Shulou(Shulou.com)06/01 Report--

Max_binlog_files is a parameter provided by the Percona MySQL branch to limit the number of binlog files. It is a very practical parameter when archived data is deleted and binlog grows rapidly.

This parameter also provides protection for the binlog being used, which is purge-proof, as shown below.

[root@mysql.sock] [(none)] > purge binary logs to 'bin.016222'

Query OK, 0 rows affected, 1 warning (0.01 sec)

[root@mysql.sock] [(none)] > > show warnings

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| | Level | Code | Message | |

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| Warning | 1867 | file. / bin.016215 was not purged because it was being read by 1 thread (s), purged only 0 out of 7 files. | |

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1 row in set (0.00 sec)

$perror 1867

MySQL error code 1867 (ER_WARN_PURGE_LOG_IN_USE): file% s was not purged because it was being read by% d thread (s), purged only% d out of% d files.

It is also reflected in the error log.

2019-09-18T01:02:56.643574+08:00 10326541 [Warning] file. / bin.016215 was not purged because it was being readby thread number 17218543

2019-09-18T01:03:18.196285+08:00 17244031 [Warning] file. / bin.016215 was not purged because it was being readby thread number 17218543

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