statistics: Add more variables that control auto analyze

statistics.md

@@ -32,13 +32,15 @@ Based upon the number of changes to a table, TiDB will automatically schedule [`
 
 |  System Variable | Default Value | Description |
 |---|---|---|
+| [`tidb_auto_analyze_concurrency`](/system-variables.md#tidb_auto_analyze_concurrency-new-in-v840) | `1` | The concurrency within a single automatic statistics collection task. |
 | [`tidb_auto_analyze_end_time`](/system-variables.md#tidb_auto_analyze_end_time)   | `23:59 +0000` | The end time in a day when TiDB can perform automatic updates. |
+| [`tidb_auto_analyze_partition_batch_size`](/system-variables.md#tidb_auto_analyze_partition_batch_size-new-in-v640) | `8192` | The number of partitions that TiDB automatically analyzes when analyzing a partitioned table (that is, when automatically updating statistics on a partitioned table). |
 | [`tidb_auto_analyze_ratio`](/system-variables.md#tidb_auto_analyze_ratio) | `0.5` | The threshold value of automatic update. |
 | [`tidb_auto_analyze_start_time`](/system-variables.md#tidb_auto_analyze_start_time) | `00:00 +0000` | The start time in a day when TiDB can perform automatic update. |
-| [`tidb_auto_analyze_partition_batch_size`](/system-variables.md#tidb_auto_analyze_partition_batch_size-new-in-v640) | `128` | The number of partitions that TiDB automatically analyzes when analyzing a partitioned table (that is, when automatically updating statistics on a partitioned table). |
 | [`tidb_enable_auto_analyze`](/system-variables.md#tidb_enable_auto_analyze-new-in-v610) | `ON` | Controls whether TiDB automatically executes `ANALYZE`. |
 | [`tidb_enable_auto_analyze_priority_queue`](/system-variables.md#tidb_enable_auto_analyze_priority_queue-new-in-v800) | `ON` | Controls whether to enable the priority queue to schedule the tasks of automatically collecting statistics. When this variable is enabled, TiDB prioritizes collecting statistics for tables that are more valuable to collect, such as newly created indexes and partitioned tables with partition changes. Additionally, TiDB prioritizes tables with lower health scores, placing them at the front of the queue. |
 | [`tidb_enable_stats_owner`](/system-variables.md#tidb_enable_stats_owner-new-in-v840) | `ON` | Controls whether the corresponding TiDB instance can run automatic statistics update tasks. |
+| [`tidb_max_auto_analyze_time`](/system-variables.md#tidb_max_auto_analyze_time-new-in-v610) | `43200` (12 hours) | The maximum execution time of automatic `ANALYZE` tasks. The unit is second. |
 
 When the ratio of the number of modified rows to the total number of rows of `tbl` in a table is greater than `tidb_auto_analyze_ratio`, and the current time is between `tidb_auto_analyze_start_time` and `tidb_auto_analyze_end_time`, TiDB executes the `ANALYZE TABLE tbl` statement in the background to automatically update the statistics on this table.
 

system-variables.md

@@ -3633,7 +3633,7 @@ For a system upgraded to v5.0 from an earlier version, if you have not modified
 - Persists to cluster: Yes
 - Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
 - Type: Integer
-- Default value: `43200`
+- Default value: `43200` (12 hours)
 - Range: `[0, 2147483647]`
 - Unit: Seconds
 - This variable is used to specify the maximum execution time of automatic `ANALYZE` tasks. When the execution time of an automatic `ANALYZE` task exceeds the specified time, the task will be terminated. When the value of this variable is `0`, there is no limit to the maximum execution time of automatic `ANALYZE` tasks.