Update sql-faq.md

faq/sql-faq.md

@@ -229,11 +229,9 @@ You can combine the above two parameters with the DML of TiDB to use them. For e
 
 ## What's the trigger strategy for `auto analyze` in TiDB?
 
-Trigger strategy: `auto analyze` is automatically triggered when the number of rows in a new table reaches 1000.
+When the number of rows in a new table reaches 1000, and the ratio (the number of modified rows / the current total number of rows) is larger than `tidb_auto_analyze_ratio`, the `auto analyze` statement is automatically triggered. The default value of `tidb_auto_analyze_ratio` is `0.5`, indicating that this feature is enabled by default. To ensure safety, its minimum value is `0.3` when the feature is enabled, and it must be smaller than `pseudo-estimate-ratio` whose default value is `0.8`; otherwise pseudo statistics will be used for a period of time. It is recommended to set `tidb_auto_analyze_ratio` to `0.5`.
 
-When the ratio (the number of modified rows / the current total number of rows) is larger than `tidb_auto_analyze_ratio`, the `analyze` statement is automatically triggered. The default value of `tidb_auto_analyze_ratio` is 0.5, indicating that this feature is enabled by default. To ensure safety, its minimum value is 0.3 when the feature is enabled, and it must be smaller than `pseudo-estimate-ratio` whose default value is 0.8, otherwise pseudo statistics will be used for a period of time. It is recommended to set `tidb_auto_analyze_ratio` to 0.5.
-
-To disable auto analyze, use the system variable `tidb_enable_auto_analyze`.
+To disable `auto analyze`, use the system variable `tidb_enable_auto_analyze`.
 
 ## Can I use optimizer hints to override the optimizer behavior?