` | boolean | � | Function is an aggregate function. |
+| `prosecdef` | boolean | � | Function is a security definer (for example, a 'setuid' function). |
+| `proisstrict` | boolean | � | Function returns NULL if any call argument is NULL. In that case the function will not actually be called at all. Functions that are not strict must be prepared to handle NULL inputs. |
+| `proretset` | boolean | � | Function returns a set (multiple values of the specified data type). |
+| `provolatile` | char | � | Tells whether the function's result depends only on its input arguments, or is affected by outside factors. `i` = *immutable* (always delivers the same result for the same inputs), `s` = *stable* (results (for fixed inputs) do not change within a scan), or `v` = *volatile* (results may change at any time or functions with side-effects). |
+| `pronargs` | smallint | � | Number of arguments. |
+| `prorettype` | oid | pg\_type.oid | Data type of the return value. |
+| `proiswin` | boolean | � | Function is neither an aggregate nor a scalar function, but a pure window function. |
+| `proargtypes` | oidvector | pg\_type.oid | An array with the data types of the function arguments. This includes only input arguments (including `INOUT` arguments), and thus represents the call signature of the function. |
+| `proallargtypes` | oid\[\] | pg\_type.oid | An array with the data types of the function arguments. This includes all arguments (including `OUT` and `INOUT` arguments); however, if all the arguments are `IN` arguments, this field will be null. Note that subscripting is 1-based, whereas for historical reasons proargtypes is subscripted from 0. |
+| `proargmodes` | char\[\] | � | An array with the modes of the function arguments: `i` = `IN`, `o` = `OUT` , `b` = `INOUT`. If all the arguments are IN arguments, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes. |
+| `proargnames` | text\[\] | � | An array with the names of the function arguments. Arguments without a name are set to empty strings in the array. If none of the arguments have a name, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes. |
+| `prosrc ` | text | � | This tells the function handler how to invoke the function. It might be the actual source code of the function for interpreted languages, a link symbol, a file name, or just about anything else, depending on the implementation language/call convention. |
+| `probin` | bytea | � | Additional information about how to invoke the function. Again, the interpretation is language-specific. |
+| `proacl` | aclitem\[\] | � | Access privileges for the function as given by `GRANT`/`REVOKE`. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_resqueue.html.md.erb
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diff --git a/reference/catalog/pg_resqueue.html.md.erb b/reference/catalog/pg_resqueue.html.md.erb
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+---
+title: pg_resqueue
+---
+
+The `pg_resqueue` system catalog table contains information about HAWQ resource queues, which are used for managing resources. This table is populated only on the master. This table is defined in the `pg_global` tablespace, meaning it is globally shared across all databases in the system.
+
+<a id="topic1__hi141982"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_resqueue</span>
+
+| column | type | references | description |
+|-------------------------|--------------------------|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `rsqname` | name | � | The name of the resource queue. |
+| `parentoid` | oid | � | OID of the parent queue of the resource queue. |
+| `activestats` | integer | � | The maximum number of parallel active statements allowed for the resource queue. |
+| `memorylimit` | text | � | The maximum amount of memory that can be consumed by the resource queue (expressed as a percentage of the cluster's memory.) |
+| `corelimit` | text | � | The maximum amount of cores that can be consumed by the resource queue (expressed as a percentage of the cluster's cores.) |
+| `resovercommit` | real | � | The ratio of resource consumption overcommit for the resource queue. |
+| `allocpolicy` | text | � | The resource allocation policy name for the resource queue. |
+| `vsegresourcequota` | text | � | The virtual segment resource quota for the resource queue. |
+| `nvsegupperlimit` | integer | � | The upper limit of number of virtual segments allowed for one statement execution. |
+| `nvseglowerlimit` | integer | � | The lower limit of number of virtual segments allowed for one statement execution. |
+| `nvsegupperlimitperseg` | real | � | The upper limit of number of virtual segments allowed for one statement execution. The limit is averaged by the number of segments in the cluster. |
+| `nvseglowerlimitperseg` | real | � | The lower limit of number of virtual segments aloowed for one statement execution. The limit is averaged by the number of segments in the cluster. |
+| `creationtime` | timestamp with time zone | � | Time when the resource queue was created. |
+| `updatetime` | timestamp with time zone | � | Time when the resource queue was last changed. |
+| `status` | text | � | Current status of the resource queue.Possible values are `branch`, which indicates a branch resource queue (has children), and `NULL`, which indicates a leaf-level queue (no children). |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_resqueue_status.html.md.erb
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+---
+title: pg_resqueue_status
+---
+
+The `pg_resqueue_status` view allows administrators to see status and activity for a workload management resource queue. It shows how many queries are waiting to run and how many queries are currently active in the system from a particular resource queue.
