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15.5.4 Log Buffer
The log buffer is the memory area that holds data to be written to
the log files on disk. Log buffer size is defined by the
innodb_log_buffer_size variable.
The default size is 16MB. The contents of the log buffer are
periodically flushed to disk. A large log buffer enables large
transactions to run without the need to write redo log data to
disk before the transactions commit. Thus, if you have
transactions that update, insert, or delete many rows, increasing
the size of the log buffer saves disk I/O.
The
innodb_flush_log_at_trx_commit
variable controls how the contents of the log buffer are written
and flushed to disk. The
innodb_flush_log_at_timeout
variable controls log flushing frequency.
For related information, see Memory Configuration, and Section 8.5.4, “Optimizing InnoDB Redo Logging”.
Document created the 26/06/2006, last modified the 26/10/2018
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