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umn/source/change_history.rst
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@ -8,6 +8,8 @@ Change History
+-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------+ +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
| Released On | Description | | Released On | Description |
+===================================+=======================================================================================================================================================+ +===================================+=======================================================================================================================================================+
| 2023-12-15 | Optimized the description of tags in :ref:`Tags <ddm_06_1000>`. |
+-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
| 2023-10-20 | Modified the following content: | | 2023-10-20 | Modified the following content: |
| | | | | |
| | Optimized the directory for monitoring management and the procedure for viewing monitoring information in :ref:`Monitoring Management <ddm_03_0050>`. | | | Optimized the directory for monitoring management and the procedure for viewing monitoring information in :ref:`Monitoring Management <ddm_03_0050>`. |

8
umn/source/data_node_management/splitting_read_and_write_requests.rst
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@ -26,14 +26,14 @@ Procedure
#. On the **Instances** page, locate the required DDM instance and click its name. #. On the **Instances** page, locate the required DDM instance and click its name.
#. In the navigation pane, choose **Data Nodes**. #. In the navigation pane, choose **Data Nodes**.
#. On the displayed page, locate the target instance and click **Configure Read Weight** in the **Operation** column. The read weight ranges from 0 to 100. #. On the displayed page, locate the target instance and click **Configure Read Weight** in the **Operation** column. The read weight can be 0 to 100.
- If you create a read replica for the associated instance, the read replica will handle all separated read requests by default. To re-assign read/write requests, you can configure read weights of the associated instance and its read replica. - If you create a read replica for the associated instance, the read replica will handle all separated read requests by default. To re-assign read/write requests, you can configure read weights of the associated instance and its read replica.
- After a read weight is set for an instance, the primary instance and its read replica process read requests based on the following formula: - After the read weights are configured, the primary instance and its read replica will handle read requests according to the following formulas:
- Read requests processed by the primary instance: Read weight of the primary instance/Total read weights of the primary instance and its read replica - Primary instance: Read weight of primary instance/Total read weights of primary instance and read replica
- Read requests processed by the read replica: Read weights of the read replica/Total read weights of the primary instance and its read replica - Read replica: Read weight of read replica/Total read weights of primary instance and read replica
For example: If an RDS for MySQL instance contains one primary instance and one read replica and read weights of the primary instance and its read replica are 20 and 80 respectively, they will process read requests in the ratio of 1:4. In other words, the primary instance processes 1/4 of read requests and read replica processes 3/4. Write requests are automatically routed to the primary instance. For example: If an RDS for MySQL instance contains one primary instance and one read replica and read weights of the primary instance and its read replica are 20 and 80 respectively, they will process read requests in the ratio of 1:4. In other words, the primary instance processes 1/4 of read requests and read replica processes 3/4. Write requests are automatically routed to the primary instance.

15
umn/source/getting_started/step_1_create_a_ddm_instance_and_an_rds_for_mysql_instance.rst
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@ -81,28 +81,15 @@ Procedure
| | **Tag key: This parameter is mandatory and cannot be null.** | | | **Tag key: This parameter is mandatory and cannot be null.** |
| | | | | |
| | - Must be unique for each instance. | | | - Must be unique for each instance. |
| | |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | |
| | - Can include 1 to 36 characters. | | | - Can include 1 to 36 characters. |
| | | | | - Cannot be an empty string or start with **\_sys\_**. |
| | - Cannot be an empty string or start with **\_sys\_**, and cannot start or end with a space. |
| | |
| | - Cannot contain the following characters: |
| | |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|", "/" |
| | | | | |
| | **Tag value: This parameter is mandatory.** | | | **Tag value: This parameter is mandatory.** |
| | | | | |
| | - Is an empty string by default. | | | - Is an empty string by default. |
| | |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | |
| | - Can contain 0 to 43 characters. | | | - Can contain 0 to 43 characters. |
| | |
| | - Cannot contain the following characters: |
| | |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|" |
+-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
#. After the configuration is complete, click **Next** at the bottom of the page. #. After the configuration is complete, click **Next** at the bottom of the page.

15
umn/source/instance_management/creating_a_ddm_instance.rst
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@ -79,28 +79,15 @@ Procedure
| | **Tag key: This parameter is mandatory and cannot be null.** | | | **Tag key: This parameter is mandatory and cannot be null.** |
| | | | | |
| | - Must be unique for each instance. | | | - Must be unique for each instance. |
| | |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | |
| | - Can include 1 to 36 characters. | | | - Can include 1 to 36 characters. |
| | | | | - Cannot be an empty string or start with **\_sys\_**. |
| | - Cannot be an empty string or start with **\_sys\_**, and cannot start or end with a space. |
| | |
| | - Cannot contain the following characters: |
| | |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|", "/" |
| | | | | |
| | **Tag value: This parameter is mandatory.** | | | **Tag value: This parameter is mandatory.** |
| | | | | |
| | - Is an empty string by default. | | | - Is an empty string by default. |
| | |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | |
| | - Can contain 0 to 43 characters. | | | - Can contain 0 to 43 characters. |
| | |
| | - Cannot contain the following characters: |
| | |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|" |
+-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
#. After the configuration is complete, click Create Now at the bottom of the page. #. After the configuration is complete, click Create Now at the bottom of the page.

