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Editorial Team
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Asked: 2026-05-12T19:35:08+00:00

From what I learned, a MySQL MASTER server is one that can both read

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From what I learned, a MySQL MASTER server is one that can both read and write. Correct?

My question is: Suppose you have 2 MySQL master-write servers (and many slave-read servers).

How can you solve the problem of auto-increment? How do you sync it? Suppose you are writing to both the Master1 and Master2…how will you sync it so that the auto-increment is consistent?
Can someone please explain the solution to this in a simple sense.

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1 Answer

  1. Editorial Team

    You set server #1 to use odd numbered auto increment values and server number #2 to use even numbered.

    # server 1 
auto_increment_increment 2                                
auto_increment_offset    1   

# server 2
auto_increment_increment 2                                
auto_increment_offset    2

    There’s a linux how-to which outlines the process.
    See also MySQL docs on this.

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