Top 5 Database and/or Instance Performance Issues in RAC Environment
(Doc ID 1373500.1)
Last updated on MAY 26, 2020
Applies to:Oracle Database - Enterprise Edition - Version 10.1.0.2 to 126.96.36.199 [Release 10.1 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database 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.
The purpose of this document is to provide a summary of top database and/or instance performance issues and the possible solutions in a RAC environment.
Please note that Issue #3 (High Waits on Mutexes) and Issue #5 (High CPU and Memory Consumption) are generic database issues and not RAC-specific. However, they have been included in this document because they are one of the TOP issues, and can occur locally on an instance in a RAC environment.
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In this Document
|Issue #1: High counts of lost blocks(gc lost blocks, gc current/cr lost blocks)|
|Issue #2: High log file sync waits|
|Issue #3: High Waits on Mutex|
|Issue #4: High gc buffer busy, enq: TX -row lock contention, enq: TX - index contention, enq: TX - ITL allocate entry waits|
|Issue #5: High CPU and memory consumption|