Optimize MV invalidation overhead using reference counting. #1029
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weinan003
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Apr 1, 2025
yjhjstz
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Apr 1, 2025
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LGTM, except CI |
This commit optimizes the materialized view (MV) invalidation mechanism to reduce overhead in OLTP workloads. The AQUMV feature introduced `SetRelativeMatviewAuxStatus()` to invalidate MVs at appropriate times, which GP7 lacks. However, TPC-B testing showed this function adds ~8.72% OLTP overhead due to mandatory metadata operations, even when no MVs are present. To address this, we added `relmvrefcount` to track the number of MVs dependent on a table. When no MVs reference a table, the system now skips `SetRelativeMatviewAuxStatus()` entirely, avoiding unnecessary catalog access. Benchmark results demonstrate significant improvements: under 20 concurrent connections, transactions increased from 373,511 to 404,976, latency decreased from 16.06ms to 14.813ms, and TPS improved from 1,245.3 to 1,350.2. This optimization restores performance parity with GP7 in MV-free scenarios while maintaining correctness for tables with MVs, delivering measurable throughput gains and reduced latency in high-concurrency OLTP workloads. Authored-by: Zhang Mingli [email protected]
yjhjstz
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Apr 3, 2025
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This commit optimizes the materialized view (MV) invalidation mechanism to reduce overhead in OLTP workloads. The AQUMV feature introduced
SetRelativeMatviewAuxStatus()to invalidate MVs at appropriate times, which GP7 lacks. However, TPC-B testing showed this function adds ~8.72% OLTP overhead due to mandatory metadata operations, even when no MVs are present.To address this, we added
relmvrefcountto track the number of MVs dependent on a table. When no MVs reference a table, the system now skipsSetRelativeMatviewAuxStatus()entirely, avoiding unnecessary catalog access. Benchmark results demonstrate significant improvements: under 20 concurrent connections, transactions increased from 373,511 to 404,976, latency decreased from 16.06ms to 14.813ms, and TPS improved from 1,245.3 to 1,350.2.This optimization restores performance parity with GP7 in MV-free scenarios while maintaining correctness for tables with MVs, delivering measurable throughput gains and reduced latency in high-concurrency OLTP workloads.
Authored-by: Zhang Mingli [email protected]
Fixes #ISSUE_Number
What does this PR do?
Type of Change
Breaking Changes
Test Plan
make installcheckmake -C src/test installcheck-cbdb-parallelImpact
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User-facing changes:
Dependencies:
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