+
+<a id="topic1__fp141982"></a>
+<span class="tablecap">Table 1. pg\_resqueue\_status</span>
+
+<table>
+<colgroup>
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+</colgroup>
+<thead>
+<tr class="header">
+<th>column</th>
+<th>type</th>
+<th>references</th>
+<th>description</th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td><code class="ph codeph">rsqname</code></td>
+<td>name</td>
+<td>pg_resqueue_ rsqname</td>
+<td>The name of the resource queue.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">segmem</code></td>
+<td>text</td>
+<td>�</td>
+<td>The calculated virtual segment memory resource quota.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">segcore</code></td>
+<td>text</td>
+<td>�</td>
+<td>The calculated virtual segment core resource quota.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">segsize</code></td>
+<td>text</td>
+<td>�</td>
+<td>The number of virtual segments that can be allocated to the resource queue.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">segsizemax</code></td>
+<td>text</td>
+<td>�</td>
+<td>The maximum number of virtual segments that can be allocated to the resource queue.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">inusemem</code></td>
+<td>text</td>
+<td>�</td>
+<td>Aggregated in-use memory by running statements.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">inusecore</code></td>
+<td>text</td>
+<td>�</td>
+<td>Aggregated in-use core by running statements.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">rsqholders</code></td>
+<td>text</td>
+<td>�</td>
+<td>The number of resource holders for running statements. A resource holder is a running statement whose allocated resources from the resource manager has not been returned yet., In other words, the statement holds some resources allocated from the resource manager.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">resqwaiters</code></td>
+<td>text</td>
+<td>�</td>
+<td>The number of resource requests that are queued and waiting for the resource.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">paused</code></td>
+<td>text</td>
+<td>�</td>
+<td>The dynamic pause status of the resource queue. There are three possible statuses:
+<ul>
+<li><code class="ph codeph">T</code> : Queue is paused for the allocation of resources to queued and incoming requests.</li>
+<li><code class="ph codeph">F</code> : Queue is in a normal working status.</li>
+<li><code class="ph codeph">R</code> : Queue is paused and may have encountered resource fragmentation.</li>
+</ul></td>
+</tr>
+</tbody>
+</table>
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_rewrite.html.md.erb
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diff --git a/reference/catalog/pg_rewrite.html.md.erb b/reference/catalog/pg_rewrite.html.md.erb
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+---
+title: pg_rewrite
+---
+
+The `pg_rewrite` system catalog table stores rewrite rules for tables and views. `pg_class.relhasrules` must be true if a table has any rules in this catalog.
+
+<a id="topic1__hm149830"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_rewrite</span>
+
+| column | type | references | description |
+|--------------|----------|---------------|---------------------------------------------------------------------------------------------------------|
+| `rulename` | name | � | Rule name. |
+| `ev_class` | oid | pg\_class.oid | The table this rule is for. |
+| `ev_attr` | smallint | � | The column this rule is for (currently, always zero to indicate the whole table). |
+| `ev_type ` | char | � | Event type that the rule is for: 1 = SELECT, 2 = UPDATE, 3 = INSERT, 4 = DELETE. |
+| `is_instead` | boolean | � | True if the rule is an INSTEAD rule. |
+| `ev_qual` | text | � | Expression tree (in the form of a `nodeToString()` representation) for the rule's qualifying condition. |
+| `ev_action` | text | � | Query tree (in the form of a `nodeToString()` representation) for the rule's action. |
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_roles.html.md.erb
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diff --git a/reference/catalog/pg_roles.html.md.erb b/reference/catalog/pg_roles.html.md.erb
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+---
+title: pg_roles
+---
+
+The view `pg_roles` provides access to information about database roles. This is simply a publicly readable view of [pg\_authid](pg_authid.html#topic1) that blanks out the password field. This view explicitly exposes the OID column of the underlying table, since that is needed to do joins to other catalogs.
