This topic describes how to modify the read weights when read/write splitting is enabled.


  1. Log on to the RDS console.
  2. Select the target region.选择地域
  3. Find the target RDS instance and click the instance ID.
  4. In the left-side navigation pane, click Cluster management.
  5. In the left-right corner, click Configure Readonly Splitting Address.Configure Readonly Splitting Address buttonConfigure Readonly Splitting Address dialog box
    Parameter Description
    Read Weight Distribution A higher read weight indicates a larger number of read requests to be processed. For example, if the master instance has three read-only instances whose read weights are 100, 200, and 200, respectively, then the three read-only instances process read requests according to a 1:2:2 radio.
    • Automatic Distribution: The system automatically allocates a read weight to each existing or new read-only instance according to the instance specifications. For more information, see Rules of weight distribution by the system.
    • Customized Distribution: You must manually set the read weight of each existing read-only instance. The read weight ranges from 0 to 10000. When a new read-only instance is added, its read weight is 0 by default and you must manually modify its read weight as needed.
    Note When a read-only instance is deleted, its read weight is removed automatically. The read weights of the other read-only instances remain unchanged.