Read/Write Separation

Last updated: 2021-01-05 15:46:56

    Overview

    When read requests lead to high pressure and demand on the processing of high volume of data, read/write separation can be used to distribute the read requests to secondary nodes.
    TDSQL for MySQL supports read/write separation by default. Each secondary in the primary-secondary architecture has the read-only permission. If multiple secondaries are configured, TProxy automatically assigns read requests to secondaries with lower loads to sustain the read traffic of large applications.

    How It Works

    Read/write separation is to separate read and write capabilities by letting the primary node handle transactional operations (INSERT, UPDATE, and DELETE) and the secondary nodes perform query operations (SELECT).

    Read-only Account

    A read-only account is a type of account only with read permission to read data from a secondary (or read-only replica) in a database cluster by default.
    A read-only account can be used to implement automatic distribution of read requests to secondaries and return results.

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