Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

*: upgrade tidb_auto_analyze_partition_batch_size default value #19817

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
+2 −2
Open

*: upgrade tidb_auto_analyze_partition_batch_size default value #19817

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
4103028
*: upgrade tidb_auto_analyze_partition_batch_size default value
hawkingrei Dec 26, 2024
3b153e9
Update system-variables.md
hawkingrei Jan 27, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 2 additions & 2 deletions system-variables.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1212,8 +1212,8 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Default value: `128`. Before v7.6.0, the default value is `1`.
- Range: `[1, 1024]`
- Default value: `8192`. Before v7.6.0, the default value is `1`. Starting from v8.2.0, the default value is changed from `1024` to `8192`.
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Suggested change
- Default value: `8192`. Before v7.6.0, the default value is `1`. Starting from v8.2.0, the default value is changed from `1024` to `8192`.
- Default value: `8192`. Before v7.6.0, the default value is `1`. Starting from v8.2.0, the default value is changed from `128` to `8192`.

- Range: `[1, 8192]`. Before v8.2.0, the value range is `[1, 1024]`.
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please update the release notes for v8.2.0 to include changes (default value and value range) to the tidb_auto_analyze_partition_batch_size system variable:

docs/releases/release-8.2.0.md

Lines 174 to 183 in 3b153e9

### System variables
| Variable name | Change type | Description |
|--------|------------------------------|------|
| [`tidb_analyze_distsql_scan_concurrency`](/system-variables.md#tidb_analyze_distsql_scan_concurrency-new-in-v760) | Modified | Changes the minimum value from `1` to `0`. When you set it to `0`, TiDB adaptively adjusts the concurrency of the `scan` operation when executing the `ANALYZE` operation based on the cluster size.|
| [`tidb_analyze_skip_column_types`](/system-variables.md#tidb_analyze_skip_column_types-new-in-v720) | Modified | Starting from v8.2.0, TiDB does not collect columns of `MEDIUMTEXT` and `LONGTEXT` types by default to avoid potential OOM risks.|
| [`tidb_enable_historical_stats`](/system-variables.md#tidb_enable_historical_stats) | Modified | Changes the default value from `ON` to `OFF`, which turns off historical statistics to avoid potential stability issues.|
| [`tidb_executor_concurrency`](/system-variables.md#tidb_executor_concurrency-new-in-v50) | Modified | Adds support for setting the concurrency of the `sort` operator. |
| [`tidb_sysproc_scan_concurrency`](/system-variables.md#tidb_sysproc_scan_concurrency-new-in-v650) | Modified | Changes the minimum value from `1` to `0`. When you set it to `0`, TiDB adaptively adjusts the concurrency of `scan` operations performed when executing internal SQL statements based on the cluster size.|
| [`tidb_resource_control_strict_mode`](/system-variables.md#tidb_resource_control_strict_mode-new-in-v820) | Newly added | Controls whether privilege control is applied to the [`SET RESOURCE GROUP`](/sql-statements/sql-statement-set-resource-group.md) statement and the [`RESOURCE_GROUP()`](/optimizer-hints.md#resource_groupresource_group_name) optimizer hint.|

- This variable specifies the number of partitions that TiDB [automatically analyzes](/statistics.md#automatic-update) when analyzing a partitioned table (which means automatically collecting statistics on a partitioned table).
- If the value of this variable is smaller than the number of partitions, TiDB automatically analyzes all partitions of the partitioned table in multiple batches. If the value of this variable is greater than or equal to the number of partitions, TiDB analyzes all partitions of the partitioned table at the same time.
- If the number of partitions of a partitioned table is far greater than this variable value and the auto-analyze takes a long time, you can increase the value of this variable to reduce the time consumption.
Expand Down
Loading