Help Center/ Relational Database Service_RDS for MySQL/ FAQs/ Database Connection/ What Do I Do If the Number of RDS Database Connections Reaches the Upper Limit?
Updated on 2026-10-08 GMT+08:00
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What Do I Do If the Number of RDS Database Connections Reaches the Upper Limit?

The number of database connections indicates the number of applications that can be simultaneously connected to a database, and is irrelevant to the maximum number of users allowed by your applications or websites.

If there is an excessive number of database connections, applications may fail to be connected, and the full and incremental backups may fail, affecting services.

Fault Locating

  1. Check the application connections and release unnecessary connections.
  2. Check the specifications and upgrade them if needed.
  3. Cloud Eye monitors database metrics, such as the CPU usage, memory usage, storage space usage, and database connections, and allows you to set alarm rules to identify risks if any alarms are generated. For details, see Cloud Eye User Guide.

Solution

  1. Connect to a DB instance through a private network. Using a private network prevents congestion caused by insufficient bandwidth.

    For details, see Buying an RDS for MySQL Instance and Connecting to It Using a MySQL Client.

  2. Set the innodb_adaptive_hash_index parameter to off on the console. Disabling adaptive hash indexing can reduce lock waits. For details, see Modifying Parameters of an RDS for MySQL Instance.
  3. Optimize slow queries.
Parent Topic: Database Connection