From 01a211bfec0fa96ce9fe00cb72cfef01630ab94b Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 17 Dec 2025 14:17:35 +0800 Subject: [PATCH 1/3] Add temp.md --- temp.md | 1 + 1 file changed, 1 insertion(+) create mode 100644 temp.md diff --git a/temp.md b/temp.md new file mode 100644 index 0000000000000..af27ff4986a7b --- /dev/null +++ b/temp.md @@ -0,0 +1 @@ +This is a test file. \ No newline at end of file From f215d1085a2237906948db808e51bf6aeb473b43 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 17 Dec 2025 14:17:40 +0800 Subject: [PATCH 2/3] Delete temp.md --- temp.md | 1 - 1 file changed, 1 deletion(-) delete mode 100644 temp.md diff --git a/temp.md b/temp.md deleted file mode 100644 index af27ff4986a7b..0000000000000 --- a/temp.md +++ /dev/null @@ -1 +0,0 @@ -This is a test file. \ No newline at end of file From ef3a042cb1fa92beec1744c45c5e27356adf9303 Mon Sep 17 00:00:00 2001 From: "github-actions[bot]" Date: Wed, 17 Dec 2025 06:19:04 +0000 Subject: [PATCH 3/3] Auto-sync: Update English docs from Chinese PR Synced from: https://github.com/pingcap/docs-cn/pull/21197 Target PR: https://github.com/pingcap/docs/pull/22195 AI Provider: gemini Co-authored-by: github-actions[bot] --- sql-statements/sql-statement-admin-alter-ddl.md | 2 -- system-variables.md | 4 ++-- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/sql-statements/sql-statement-admin-alter-ddl.md b/sql-statements/sql-statement-admin-alter-ddl.md index cb7c7fe593e32..f651724e97f71 100644 --- a/sql-statements/sql-statement-admin-alter-ddl.md +++ b/sql-statements/sql-statement-admin-alter-ddl.md @@ -29,8 +29,6 @@ The following are the supported parameters for different DDL jobs and their corr - `BATCH_SIZE`: the batch size. The initial value is set by [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size). - `MAX_WRITE_SPEED`: the maximum bandwidth limit for importing index records into each TiKV. The initial value is set by [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v6512-v755-and-v850). - Currently, the preceding parameters only work for `ADD INDEX` jobs that are submitted and running after [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-new-in-v710) is disabled. - > **Note:** diff --git a/system-variables.md b/system-variables.md index 5c091a59da694..74b0974575db1 100644 --- a/system-variables.md +++ b/system-variables.md @@ -1764,7 +1764,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1; - If `tidb_ddl_enable_fast_reorg` is set to `OFF`, `ADD INDEX` is executed as a transaction. If there are many update operations such as `UPDATE` and `REPLACE` in the target columns during the `ADD INDEX` execution, a larger batch size indicates a larger probability of transaction conflicts. In this case, it is recommended that you set the batch size to a smaller value. The minimum value is 32. - If the transaction conflict does not exist, or if `tidb_ddl_enable_fast_reorg` is set to `ON`, you can set the batch size to a large value. This makes data backfilling faster but also increases the write pressure on TiKV. For a proper batch size, you also need to refer to the value of `tidb_ddl_reorg_worker_cnt`. See [Interaction Test on Online Workloads and `ADD INDEX` Operations](https://docs.pingcap.com/tidb/dev/online-workloads-and-add-index-operations) for reference. - Starting from v8.3.0, this parameter is supported at the SESSION level. Modifying the parameter at the GLOBAL level will not impact currently running DDL statements. It will only apply to DDLs submitted in new sessions. - - Starting from v8.5.0, you can modify this parameter for a running DDL job by executing `ADMIN ALTER DDL JOBS BATCH_SIZE = ;`. Note that this operation is not supported for `ADD INDEX` DDL when [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-new-in-v710) is enabled. For details, see [`ADMIN ALTER DDL JOBS`](/sql-statements/sql-statement-admin-alter-ddl.md). + - Starting from v8.5.0, you can modify this parameter for a running DDL job by executing `ADMIN ALTER DDL JOBS BATCH_SIZE = ;`. ### tidb_ddl_reorg_priority @@ -1840,7 +1840,7 @@ Assume that you have a cluster with 4 TiDB nodes and multiple TiKV nodes. In thi - Unit: Threads - This variable is used to set the concurrency of the DDL operation in the `re-organize` phase. - Starting from v8.3.0, this parameter is supported at the SESSION level. Modifying the parameter at the GLOBAL level will not impact currently running DDL statements. It will only apply to DDLs submitted in new sessions. -- Starting from v8.5.0, you can modify this parameter for a running DDL job by executing `ADMIN ALTER DDL JOBS THREAD = ;`. Note that this operation is not supported for `ADD INDEX` DDL when [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-new-in-v710) is enabled. For details, see [`ADMIN ALTER DDL JOBS`](/sql-statements/sql-statement-admin-alter-ddl.md). +- Starting from v8.5.0, you can modify this parameter for a running DDL job by executing `ADMIN ALTER DDL JOBS THREAD = ;`. ### `tidb_enable_fast_create_table` New in v8.0.0