INSTANT CLIENT CAUSES MEMORY LEAK WHEN CONNECTING AC/TAC SERVICE (Doc ID 3076528.1)

Last updated on MARCH 13, 2025

Applies to:

Symptoms

The C program uses Oracle Instant Client to connect to RAC DB through TAC service. The C program and Oracle Instant Client were installed in same OS server.
The application process of the C program has memory increased significantly in short time.
If connecting to RAC DB using non-TAC service, no memory issue was found.

====TAC Service info ===
Service name: TAC1
Server pool:
Cardinality: 2
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: true
Global: false
Commit Outcome: true
Failover type: AUTO              <<<<
Failover method: BASIC
Failover retries: 12
Failover delay: 5
Failover restore: AUTO         <<<Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: THROUGHPUT
TAF policy specification: BASIC

....

Changes

Upgraded Oracle Instant Client from 19.14 to 19.25.

Cause

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