+
+<a id="topic1__hn141982"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_roles</span>
+
+| column | type | references | description |
+|---------------------|--------------------------|------------------|---------------------------------------------------------------------------------------------------------------------|
+| `rolname` | name | � | Role name |
+| `rolsuper` | boolean | � | Role has superuser privileges |
+| `rolinherit` | boolean | � | Role automatically inherits privileges of roles it is a member of |
+| `rolcreaterole` | boolean | � | Role may create more roles |
+| `rolcreatedb` | boolean | � | Role may create databases |
+| `rolcatupdate` | boolean | � | Role may update system catalogs directly. (Even a superuser may not do this unless this column is true.) |
+| `rolcanlogin` | boolean | � | Role may log in. That is, this role can be given as the initial session authorization identifier |
+| `rolconnlimit` | integer | � | For roles that can log in, this sets maximum number of concurrent connections this role can make. -1 means no limit |
+| `rolpassword` | text | � | Not the password (always reads as \*\*\*\*\*\*\*\*) |
+| `rolvaliduntil ` | timestamp with time zone | � | Password expiry time (only used for password authentication); NULL if no expiration |
+| `rolconfig ` | text\[\] | � | Session defaults for run-time configuration variables |
+| ` rolresqueue` | oid | pg\_resqueue.oid | Object ID of the resource queue this role is assigned to. |
+| `oid` | oid | pg\_authid.oid | Object ID of role |
+| `rolcreaterextgpfd` | boolean | � | Role may create readable external tables that use the gpfdist protocol. |
+| `rolcreaterexthttp` | boolean | � | Role may create readable external tables that use the http protocol. |
+| `rolcreatewextgpfd` | boolean | � | Role may create writable external tables that use the gpfdist protocol. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_shdepend.html.md.erb
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+---
+title: pg_shdepend
+---
+
+The `pg_shdepend` system catalog table records the dependency relationships between database objects and shared objects, such as roles. This information allows HAWQ to ensure that those objects are unreferenced before attempting to delete them. See also [pg\_depend](pg_depend.html#topic1), which performs a similar function for dependencies involving objects within a single database. Unlike most system catalogs, `pg_shdepend` is shared across all databases of HAWQ system: there is only one copy of `pg_shdepend` per system, not one per database.
+
+In all cases, a `pg_shdepend` entry indicates that the referenced object may not be dropped without also dropping the dependent object. However, there are several subflavors identified by `deptype`:
+
+- **SHARED\_DEPENDENCY\_OWNER (o)** \u2014 The referenced object (which must be a role) is the owner of the dependent object.
+- **SHARED\_DEPENDENCY\_ACL (a)** \u2014 The referenced object (which must be a role) is mentioned in the ACL (access control list) of the dependent object.
