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Tuning Oracle to minimize Crash Recovery time

Sun Microsystems has published an online whitepaper titled “Tuning ORACLE to Minimize Recovery Time: For Solaris Operating System on SPARC” by Jim Mauro, a Senior Staff Engineer in Sun's Performance and Availability Engineering group.  His paper focuses on tuning Oracle for fast recovery:

The paper includes these main areas for speeding=up Oracle crash recovery:

1.      Background

2.      Availability

3.      Recovery

4.      ORACLE Cache Recovery Tuning

5.      Recovery and Performance Measurements

6.      Best Practices

Under best practices we see conclusions about tuning Oracle crash recovery time:

Our findings are summarized as follows:

  • The impact of tuning for recovery is substantially minimized in later releases of ORACLE, specifically ORACLE 9.2.
  • In the ORACLE 8 tests, we used hard ("brute-force") checkpointing, and were able to reduce recovery significantly, from about 27 minutes to about 4 minutes, but that came at a application performance regression of 28%.
  • Some quick tests done with incremental checkpointing in ORACLE 8.1.7 yielded better recovery times, down to 72 seconds, but caused a 26% application performance reduction.
  • We purposely used a system that was I/O-constrained, which predictably resulted in a negative performance impact.
  • Initial tests with ORACLE 9 on the smaller system (system A) demonstrated excellent recovery times (under 2 minutes) with a minimal performance impact (less than 5%). We addressed the I/O configuration that constrained the ORACLE 8 tests through the use of more disks.
  • The larger system (System B) with ORACLE 9 demonstrated effective use of fast_start_mttr_target with parallel_execution_message_size and recovery_parallelism. Without tuning fast start, going from serial recovery (no parallelism) to 24 recovery processes and increasing the message buffer size from the default of 2 kilobytes to 4 kilobytes yielded a 40% improvement in recovery time (from about 44 minutes to 26 minutes). Further gains were measured by increasing the message buffer size to 16 kilobytes, where recovery dropped to 22 minutes.
  • Using fast_start_mttr_target with message buffer tuning and multiple recovery processes resulted in achieving recovery times within the MTTR setting.


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