Update for DM related docs

.lycheeignore

@@ -3,6 +3,9 @@ https://github\.com/.*/issues/?
 https://github\.com/.*/pull/?
 https://github\.com/.*/pull/[0-9]+
 https://github\.com/.*/issues/[0-9]+
+https://github\.com/pingcap/tiflow/blob/master/dm/docs/.*
+https://github\.com/\$user/(docs|docs-cn)
+https://.*github.*/%7B%7B%7B%20.tidb_operator_version%20%7D%7D%7D
 https?://\$?\{host}/dashboard.*
 http://xn--\$?\{ip}-m86ht9t5l1bhz9ayu7b:3000.*
 http://ip:2379.*
@@ -14,7 +17,6 @@ file://.*?http:/\$%7BPD_IP%7D:\$%7BPD_PORT%7D/dashboard.*
 http://\{grafana-ip\}:3000
 http://\{pd-ip\}:2379/dashboard
 http://localhost:\d+/
-https://github\.com/\$user/(docs|docs-cn)
 https://linux\.die\.net/man.*
 https://dev\.mysql\.com/doc/.+/5.7/en/.*
 https://dev\.mysql\.com/doc/.+/8\.0/en/.*
@@ -35,4 +37,4 @@ https://centminmod\.com/mydumper\.html
 https://docs\.pingcap\.com/tidb/v6\.6/system-variables#tidb_pessimistic_txn_aggressive_locking-new-in-v660
 https://docs\.pingcap\.com/tidb/v7\.6/system-variables#tidb_ddl_version-new-in-v760
 https://developers\.redhat\.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level
-https://.*github.*/%7B%7B%7B%20.tidb_operator_version%20%7D%7D%7D
+https://portal\.azure\.com/.*

dm/dm-compatibility-catalog.md

@@ -14,18 +14,18 @@ DM supports migrating data from different sources to TiDB clusters. Based on the
 
 ## Data sources
 
-| Data source | Compatibility level | Note |
-| - | - | - |
-| MySQL ≤ 5.5 | Not tested | |
-| MySQL 5.6 | GA | |
-| MySQL 5.7 | GA | |
-| MySQL 8.0 | GA | Does not support binlog transaction compression [Transaction_payload_event](https://dev.mysql.com/doc/refman/8.0/en/binary-log-transaction-compression.html). |
-| MySQL 8.1 ~ 8.3 | Not tested | |
-| MySQL 8.4 | Incompatible | For more information, see [DM Issue #11020](https://github.com/pingcap/tiflow/issues/11020). |
-| MySQL 9.x | Not tested | |
-| MariaDB < 10.1.2 | Incompatible | Incompatible with binlog of the time type. |
-| MariaDB 10.1.2 ~ 10.5.10 | Experimental | |
-| MariaDB > 10.5.10 | Not tested | Expected to work in most cases after bypassing the [precheck](/dm/dm-precheck.md). See [MariaDB notes](#mariadb-notes). |
+| Data source              | Compatibility level | Note |
+| ------------------------ | ------------------- | ---- |
+| MySQL ≤ 5.5              | Not tested          |      |
+| MySQL 5.6                | GA                  |      |
+| MySQL 5.7                | GA                  |      |
+| MySQL 8.0                | GA                  | Does not support binlog transaction compression [Transaction_payload_event](https://dev.mysql.com/doc/refman/8.0/en/binary-log-transaction-compression.html). |
+| MySQL 8.1 ~ 8.3          | Not tested          |      |
+| MySQL 8.4                | Incompatible        | For more information, see [DM Issue #11020](https://github.com/pingcap/tiflow/issues/11020). |
+| MySQL 9.x                | Not tested          |      |
+| MariaDB < 10.1.2         | Incompatible        | Incompatible with binlog of the time type. |
+| MariaDB 10.1.2 ~ 10.5.10 | Experimental        |      |
+| MariaDB > 10.5.10        | Not tested          | Expected to work in most cases after bypassing the [precheck](/dm/dm-precheck.md). See [MariaDB notes](#mariadb-notes). |
 