+- **SHARED\_DEPENDENCY\_PIN (p)** \u2014 There is no dependent object; this type of entry is a signal that the system itself depends on the referenced object, and so that object must never be deleted. Entries of this type are created only by system initialization. The columns for the dependent object contain zeroes. <a id="topic1__ho143898"></a>
+
+<span class="tablecap">Table 1. pg\_catalog.pg\_shdepend</span>
+
+| column | type | references | description |
+|----------------|---------|------------------|------------------------------------------------------------------------------------------------------------|
+| `dbid` | oid | pg\_database.oid | The OID of the database the dependent object is in, or zero for a shared object. |
+| `classid` | oid | pg\_class.oid | The OID of the system catalog the dependent object is in. |
+| `objid` | oid | any OID column | The OID of the specific dependent object. |
+| `objsubid ` | integer | � | For a table column, this is the column number. For all other object types, this column is zero. |
+| `refclassid` | oid | pg\_class.oid | The OID of the system catalog the referenced object is in (must be a shared catalog). |
+| `refobjid` | oid | any OID column | The OID of the specific referenced object. |
+| `refobjsubid ` | integer | � | For a table column, this is the referenced column number. For all other object types, this column is zero. |
+| `deptype` | char | � | A code defining the specific semantics of this dependency relationship. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_shdescription.html.md.erb
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diff --git a/reference/catalog/pg_shdescription.html.md.erb b/reference/catalog/pg_shdescription.html.md.erb
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+---
+title: pg_shdescription
+---
+
+The `pg_shdescription` system catalog table stores optional descriptions (comments) for shared database objects. Descriptions can be manipulated with the `COMMENT` command and viewed with `psql`'s `\d` meta-commands. See also [pg\_description](pg_description.html#topic1), which performs a similar function for descriptions involving objects within a single database. Unlike most system catalogs, `pg_shdescription` is shared across all databases of a HAWQ system: there is only one copy of `pg_shdescription` per system, not one per database.
+
+<a id="topic1__hp143898"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_shdescription</span>
+
+
+| column | type | references | description |
+|---------------|------|----------------|---------------------------------------------------------------|
+| `objoid` | oid | any OID column | The OID of the object this description pertains to. |
+| `classoid` | oid | pg\_class.oid | The OID of the system catalog this object appears in |
+| `description` | text | � | Arbitrary text that serves as the description of this object. |
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stat_activity.html.md.erb
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diff --git a/reference/catalog/pg_stat_activity.html.md.erb b/reference/catalog/pg_stat_activity.html.md.erb
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+---
+title: pg_stat_activity
+---
+
+The view `pg_stat_activity` shows one row per server process and details about it associated user session and query. The columns that report data on the current query are available unless the parameter `stats_command_string` has been turned off. Furthermore, these columns are only visible if the user examining the view is a superuser or the same as the user owning the process being reported on.
+
+<a id="topic1__hq141982"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_stat\_activity</span>
+
+| column | type | references | description |
+|--------------------|--------------------------|------------------|---------------------------------------------------------------|
+| `datid` | oid | pg\_database.oid | Database OID |
+| `datname` | name | � | Database name |
+| `procpid` | integer | � | Process ID of the server process |
+| `sess_id` | integer | � | Session ID |
+| `usesysid` | oid | pg\_authid.oid | Role OID |
+| `usename` | name | � | Role name |
+| `current_query` | text | � | Current query that process is running |
+| `waiting` | boolean | � | True if waiting on a lock, false if not waiting |
+| `query_start` | timestamp with time zone | � | Time query began execution |
+| `backend_start` | timestamp with time zone | � | Time backend process was started |
+| `client_addr` | inet | � | Client address |
+| `client_port` | integer | � | Client port |
+| `application_name` | text | � | Client application name |
+| `xact_start` | timestamp with time zone | � | Transaction start time |
+| `waiting_resource` | boolean | � | True if waiting for resource allocation, false if not waiting |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stat_last_operation.html.md.erb
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diff --git a/reference/catalog/pg_stat_last_operation.html.md.erb b/reference/catalog/pg_stat_last_operation.html.md.erb
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+---
+title: pg_stat_last_operation
+---
+
+The pg\_stat\_last\_operation table contains metadata tracking information about database objects (tables, views, etc.).
+
+<a id="topic1__hr138428"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_stat\_last\_operation</span>
+
+| column | type | references | description |
+|-----------------|-------------------------|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `classid` | oid | pg\_class.oid | OID of the system catalog containing the object. |
+| `objid` | oid | any OID column | OID of the object within its system catalog. |
+| `staactionname` | name | � | The action that was taken on the object. |
+| `stasysid` | oid | pg\_authid.oid | A foreign key to pg\_authid.oid. |
+| `stausename` | name | � | The name of the role that performed the operation on this object. |
+| `stasubtype` | text | � | The type of object operated on or the subclass of operation performed. |
+| `statime` | timestamp with timezone | � | The timestamp of the operation. This is the same timestamp that is written to the HAWQ server log files in case you need to look up more detailed information about the operation in the logs. |
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stat_last_shoperation.html.md.erb
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+---
+title: pg_stat_last_shoperation
+---
+
+The pg\_stat\_last\_shoperation table contains metadata tracking information about global objects (roles, tablespaces, etc.).
