Deadlock On Commit Materialized View
(Doc ID 1312379.1)
Last updated on FEBRUARY 18, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.4 [Release 10.2]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
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A refresh is occurring for a Materialized View with on commit upon ten base tables. Concurrently,
an insert is happening from two processes. The processes hang in a deadlock with the following events:
enq: JI - contention
For example:
| SID |
LMODE |
REQUEST |
Type |
| 153 | 6 | 0 | Blocking |
| 142 | 0 | 6 | Blocked |
| 142 | 6 | 0 | Blocking |
| 153 | 0 | 6 | Blocked |
The problem is occurring while an insert and a select are performing at the same time using a Materialized View.
For example:
a) While select:
Elapsed times include waiting on following events:
| Event waited on | Times Waited | Max. Wait | Total Waited |
| SQL*Net message to client | 1 | 0.00 | 0.00 |
| SQL*Net message from client | 1 | 0.00 | 0.00 |
| enq: JI - contention | 397 | 3.07 | 369.19 |
| db file sequential read | 6 | 0.00 | 0.00 |
b) While insert:
Elapsed times include waiting on following events:
| Event waited on |
Times Waited |
Max. Wait |
Total Waited |
| enq: JI - contention | 1 | 0.52 | 0.52 |
| enq: JI - contention | 397 | 2.93 | 969.19 |
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |