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Posted to dev@trafodion.apache.org by Rohit Jain <ro...@esgyn.com> on 2015/08/03 22:08:50 UTC
RE: [jira] [Commented] (TRAFODION-1423) Indexes on trafodion should
be created in aligned row format by default
Curious, what were those suggestion :-) Don't see JIRA comments on them.
-----Original Message-----
From: Selvaganesan Govindarajan (JIRA) [mailto:jira@apache.org]
Sent: Monday, August 3, 2015 2:48 PM
To: issues@trafodion.incubator.apache.org
Subject: [jira] [Commented] (TRAFODION-1423) Indexes on trafodion should be
created in aligned row format by default
[
https://issues.apache.org/jira/browse/TRAFODION-1423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652362#comment-14652362
]
Selvaganesan Govindarajan commented on TRAFODION-1423:
------------------------------------------------------
Anoop suggested some more changes. I will push another version incorporating
his suggestions.
> Indexes on trafodion should be created in aligned row format by default
> -----------------------------------------------------------------------
>
> Key: TRAFODION-1423
> URL: https://issues.apache.org/jira/browse/TRAFODION-1423
> Project: Apache Trafodion
> Issue Type: Improvement
> Components: sql-cmp, sql-cmu
> Affects Versions: 2.0-incubating
> Reporter: Selvaganesan Govindarajan
> Assignee: Selvaganesan Govindarajan
>
> Currently indexes are created with the same row format as the table.
> However, indexes can be created in aligned row format independent of the
> table because the columns in the index table doesn't have any other column
> other than salt, index columns, and primary key of the table. These column
> values constitute the rowid. Index rows are always deleted and inserted
> and are never updated. Hence, it goes well to create index in aligned row
> format. In addition, index in aligned row format has the following
> advantages:
> - Reduced storage space for the index
> - Reduced block cache and memstore space at runtime
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