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Binary logging confusion

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  • Binary logging confusion

    Hi all,

    I built a 3-node cluster a while ago using examples from the Percona website.
    These all state to use : binlog_format=ROW.
    However, none of them set "log_bin" so that means binary logging isn't even turned on ... or am I completely confused and is there no connection between these two variables ?

    As far as I can tell the cluster is working perfectly without the log_bin setting.
    Maybe I only need it if I want to do point-in-time recovery ?

    Any and all answers appreciated, even RTFM ones (if you can point met to the manual to read) :-)

    regards
    Jo

  • #2
    Hi Jo,

    Galera uses the standard binary logging mechanism under the hood for it's write sets. But log_bin is not required as you don't need to write binlogs to the disk, but fomat=row is still needed as galera does not work with statement or mixed ones. Sometimes enabling log_bin helps in debugging or in backups (you can stream the binlogs online with mysqlbinlog 5.6).

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    • #3
      Hi przemek;

      thanks very much for your reply ! Good to hear "officially" that my cluster is ok.
      So do I need log_bin for point-in-time recovery then or will that also work with the standard binary logging mechanism ? I'm using xtrabackup/innobackupex.

      thanks again & regards
      Jo

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