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http://opensource.atlassian.com/projects/hibernate/browse/HHH-5371?page=c...
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Erik-Berndt Scheper commented on HHH-5371:
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And with regard to the rationale behind this functionality:
Partitioning offers a lot of advantages, including:
* Improved query performance by selectively moving rows to various partitions (or even
purging old rows)
* Faster data loads, index creation, etc.
See for example:
* The Oracle partitioning manual
(
http://download.oracle.com/docs/cd/B10500_01/server.920/a96524/c12parti.htm)
* IBM DB2 400 manual
(
http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/db...)
Without this patch it is _impossible_ to partition audit tables, because a table can only
be partitioned using a column _*inside*_ the table.
I.e. you cannot create a partition based on the join of the end-revision column (of the
audit table) with the timestamp of the revision table.
(even though this technically results in the same value).
Note: the test in the revised patch does verify that the end-revision-timestamp has the
same value as the timestamp of the corresponding row in the revision table.
Add support for REVEND_TSTMP which will enable SQL table partitioning
by time
-----------------------------------------------------------------------------
Key: HHH-5371
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5371
Project: Hibernate Core
Issue Type: New Feature
Components: envers
Affects Versions: 3.6.0.Beta1
Reporter: Matthew B. Jones
Assignee: Adam Warski
Attachments: HHH-5371-revend_tstmp-documentation-20100908.patch,
HHH-5371-revend_tstmp-revised-20100908.patch, revend_tstmp.txt
There is strong desire to be able to purge old records out of a relational database by
using table partitioning. In order to partition a table, you need to partition it on a
column that exists within the table. So, in order to partition the _AUD tables by expired
time, the timestamp of REVEND must be present within the table.
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