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There are 3 different configuration is available for innodb_flush_log_at_trx_commit

innodb_flush_log_at_trx_commit = 0

innodb_flush_log_at_trx_commit = 1

innodb_flush_log_at_trx_commit = 2

Which is the best configuration for innodb_flush_log_at_trx_commit?

what is the difference between this three configuration?

1

innodb_flush_log_at_trx_commit has default value of 1 - To disk on each transaction commit. is extremely expensive. Your applications can get incredible performance boost if you change the value to 2 - To OS cache on each transaction commit. To disk every second.

With a value of 2, only an operating system crash or a power outage can erase the last second of transactions. However, InnoDB's crash recovery is not affected and thus crash recovery does work regardless of the value.

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