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Streams Apply Throughput Affected by WAIT DEPENDENCY Waits (Doc ID 1566466.1)

Last updated on MARCH 04, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 to 11.2.0.3 [Release 11.2]
Oracle Database Cloud Schema 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
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

The apply servers are waiting between ~65%-~85% of the time in "WAIT DEPENDENCY".

It was common to see that only 1 transaction is executing transactions meanwhile other 15 processes are in status "WAIT DEPENDENCY"
Those 15 sessions have as dependent transaction 0.0.0.

Problem is still observed even after applying <Patch 14055108>.

Parallelism is set to 16.

The structure of the tables, etc., is identical between the source site and target site, 

The tables being replicated all have primary keys and also have foreign key relationships to other tables.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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