PI99672: REMOVE THE FIRST_ROWS HINT FROM ORACLE V10+ PAGINATION QUERIES

Fixes are available

APAR status

Closed as program error.

Error description

When using Liberty server to use jpa-2.1 feature with Oracle
12i, the OraclePlatform QueryHint FIRST_ROWS does not use
max
parameter, so the generated statement is taking a long time
to
complete, which is very major impact to the user.

Local fix

```
N/A
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty - Java Persistence APA - JPA *
*                  2.1 & EclipseLink                           *
****************************************************************
* PROBLEM DESCRIPTION: EclipseLink adds a deprecated FIRST_ROW *
*                      HINT for Oracle versions 10+, which     *
*                      leads to performance degradation        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When executing a pagination query against Oracle, EclipseLink
generates a query similar to this:

    SELECT * FROM (SELECT /*+ FIRST_ROWS / a., ROWNUM rnum FROM
(SELECT DUMMYID AS a1 FROM dummy) a WHERE ROWNUM <= ?) WHERE
rnum > ? bind => [40, 20]

However, use of the 'FIRST_ROWS' query hint leads to poorer
performance on Oracle versions 10+. The reason for this failure
is due to the EclipseLink binary WebSphere ships with not
containing the 'org.eclipse.persistence.oracle' extension
packages. The fix involves adding EclipseLink database platform
support for Oracle versions 8+ and adding support for
deprecating this 'FIRST_ROWS' hint.

Problem conclusion

The fix for this APAR changes the EclipseLink implementation and
involves an update to the thirdparty source. See
https://bugs.eclipse.org/bugs/show_bug.cgi?id=532160

This fix is currently targeted for WebSphere Application Server
9.0.0.9 and WebSphere Liberty 18.0.0.3.  Please refer to the
Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI99672
Reported component name
WAS LIBERTY COR
Reported component ID
5725L2900
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-06-27
Closed date
2018-09-17
Last modified date
2018-09-17

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
WAS LIBERTY COR
Fixed component ID
5725L2900

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSD28V","label":"WebSphere Application Server Liberty Core"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
18 October 2021

Tips

PI99672: REMOVE THE FIRST_ROWS HINT FROM ORACLE V10+ PAGINATION QUERIES

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

RCD0 PSY

Document Information

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