+
+<a id="topic1__hs138428"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_stat\_last\_shoperation</span>
+
+
+| column | type | references | description |
+|-----------------|-------------------------|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| classid | oid | pg\_class.oid | OID of the system catalog containing the object. |
+| `objid` | oid | any OID column | OID of the object within its system catalog. |
+| `staactionname` | name | � | The action that was taken on the object. |
+| `stasysid` | oid | � | � |
+| `stausename` | name | � | The name of the role that performed the operation on this object. |
+| `stasubtype` | text | � | The type of object operated on or the subclass of operation performed. |
+| `statime` | timestamp with timezone | � | The timestamp of the operation. This is the same timestamp that is written to the HAWQ server log files in case you need to look up more detailed information about the operation in the logs. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stat_operations.html.md.erb
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diff --git a/reference/catalog/pg_stat_operations.html.md.erb b/reference/catalog/pg_stat_operations.html.md.erb
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+---
+title: pg_stat_operations
+---
+
+The view `pg_stat_operations` shows details about the last operation performed on a database object (such as a table, index, view or database) or a global object (such as a role).
+
+<a id="topic1__ht141982"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_stat\_operations</span>
+
+
+<table>
+<colgroup>
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+</colgroup>
+<thead>
+<tr class="header">
+<th>column</th>
+<th>type</th>
+<th>references</th>
+<th>description</th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td><code class="ph codeph">classname</code></td>
+<td>text</td>
+<td>�</td>
+<td>The name of the system table in the <code class="ph codeph">pg_catalog</code> schema where the record about this object is stored (<code class="ph codeph">pg_class</code>=relations, <code class="ph codeph">pg_database</code>=databases,
+<p><code class="ph codeph">pg_namespace</code>=schemas,</p>
+<p><code class="ph codeph">pg_authid</code>=roles)</p></td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">objname</code></td>
+<td>name</td>
+<td>�</td>
+<td>The name of the object.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">objid</code></td>
+<td>oid</td>
+<td>�</td>
+<td>The OID of the object.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">schemaname</code></td>
+<td>name</td>
+<td>�</td>
+<td>The name of the schema where the object resides.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">usestatus</code></td>
+<td>text</td>
+<td>�</td>
+<td>The status of the role who performed the last operation on the object (<code class="ph codeph">CURRENT</code>=a currently active role in the system, <code class="ph codeph">DROPPED</code>=a role that no longer exists in the system, <code class="ph codeph">CHANGED</code>=a role name that exists in the system, but has changed since the last operation was performed).</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">usename</code></td>
+<td>name</td>
+<td>�</td>
+<td>The name of the role that performed the operation on this object.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">actionname</code></td>
+<td>name</td>
+<td>�</td>
+<td>The action that was taken on the object.</td>
+</tr>
+<tr class="even">
+<td><code class="ph codeph">subtype</code></td>
+<td>text</td>
+<td>�</td>
+<td>The type of object operated on or the subclass of operation performed.</td>
+</tr>
+<tr class="odd">
+<td><code class="ph codeph">statime</code></td>
+<td>timestamp with time zone</td>
+<td>�</td>
+<td>The timestamp of the operation. This is the same timestamp that is written to the HAWQ server log files in case you need to look up more detailed information about the operation in the logs.</td>
+</tr>
+</tbody>
+</table>
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stat_partition_operations.html.md.erb
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diff --git a/reference/catalog/pg_stat_partition_operations.html.md.erb b/reference/catalog/pg_stat_partition_operations.html.md.erb
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+---
+title: pg_stat_partition_operations
+---
+
+The `pg_stat_partition_operations` view shows details about the last operation performed on a partitioned table.
