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Announce GA of memory control on stats cache (#19604) #19627

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Dec 9, 2024
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Announce GA of memory control on stats cache (#19604) #19627

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Expand Up @@ -199,6 +199,14 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v7.4/quick-start-with-

For more information, see [documentation](/system-variables.md#tidb_opt_enable_hash_join-new-in-v656-v712-and-v740).

* Memory control for the statistics cache is generally available (GA) [#45367](https://github.com/pingcap/tidb/issues/45367) @[hawkingrei](https://github.com/hawkingrei)

TiDB instances can cache table statistics to accelerate execution plan generation and improve SQL performance. Starting from v6.1.0, TiDB introduces the system variable [`tidb_stats_cache_mem_quota`](https://github.com/system-variables.md#tidb_stats_cache_mem_quota-new-in-v610). By configuring this system variable, you can set a memory usage limit for the statistics cache. When the cache reaches its limit, TiDB automatically evicts inactive cache entries, helping control instance memory usage and improve stability.

Starting from v7.4.0, this feature becomes generally available (GA).

For more information, see [documentation](/system-variables.md#tidb_stats_cache_mem_quota-new-in-v610).

### SQL

* TiDB supports partition type management [#42728](https://github.com/pingcap/tidb/issues/42728) @[mjonss](https://github.com/mjonss)
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