*: update analyze statement
#3241
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| --- | ||
| title: ANALYZE | ||
| summary: TiDB 数据库中 ANALYZE 的使用概况。 | ||
| category: reference | ||
| aliases: ['/docs-cn/dev/reference/sql/statements/analyze-table/'] | ||
| --- | ||
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| # ANALYZE | ||
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| `ANALYZE` 语句用于更新 TiDB 在表和索引上留下的统计信息。执行大批量更新或导入记录后，或查询执行计划不是最佳时，建议运行 `ANALYZE`。 | ||
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| 当 TiDB 逐渐发现这些统计数据与预估不一致时，也会自动更新其统计数据。 | ||
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| 目前 TiDB 收集统计信息分为全量收集和增量收集两种方式，分别通过 `ANALYZE TABLE` 和 `ANALYZE INCREMENTAL TABLE` 语句来实现。关于这两种语句的详细使用方式，可参考[统计信息简介](/statistics.md)。 | ||
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| ## 语法图 | ||
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| **AnalyzeTableStmt:** | ||
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@@ -102,7 +104,9 @@ EXPLAIN SELECT * FROM t1 WHERE c1 = 3; | |
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| ## MySQL 兼容性 | ||
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| * `ANALYZE TABLE` 在语法上与 MySQL 类似。但 `ANALYZE TABLE` 在 TiDB 上的执行时间可能长得多，因为它的内部运行方式不同。 | ||
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| * 在 MySQL 上不支持 `ANALYZE INCREMENTAL TABLE` 语句，它的使用可参考[增量收集文档](/statistics.md#增量收集)。 | ||
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| ## 另请参阅 | ||
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ANALYZE TABLE语句用于更新表和索引的统计信息。执行大批量更新或导入记录后，或查询执行计划不是最佳时，建议运行ANALYZE TABLE。