+
+<a id="topic1__hu141982"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_stat\_partition\_operations</span>
+
+| column | type | references | description |
+|--------------------|--------------------------|------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `classname` | text | � | The name of the system table in the `pg_catalog` schema where the record about this object is stored (always `pg_class` for tables and partitions). |
+| `objname` | name | � | The name of the object. |
+| `objid` | oid | � | The OID of the object. |
+| `schemaname` | name | � | The name of the schema where the object resides. |
+| `usestatus` | text | � | The status of the role who performed the last operation on the object (`CURRENT`=a currently active role in the system, `DROPPED`=a role that no longer exists in the system, `CHANGED`=a role name that exists in the system, but its definition has changed since the last operation was performed). |
+| `usename` | name | � | The name of the role that performed the operation on this object. |
+| `actionname` | name | � | The action that was taken on the object. |
+| `subtype` | text | � | The type of object operated on or the subclass of operation performed. |
+| `statime` | timestamp with time zone | � | The timestamp of the operation. This is the same timestamp that is written to the HAWQ server log files in case you need to look up more detailed information about the operation in the logs. |
+| `partitionlevel` | smallint | � | The level of this partition in the hierarchy. |
+| `parenttablename` | name | � | The relation name of the parent table one level up from this partition. |
+| `parentschemaname` | name | � | The name of the schema where the parent table resides. |
+| `parent_relid` | oid | � | The OID of the parent table one level up from this partition. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_statistic.html.md.erb
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diff --git a/reference/catalog/pg_statistic.html.md.erb b/reference/catalog/pg_statistic.html.md.erb
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+---
+title: pg_statistic
+---
+
+The `pg_statistic` system catalog table stores statistical data about the contents of the database. Entries are created by `ANALYZE` and subsequently used by the query optimizer. There is one entry for each table column that has been analyzed. Note that all the statistical data is inherently approximate, even assuming that it is up-to-date.
+
+`pg_statistic` also stores statistical data about the values of index expressions. These are described as if they were actual data columns; in particular, `starelid` references the index. No entry is made for an ordinary non-expression index column, however, since it would be redundant with the entry for the underlying table column.
+
+Since different kinds of statistics may be appropriate for different kinds of data, `pg_statistic` is designed not to assume very much about what sort of statistics it stores. Only extremely general statistics (such as nullness) are given dedicated columns in `pg_statistic`. Everything else is stored in slots, which are groups of associated columns whose content is identified by a code number in one of the slot's columns.
+
+`pg_statistic` should not be readable by the public, since even statistical information about a table's contents may be considered sensitive (for example: minimum and maximum values of a salary column). `pg_stats` is a publicly readable view on `pg_statistic` that only exposes information about those tables that are readable by the current user. See [pg\_stats](pg_stats.html#topic1), for more information on this view.
+
+<a id="topic1__hv156260"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_statistic</span>
+
+| column | type | references | description |
+|---------------|----------|----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `starelid` | oid | pg\_class.oid | The table or index that the described column belongs to. |
+| `staattnum` | smallint | pg\_attribute.attnum | The number of the described column. |
+| `stanullfrac` | real | � | The fraction of the column's entries that are null. |
+| `stawidth` | integer | � | The average stored width, in bytes, of nonnull entries. |
+| `stadistinct` | real | � | The number of distinct nonnull data values in the column. A value greater than zero is the actual number of distinct values. A value less than zero is the negative of a fraction of the number of rows in the table (for example, a column in which values appear about twice on the average could be represented by `stadistinct` = -0.5). A zero value means the number of distinct values is unknown. |
+| `stakindN` | smallint | � | A code number indicating the kind of statistics stored in the `N`th slot of the `pg_statistic` row. |
+| `staopN` | oid | pg\_operator.oid | An operator used to derive the statistics stored in the `N`th slot. For example, a histogram slot would show the `<` operator that defines the sort order of the data. |
+| `stanumbersN` | real\[\] | � | Numerical statistics of the appropriate kind for the `N`th slot, or NULL if the slot kind does not involve numerical values. |
+| `stavaluesN` | anyarray | � | Column data values of the appropriate kind for the `N`th slot, or NULL if the slot kind does not store any data values. Each array's element values are actually of the specific column's data type, so there is no way to define these columns' type more specifically than `anyarray`. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_stats.html.md.erb
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diff --git a/reference/catalog/pg_stats.html.md.erb b/reference/catalog/pg_stats.html.md.erb
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+---
+title: pg_stats
+---
+
+The `pg_stats` is a publicly readable view on `pg_statistic` that only exposes information about those tables that are readable by the current user. All the statistical data is inherently approximate, even assuming that it is up-to-date.The `pg_stats` view presents the contents of `pg_statistic` in a friendlier format.
