15 lines
959 B
Markdown
15 lines
959 B
Markdown
# Slow Cache Command
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Slow Cache command are sensitive for you to identify bottlenecks of a system which relies on cache system.
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Slow Cache command are based on sampling. Right now, the core samples are the top 50 slowest every 10 minutes.
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Note that the duration of these command must be slower than the threshold.
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Here's the format of the settings (in milliseconds):
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> cache-type:thresholdValue,cache-type2:thresholdValue2
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The default settings are `default:20,redis:10`. `Reserved Cache type` is **default**, which is the default threshold for all
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cache types, unless set explicitly.
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**Note**:
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1. The threshold should not be set too small, like `1ms`. Although it works in theory, OAP performance issues may arise if your system statement access time is usually more than 1ms.
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2. The OAP server would run statistic per service and only persistent the top 50 every 10(controlled by `topNReportPeriod: ${SW_CORE_TOPN_REPORT_PERIOD:10}`) minutes by default. |