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Dec 9, 2024
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Announce GA of memory control on stats cache (#19226) #19242

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include announcement to make stats cache GA
songrijie Dec 7, 2024
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Update release-7.4.0.md
songrijie Dec 7, 2024
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Update release-7.4.0.md
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@songrijie @ti-chi-bot
songrijie authored and ti-chi-bot committed Dec 9, 2024
commit f23c67070ce51b0f9d385bd5c09469436a19bc92
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Expand Up @@ -201,7 +201,8 @@ TiDB 版本：7.4.0

* 控制统计信息缓存成为正式功能 [#46695](https://github.com/pingcap/tidb/issues/46695) @[hawkingrei](https://github.com/hawkingrei)

TiDB 实例会缓存表的统计信息，加速执行计划的生成，提升性能。自 v6.1.0 开始，通过设置 [`tidb_stats_cache_mem_quota`](/system-variables.md#tidb_stats_cache_mem_quota-从-v610-版本开始引入)，TiDB 能够控制统计信息缓存的大小。当统计信息缓存达到上限时，TiDB 自动驱逐不活跃的缓存，从而提升稳定性。
TiDB 实例缓存表的统计信息，加速执行计划的生成，提升 SQL
执行性能。自 v7.4.0，对统计信息缓存大小的控制成为正式功能。通过设置 [`tidb_stats_cache_mem_quota`](/system-variables.md#tidb_stats_cache_mem_quota-从-v610-版本开始引入)，TiDB 能够控制统计信息缓存占用的内存上限。当统计信息缓存达到限额时，TiDB 自动驱逐不活跃的缓存，从而控制实例内存使用，提升稳定性。

更多信息，请参考[用户文档](/system-variables.md#tidb_stats_cache_mem_quota-从-v610-版本开始引入)。

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