+
+All the statistical data is inherently approximate, even assuming that it is up-to-date.The `pg_stats` schema must be extended whenever new slot types are defined.
+
+<a id="topic1__table_ckx_t2w_jv"></a>
+<span class="tablecap">Table 1. pg\_stats</span>
+
+| Name | Type | References | Description |
+|---------------------|----------|----------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| schemaname | name | [pg\_namespace](pg_namespace.html#topic1).nspname. | The name of the schema containing the table. |
+| tablename | name | [pg\_class](pg_class.html#topic1).relname | The name of the table. |
+| attname | name | [pg\_attribute](pg_attribute.html#topic1).attname | The name of the column this row describes. |
+| null\_frac | real | � | The fraction of column entries that are null. |
+| avg\_width | integer | � | The average storage width in bytes of the column's entries, calculated as `avg(pg_column_size(column_name))`. |
+| n\_distinct | real | � | A positive number is an estimate of the number of distinct values in the column; the number is not expected to vary with the number of rows. A negative value is the number of distinct values divided by the number of rows, that is, the ratio of rows with distinct values for the column, negated. This form is used when the number of distinct values increases with the number of rows. A unique column, for example, has an `n_distinct` value of -1.0. Columns with an average width greater than 1024 are considered unique. |
+| most\_common-vals | anyarray | � | An array containing the most common values in the column, or null if no values seem to be more common. If the `n_distinct` column is -1, `most_common_vals` is null. The length of the array is the lesser of the number of actual distinct column values or the value of the `default_statistics_target` configuration parameter. The number of values can be overridden for a column using `ALTER TABLE table SET COLUMN column SET STATISTICS N`. |
+| most\_common\_freqs | real\[\] | � | An array containing the frequencies of the values in the `most_common_vals` array. This is the number of occurrences of the value divided by the total number of rows. The array is the same length as the `most_common_vals` array. It is null if `most_common_vals` is null. |
+| histogram\_bounds | anyarray | � | An array of values that divide the column values into groups of approximately the same size. A histogram can be defined only if there is a `max()` aggregate function for the column. The number of groups in the histogram is the same as the `most_common_vals` array size. |
+| correlation | real | � | HAWQ does not calculate the correlation statistic. |
+
+
+
+
http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/blob/7514e193/reference/catalog/pg_tablespace.html.md.erb
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diff --git a/reference/catalog/pg_tablespace.html.md.erb b/reference/catalog/pg_tablespace.html.md.erb
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+---
+title: pg_tablespace
+---
+
+The `pg_tablespace` system catalog table stores information about the available tablespaces. Tables can be placed in particular tablespaces to aid administration of disk layout. Unlike most system catalogs, `pg_tablespace` is shared across all databases of a HAWQ system: there is only one copy of `pg_tablespace` per system, not one per database.
+
+<a id="topic1__hx156260"></a>
+<span class="tablecap">Table 1. pg\_catalog.pg\_tablespace</span>
+
+| column | type | references | description |
+|-------------------|-------------|-------------------|-----------------------------------------------------------------------------------------------------------------------------|
+| `spcname` | name | � | Tablespace name. |
+| `spcowner` | oid | pg\_authid.oid | Owner of the tablespace, usually the user who created it. |
+| `spclocation` | text\[\] | � | Deprecated. |
+| `spcacl ` | aclitem\[\] | � | Tablespace access privileges. |
+| `spcprilocations` | text\[\] | � | Deprecated. |
+| `spcmrilocations` | text\[\] | � | Deprecated. |
+| `spcfsoid` | oid | pg\_filespace.oid | The object id of the filespace used by this tablespace. A filespace defines directory locations on the master and segments. |
+
+
+
+