 ### Incompatibility with foreign key CASCADE operations
 

dm/dm-precheck.md

@@ -52,7 +52,7 @@ Regardless of the migration mode you choose, the precheck always includes the fo
 
 - Compatibility of the upstream MySQL table schema
 
-    - Check whether the upstream tables have foreign keys, which are not supported by TiDB. A warning is returned if a foreign key is found in the precheck.
+    - Check whether the upstream tables have foreign keys, which are not fully supported by TiDB. A warning is returned if a foreign key is found in the precheck.
     - Check whether the upstream tables use character sets that are incompatible with TiDB. For more information, see [TiDB Supported Character Sets](/character-set-and-collation.md).
     - Check whether the upstream tables have primary key constraints or unique key constraints (introduced from v1.0.7).
 
@@ -132,6 +132,7 @@ For the incremental data migration mode (`task-mode: incremental`), in addition
     - Check whether binlog is enabled (required by DM).
     - Check whether `binlog_format=ROW` is configured (DM only supports the migration of binlog in the ROW format).
     - Check whether `binlog_row_image=FULL` is configured (DM only supports `binlog_row_image=FULL`).
+    - Check whether `binlog_transaction_compression=OFF` is configured (DM does not support transaction compression).
     - If `binlog_do_db` or `binlog_ignore_db` is configured, check whether the database tables to be migrated meet the conditions of `binlog_do_db` and `binlog_ignore_db`.
 
 * (Mandatory) Check if the upstream database is in an [Online-DDL](/dm/feature-online-ddl.md) process (in which the `ghost` table is created but the `rename` phase is not executed yet). If the upstream is in the online-DDL process, the precheck returns an error. In this case, wait until the DDL to complete and retry.
@@ -144,21 +145,21 @@ For the full and incremental data migration mode (`task-mode: all`), in addition
 
 Prechecks can find potential risks in your environments. It is not recommended to ignore check items. If your data migration task has special needs, you can use the [`ignore-checking-items` configuration item](/dm/task-configuration-file-full.md#task-configuration-file-template-advanced) to skip some check items.
 
-| Check item  | Description   |
-| :---------- | :------------ |
-| `dump_privilege`         | Checks the dump privilege of the user in the upstream MySQL instance. |
-| `replication_privilege` | Checks the replication privilege of the user in the upstream MySQL instance. |
-| `version`               | Checks the version of the upstream database. |
-| `server_id`             | Checks whether server_id is configured in the upstream database. |
-| `binlog_enable`         | Checks whether binlog is enabled in the upstream database. |
-| `table_schema`          | Checks the compatibility of the table schemas in the upstream MySQL tables. |
-| `schema_of_shard_tables`| Checks the consistency of the table schemas in the upstream MySQL multi-instance shards. |
-| `auto_increment_ID`     | Checks whether the auto-increment primary key conflicts in the upstream MySQL multi-instance shards. |
-|`online_ddl`| Checks whether the upstream is in the process of [online-DDL](/dm/feature-online-ddl.md). |
-| `empty_region` | Checks the number of empty Regions in the downstream database for physical import. |
-| `region_distribution` | Checks the distribution of Regions in the downstream database for physical import. |
-| `downstream_version` | Checks the versions of TiDB, PD, and TiKV in the downstream database. |
-| `free_space` | Checks the free space of the downstream database. |
+| Check item                  | Description   |
+| :-------------------------- | :------------ |
+| `dump_privilege`            | Checks the dump privilege of the user in the upstream MySQL instance. |
+| `replication_privilege`     | Checks the replication privilege of the user in the upstream MySQL instance. |
+| `version`                   | Checks the version of the upstream database. |
+| `server_id`                 | Checks whether server_id is configured in the upstream database. |
+| `binlog_enable`             | Checks whether binlog is enabled in the upstream database. |
+| `table_schema`              | Checks the compatibility of the table schemas in the upstream MySQL tables. |
+| `schema_of_shard_tables`    | Checks the consistency of the table schemas in the upstream MySQL multi-instance shards. |
+| `auto_increment_ID`         | Checks whether the auto-increment primary key conflicts in the upstream MySQL multi-instance shards. |
+| `online_ddl`                | Checks whether the upstream is in the process of [online-DDL](/dm/feature-online-ddl.md). |
+| `empty_region`              | Checks the number of empty Regions in the downstream database for physical import. |
+| `region_distribution`       | Checks the distribution of Regions in the downstream database for physical import. |
+| `downstream_version`        | Checks the versions of TiDB, PD, and TiKV in the downstream database. |
+| `free_space`                | Checks the free space of the downstream database. |
 | `downstream_mutex_features` | Checks whether the downstream database is running tasks that are incompatible with physical import. |
 
