pingcap · Frank945946 · Nov 6, 2025 · Nov 7, 2025 · Nov 7, 2025 · Nov 7, 2025
diff --git a/sql-statements/sql-statement-admin-alter-ddl.md b/sql-statements/sql-statement-admin-alter-ddl.md
@@ -31,6 +31,14 @@ The following are the supported parameters for different DDL jobs and their corr
 
   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.
 
+<CustomContent platform="tidb-cloud" plan="premium">
+
+> **Note:**
+>
+> For {{{ .premium }}}, both `THREAD` and `MAX_WRITE_SPEED` are automatically tuned to appropriate values and cannot be modified by users. If you need to adjust these settings, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).
+
+</CustomContent>
+
 - `MODIFY COLUMN`:
     - `THREAD`: the concurrency of the DDL job. The initial value is set by `tidb_ddl_reorg_worker_cnt`.
     - `BATCH_SIZE`: the batch size. The initial value is set by `tidb_ddl_reorg_batch_size`.

diff --git a/sql-statements/sql-statement-import-into.md b/sql-statements/sql-statement-import-into.md
@@ -159,6 +159,14 @@ The supported options are described as follows:
 | `CLOUD_STORAGE_URI` | All file formats | Specifies the target address where encoded KV data for [Global Sort](/tidb-global-sort.md) is stored. When `CLOUD_STORAGE_URI` is not specified, `IMPORT INTO` determines whether to use Global Sort based on the value of the system variable [`tidb_cloud_storage_uri`](/system-variables.md#tidb_cloud_storage_uri-new-in-v740). If this system variable specifies a target storage address, `IMPORT INTO` uses this address for Global Sort. When `CLOUD_STORAGE_URI` is specified with a non-empty value, `IMPORT INTO` uses that value as the target storage address. When `CLOUD_STORAGE_URI` is specified with an empty value, local sorting is enforced. Currently, the target storage address only supports S3. For details about the URI configuration, see [Amazon S3 URI format](/external-storage-uri.md#amazon-s3-uri-format). When this feature is used, all TiDB nodes must have read and write access for the target S3 bucket, including at least these permissions: `s3:ListBucket`, `s3:GetObject`, `s3:DeleteObject`, `s3:PutObject`, `s3: AbortMultipartUpload`. |
 | `DISABLE_PRECHECK` | All file formats and query results of `SELECT` | Setting this option disables pre-checks of non-critical items, such as checking whether there are CDC or PITR tasks.  |
 
+<CustomContent platform="tidb-cloud" plan="premium">
+
+> **Note:**
+>
+> For {{{ .premium }}}, the following four options — `DISK_QUOTA`, `THREAD`, `MAX_WRITE_SPEED`, and `CLOUD_STORAGE_URI` — are automatically tuned to appropriate values and cannot be modified by users. If you need to adjust these settings, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).
+
+</CustomContent>
+
 ## `IMPORT INTO ... FROM FILE` usage
 
 For TiDB Self-Managed, `IMPORT INTO ... FROM FILE` supports importing data from files stored in Amazon S3, GCS, and the TiDB local storage. For [TiDB Cloud Dedicated](https://docs.pingcap.com/tidbcloud/select-cluster-tier#tidb-cloud-dedicated), `IMPORT INTO ... FROM FILE` supports importing data from files stored in Amazon S3 and GCS. For [{{{ .starter }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#starter) and [{{{ .essential }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#essential), `IMPORT INTO ... FROM FILE` supports importing data from files stored in Amazon S3 and Alibaba Cloud OSS.

diff --git a/system-variables.md b/system-variables.md
@@ -1576,10 +1576,23 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
 
 ### tidb_ddl_disk_quota <span class="version-mark">New in v6.3.0</span>
 
+<CustomContent platform="tidb-cloud" plan="starter,essential">
+
 > **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).
 
+</CustomContent>
+
+<CustomContent platform="tidb-cloud" plan="premium">
+
+> **Note:**
+>
+> - This variable is read-only for [{{{ .starter }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#starter), [{{{ .essential }}}](https://docs.pingcap.com/tidbcloud/select-cluster-tier#essential), and [{{{ .premium }}}](https://docs-preview.pingcap.com/tidbcloud/tidb-cloud-intro/#deployment-options).
+> - For {{{ .premium }}}, this variable is automatically tuned to an appropriate value and cannot be modified by users. If you need to adjust the setting, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).
+
+</CustomContent>
+
 - Scope: GLOBAL
 - Persists to cluster: Yes
 - Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
@@ -1733,12 +1746,36 @@ Assume that you have a cluster with 4 TiDB nodes and multiple TiKV nodes. In thi
 - When Global Sort is disabled, only one TiDB node writes to TiKV at a time. In this case, the maximum write bandwidth per TiKV node is `100MiB`.
 - When Global Sort is enabled, all 4 TiDB nodes can write to TiKV simultaneously. In this case, the maximum write bandwidth per TiKV node is `4 * 100MiB = 400MiB`.
 
+<CustomContent platform="tidb-cloud" plan="premium">
+
+> **Note:**
+>
+> For {{{ .premium }}}, this parameter is automatically tuned to an appropriate value and cannot be modified by users. If you need to adjust the setting, contact [TiDB Cloud support](/tidb-cloud/tidb-cloud-support.md).
+
+</CustomContent>
+
 ### tidb_ddl_reorg_worker_cnt
 
+<CustomContent platform="tidb-cloud">
+
+<CustomContent plan="starter,essential">
+
 > **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).
 
+</CustomContent>
+
+<CustomContent plan="premium">
+
+> **Note:**
+>
+> This TiDB variable is not applicable to {{{ .premium }}}.
+
+</CustomContent>
+
+</CustomContent>
+
 - Scope: SESSION | GLOBAL
 - Persists to cluster: Yes
 - Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No

diff --git a/tidb-global-sort.md b/tidb-global-sort.md
@@ -60,6 +60,14 @@ To enable Global Sort, follow these steps:
     SET GLOBAL tidb_cloud_storage_uri = 's3://my-bucket/test-data?role-arn=arn:aws:iam::888888888888:role/my-role'
     ```
 
+    <CustomContent plan="premium">
+
+    > **Note:**
+    >
+    > For {{{ .premium }}}, this parameter is automatically configured and does not require manual adjustment. If you need to modify it, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).
+
+    </CustomContent>
+
 </CustomContent>
 
 > **Note:**