High Memory Utilization

Last updated: 2021-10-20 11:26:57

    Error Description

    • Symptom 1: you received an alarm about too high memory utilization.
    • Symptom 2: the value of the memory utilization metric was high.
    • Symptom 3: more keys were evicted and response latency increased.

    Possible Reasons

    • Your business needs optimization.
    • The current memory cannot meet the requirements of your business.

    Solutions

    • Analyze the causes of high memory utilization and troubleshoot accordingly.
    • Expand instance capacity in the console if the problem persists.

    Troubleshooting Procedure

    Expanding the capacity of a Memory Edition instance in standard architecture

    Note:

    • After the configuration is adjusted, the instance will be charged at the price of the new configuration.
    • To expand the capacity of a Memory Edition instance in standard architecture, if the remaining available capacity of the physical machine is insufficient, a migration will occur, which will not affect your access to the instance. However, if the instance is running Redis 2.8, a flash disconnection will occur after the migration is completed, so we recommend that your business have a reconnection mechanism.
    • As the maximum capacity of a Memory Edition instance in standard architecture is 64 GB, you cannot expand its capacity to more than 64 GB.
    1. Log in to the TencentDB for Redis console, locate the desired instance in the instance list, and select Configure > Expand Node in the Operation column.
    2. In the pop-up dialog box, adjust the configuration and click OK.
    3. Return to the instance list. After the status of the instance changes to "Running", the instance can be used normally.

    Expanding the capacity of a Memory Edition instance in cluster architecture

    Note:

    • After the configuration is adjusted, the instance will be charged at the price of the new configuration.
    • When shards are added, the system will automatically balance the slot configuration and migrate data.
    • During capacity expansion and reduction, such blocking commands as BLPOP, BRPOP, BRPOPLPUSH, and SUBSCRIBE may fail once or more (which is related to the number of shards). Please assess the impact on your business before starting capacity expansion and reduction.
    1. Log in to the TencentDB for Redis console, locate the desired instance in the instance list, and select Configure > Add Shard or Expand Node in the Operation column.
    2. In the pop-up dialog box, adjust the configuration and click OK.
    3. Return to the instance list. After the status of the instance changes to "Running", the instance can be used normally.
    Note:

    If the problem persists, please submit a ticket.