 > **Note:**

tidb-cloud/migrate-from-mysql-using-data-migration.md

@@ -127,25 +127,26 @@ For {{{ .essential }}}, the Data Migration feature supports the following data s
 
 | Data source                                      | Supported versions |
 |:-------------------------------------------------|:-------------------|
-| Self-managed MySQL (on-premises or public cloud) | 8.0, 5.7     |
-| Amazon Aurora MySQL                              | 8.0, 5.7     |
+| Self-managed MySQL (on-premises or public cloud) | 8.0, 5.7           |
+| Amazon Aurora MySQL                              | 8.0, 5.7           |
 | Amazon RDS MySQL                                 | 8.0, 5.7           |
 | Alibaba Cloud RDS MySQL                          | 8.0, 5.7           |
-| Azure Database for MySQL - Flexible Server                          | 8.0, 5.7           |
-| Google Cloud SQL for MySQL                                                | 8.0, 5.7    |
+| Azure Database for MySQL - Flexible Server       | 8.0, 5.7           |
+| Google Cloud SQL for MySQL                       | 8.0, 5.7           |
 
 </CustomContent>
 
 ### Enable binary logs in the source MySQL-compatible database for replication
 
 To continuously replicate incremental changes from the source MySQL-compatible database to the TiDB Cloud target cluster using DM, you need the following configurations to enable binary logs in the source database:
 
-| Configuration | Required value | Why |
-|:--------------|:---------------|:----|
-| `log_bin` | `ON` | Enables binary logging, which DM uses to replicate changes to TiDB |
-| `binlog_format` | `ROW` | Captures all data changes accurately (other formats miss edge cases) |
-| `binlog_row_image` | `FULL` | Includes all column values in events for safe conflict resolution |
-| `binlog_expire_logs_seconds` | ≥ `86400` (1 day), `604800` (7 days, recommended) | Ensures DM can access consecutive logs during migration |
+| Configuration                    | Required value | Why |
+|:---------------------------------|:---------------|:----|
+| `log_bin`                        | `ON`           | Enables binary logging, which DM uses to replicate changes to TiDB |
+| `binlog_format`                  | `ROW`          | Captures all data changes accurately (other formats miss edge cases) |
+| `binlog_row_image`               | `FULL`         | Includes all column values in events for safe conflict resolution |
+| `binlog_expire_logs_seconds`     | ≥ `86400` (1 day), `604800` (7 days, recommended) | Ensures DM can access consecutive logs during migration |
+| `binlog_transaction_compression` | `OFF`          | DM does not support transaction compression |
 
 #### Check current values and configure the source MySQL instance
 
@@ -154,7 +155,7 @@ To check the current configurations, connect to the source MySQL instance and ex
 ```sql
 SHOW VARIABLES WHERE Variable_name IN
 ('log_bin','server_id','binlog_format','binlog_row_image',
-'binlog_expire_logs_seconds','expire_logs_days');
+'binlog_expire_logs_seconds','expire_logs_days','binlog_transaction_compression');
 ```
 
 If necessary, change the source MySQL instance configurations to match the required values.
@@ -170,6 +171,7 @@ If necessary, change the source MySQL instance configurations to match the requi
     binlog_format = ROW
     binlog_row_image = FULL
     binlog_expire_logs_seconds = 604800   # 7 days retention
+    binlog_transaction_compression = OFF
     ```
 
 2. Restart the MySQL service to apply the changes: