Slow XML Query Performance When Using TIMESTAMP Datatype In A Nested XML View
(Doc ID 1352763.1)
Last updated on FEBRUARY 20, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.3 to 10.2.0.5.0 [Release 10.2]Information in this document applies to any platform.
Symptoms
In 10.2.0.x, XML query performance is slow when using a TIMESTAMP datatype in a nested XML view table. The explain plan shows "COLLECTION ITERATOR PICKLER FETCH XMLSEQUENCEFROMXMLTYPE" when the performance is slow:
-------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 8168 |287K| 26 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 8168 |287K| 26 (0)| 00:00:01 |
| 2 | VIEW | DETAILED_METADATA | 1 |34 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL | METADATA | 1 | 4265 | 2 (0)| 00:00:01 |
| 4 | COLLECTION ITERATOR PICKLER FETCH| XMLSEQUENCEFROMXMLTYPE | | | | |
-------------------------------------------------------------------------------------------------------------
The same query runs fine when the TIMESTAMP column is removed.
This problem does not occur in 11g.
Cause
To view full details, sign in with your My Oracle Support account. |
|
Don't have a My Oracle Support account? Click to get started! |
In this Document
| Symptoms |
| Cause |
| Solution |
| References |