[jira] Updated: (DERBY-737) SYSCS_UTIL.SYSCS_COMPRESS_TABLE should create statistics if they do not exist

["Mike Matrigali (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-737?page=all ]

Mike Matrigali updated DERBY-737:
---------------------------------


I believe your interpretation is correct.  The request is to always "update" statistics when running the compress table command.  Internally this may mean updating a row or creating a new row - the difference need not be documented to the user.  Since the entire index is getting rebuilt, I can think of no reason not to gather the statistics and record them at this time.

> SYSCS_UTIL.SYSCS_COMPRESS_TABLE should create statistics if they do not exist
> -----------------------------------------------------------------------------
>
>                 Key: DERBY-737
>                 URL: http://issues.apache.org/jira/browse/DERBY-737
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.1.1, 10.1.1.2, 10.1.2.0, 10.1.2.1, 10.2.1.6, 10.1.3.0, 10.1.2.2, 10.0.2.2
>            Reporter: Kathey Marsden
>            Priority: Minor
>
> There must be an entry in the SYSSTATISTICS table in order for the cardinality statistics in SYSSTATISTICS to be created with SYSCS_UTIL.SYSCS_COMPRESS_TABLE 
> SYSCS_UTIL.SYSCS_COMPRESS_TABLE  should create statistics if they don't exist.  The only way to create them if the index was created on an empty table, seems to be to drop and recreate the index after the table has been loaded.
> The documentation will also need updating if this change is made.
> http://db.apache.org/derby/docs/10.1/tuning/ctunstats57373.html

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