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It is actually running a process like mysqlbinlog. On a Slave, the IO Thread would parse the incoming binlog entries from the Master and record them in the Slave's current relay log. Keep in mind that a relay log has the exact same characteristics as a binary log. Nevertheless, it can still be helpful in two aspects. This is a double-edged sword because of how replication works. Any garbled output from mysqlbinlog that does not look like this is a definite sign of binlog corruption. I wrote about this back on : MySQL master binlog corruption.

That is actually a normal signature at the beginning of a mysqlbinlog output. WFxKTRhJAAAAXAAAAAJAYwAAABsAAAAAAAEABP//8BoSAAAAAAAAggMAAAAAAAAJUEFDS0NPVU5UĪzc3MfAaEgAAAAAAAIIDAAAAAAAACVBBQ0tDT1VOVAM3NzI= WFxKTRNJAAAAPwAAAKY/YwAAABsAAAAAAAEACHdlYmVkaTMwAA1QYXJ0bmVyQ29uZmlnAAQICA8P However, don't jump to any conclusions if you see this: If any of the output is garbled, then it it corrupt. The mysqlbinlog utility will dump a text representation of the binlog. You should never get BINLOG_SIZ greater than BINLOG_POS. If there are writes going on, BINLOG_SIZ should be greater or equal to BINLOG_POS If there are no writes going on, BINLOG_SIZ should be equal to BINLOG_POS If there are no writes going on (low writes,high reads), you could compare the filesize of the binlog with the reported binlog position. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | In light of this, you can run SHOW MASTER STATUS and get something like this: This sum is designated the binlog position Retrieves the current filesize to the statement sizeĬalculates the size of the statement it will record (comments included)Ĭomment contains filesize + statement size In other words, whenever mysqld records a SQL command, it does the following:

If this hex value is not in the header of the binlog, it is definitely corrupt.įor any binlog position, there is a a corresponding filesize. There are four(4) things to look for to see if a binlog is corrupt on not:īack on Dec 26, 2011, I wrote about a based-64 number that sits at the top of any binlog (hex value 0xfe 0圆2 0圆9 0圆e) regardless of MySQL version and regardless of binlog format (STATEMENT,ROW,MIXED).

Command line tools for xcode idmsa.apple.com