5
umn/source/instance_management/modifying_parameters_of_a_ddm_instance.rst
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@ -97,10 +97,7 @@ Procedure
+----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------+ +----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------+
| force_read_master_in_transaction | Whether SQL statements involved in each transaction are read from the master node. | OFF or ON | OFF | | force_read_master_in_transaction | Whether SQL statements involved in each transaction are read from the master node. | OFF or ON | OFF |
| | | | | | | | | |
| | .. caution:: | | | | | Note: This parameter is available in version 3.0.9 or later. If this feature is enabled in version 3.0.9 but the version is downgraded to 3.0.9 below, the feature keeps enabled when the version returns to 3.0.9 or later. | | |
| | | | |
| | CAUTION: | | |
| | This parameter is available in version 3.0.9 or later. If this feature is enabled in version 3.0.9 but the version is downgraded to 3.0.9 below, the feature keeps enabled when the version returns to 3.0.9 or later. | | |
+----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------+ +----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------+
By default, DDM allows you to modify only the preceding instance parameters. If you need to modify other parameters in some special scenarios such as data migration, contact technical support. By default, DDM allows you to modify only the preceding instance parameters. If you need to modify other parameters in some special scenarios such as data migration, contact technical support.

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umn/source/service_overview/core_functions.rst
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@ -56,12 +56,8 @@ Related Services
ELB distributes incoming traffic to multiple backend servers based on the forwarding policy to balance workloads. So, it can expand external service capabilities of DDM and eliminate single points of failure (SPOFs) to improve service availability. ELB distributes incoming traffic to multiple backend servers based on the forwarding policy to balance workloads. So, it can expand external service capabilities of DDM and eliminate single points of failure (SPOFs) to improve service availability.
- Data Admin Service (DAS)
DAS provides a visualized GUI interface for you to connect to and manage cloud databases. .. figure:: /_static/images/en-us_image_0000001700277302.png
.. figure:: /_static/images/en-us_image_0000001685147546.png
:alt: **Figure 1** Relationship among DDM, VPC, ECS, and data nodes :alt: **Figure 1** Relationship among DDM, VPC, ECS, and data nodes
**Figure 1** Relationship among DDM, VPC, ECS, and data nodes **Figure 1** Relationship among DDM, VPC, ECS, and data nodes

5
umn/source/sql_syntax/functions.rst
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@ -37,7 +37,7 @@ Supported Functions
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| CONCAT | SELECT product_id, product_name, CONCAT( product_id , '(', product_name ,')' ) AS product_test FROM Products ORDER BY product_id | | CONCAT | SELECT product_id, product_name, CONCAT( product_id , '(', product_name ,')' ) AS product_test FROM Products ORDER BY product_id |
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| + | SELECT 3 \* 2+5-100/50 | | |image2| | SELECT 3 \* 2+5-100/50 |
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``-`` | SELECT 3 \* 2+5-100/50 | | ``-`` | SELECT 3 \* 2+5-100/50 |
+---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
@ -106,3 +106,6 @@ Unsupported Functions
=========== ========================================== =========== ==========================================
ROW_COUNT() Function **ROW_COUNT()** is not supported. ROW_COUNT() Function **ROW_COUNT()** is not supported.
=========== ========================================== =========== ==========================================
.. |image1| image:: /_static/images/en-us_image_0000001749511672.png
.. |image2| image:: /_static/images/en-us_image_0000001749511672.png

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umn/source/tags.rst
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@ -30,35 +30,22 @@ Adding a tag
.. table:: **Table 1** Parameter description .. table:: **Table 1** Parameter description
+-----------------------------------+-----------------------------------------------------------------------------------------------+ +-----------------------------------+----------------------------------------------------------------------------------------+
| Item | Description | | Item | Description |
+===================================+===============================================================================================+ +===================================+========================================================================================+
| Tag key | This parameter is mandatory and cannot be null. The key: | | Tag key | This parameter is mandatory and cannot be null. The key: |
| | | | | |
| | - Must be unique for each instance. | | | - Must be unique for each instance. |
| | | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). | | | - Can include 1 to 36 characters. |
| | | | | - Cannot be an empty string or start with **\_sys\_**. |
| | - Can include 1 to 36 characters. | +-----------------------------------+----------------------------------------------------------------------------------------+
| | | | Tag value | This parameter is mandatory. The value: |
| | - Cannot be an empty string or start with **\_sys\_**, and cannot start or end with a space. | | | |
| | | | | - Is an empty string by default. |
| | - Cannot contain the following characters: | | | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | | | | - Can contain 0 to 43 characters. |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|", "/" | +-----------------------------------+----------------------------------------------------------------------------------------+
+-----------------------------------+-----------------------------------------------------------------------------------------------+
| Tag value | This parameter is mandatory. The value: |
| | |
| | - Is an empty string by default. |
| | |
| | - Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@). |
| | |
| | - Can contain 0 to 43 characters. |
| | |
| | - Cannot contain the following characters: |
| | |
| | Non-printable ASCII characters (0-31), "``*``", "<", ">", "\\", ",", "|" |
+-----------------------------------+-----------------------------------------------------------------------------------------------+
#. View and manage the tag on the **Tags** page. #. View and manage the tag on the **Tags** page.

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umn/source/task_center.rst
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@ -11,18 +11,18 @@ You can view the progress and results of asynchronous tasks on the **Task Center
The following tasks can be viewed: The following tasks can be viewed:
- Creating a DDM instance - Creating a DDM Instance
- Deleting a DDM instance - Deleting a DDM instance
- Changing class of a DDM instance - Changing node class
- Scaling out a DDM instance - Scaling out a DDM instance
- Scaling in a DDM instance - Scaling in a DDM instance
- Restarting a DDM instance - Restarting a DDM instance
- Binding an EIP to a DDM instance - Binding an EIP
- Unbinding an EIP from a DDM instance - Unbinding an EIP
- Restoring data from current DDM instance - Restoring a DDM instance
- Importing schema information - Importing schema information
- Configuring shards - Configuring shards
- Retrying shard configuration - Retrying shards configuration
- Deleting a backup - Deleting a backup
- Creating a group - Creating a group
- Deleting a group - Deleting a group