From 5ebdbe00cc70ac8ec49b62cd1d32c1b773a36b38 Mon Sep 17 00:00:00 2001 From: zuowei593 Date: Fri, 6 Feb 2026 15:06:58 +0800 Subject: [PATCH 1/2] update tidb_dml_type limitation --- tidb-cloud/limited-sql-features.md | 1 + 1 file changed, 1 insertion(+) diff --git a/tidb-cloud/limited-sql-features.md b/tidb-cloud/limited-sql-features.md index 2db025050dcdb..a0bd324f6172a 100644 --- a/tidb-cloud/limited-sql-features.md +++ b/tidb-cloud/limited-sql-features.md @@ -142,6 +142,7 @@ TiDB Cloud works with almost all workloads that TiDB supports, but there are som | `tidb_ddl_reorg_batch_size` | No limitation | Read-only [^10] | | `tidb_ddl_reorg_priority` | No limitation | Read-only [^10] | | `tidb_ddl_reorg_worker_cnt` | No limitation | Read-only [^10] | +| `tidb_dml_type` | No limitation | Read-only [^10] | | `tidb_enable_1pc` | No limitation | Read-only [^10] | | `tidb_enable_async_commit` | No limitation | Read-only [^10] | | `tidb_enable_auto_analyze` | No limitation | Read-only [^10] | From 724efdbb91034ea3838d8f852eefc2162109592f Mon Sep 17 00:00:00 2001 From: qiancai Date: Fri, 6 Feb 2026 15:25:16 +0800 Subject: [PATCH 2/2] add a note in system-variables.md indicating that this variable is read-only for TiDB Cloud Starter and Essential clusters --- system-variables.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/system-variables.md b/system-variables.md index ad0ca26e92d7a..79af0db79a694 100644 --- a/system-variables.md +++ b/system-variables.md @@ -1954,6 +1954,10 @@ Assume that you have a cluster with 4 TiDB nodes and multiple TiKV nodes. In thi > > The bulk DML execution mode (`tidb_dml_type = "bulk"`) is an experimental feature. It is not recommended that you use it in the production environment. This feature might be changed or removed without prior notice. If you find a bug, you can report an [issue](https://github.com/pingcap/tidb/issues). In the current version, when TiDB performs large transactions using the bulk DML mode, it might affect the memory usage and execution efficiency of TiCDC, TiFlash, and the resolved-ts module of TiKV, and might cause OOM issues. Additionally, BR might be blocked and fail to process when encountering locks. Therefore, it is not recommended to use this mode when these components or features are enabled. +> **Note:** +> +> This variable is read-only for [{{{ .starter }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#starter) and [{{{ .essential }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#essential). + - Scope: SESSION - Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): Yes - Type: String