MySQL Advanced four--mysql log

One, log-related server variables

Mysql>show Global variables like '%log% '

+-----------------------------+----------------------------------------+

| variable_name | Value |

+-----------------------------+----------------------------------------+

| Back_log | 50 |

| Binlog_cache_size | 32768 |

| Binlog_direct_non_transactional_updates | OFF |

| Binlog_format | STATEMENT |

| Expire_logs_days | 0 |

| General_log | OFF |

| General_log_file | /root/mysql/run/mysqld/mysqld.log |

| Innodb_flush_log_at_trx_commit | 1 |

| Innodb_locks_unsafe_for_binlog | OFF |

| Innodb_log_buffer_size | 1048576 |

| Innodb_log_file_size | 5242880 |

| Innodb_log_files_in_group | 2 |

| Innodb_log_group_home_dir |./|

| innodb_mirrored_log_groups | 1 |

| Log | OFF |

| Log_bin | OFF |

| log_bin_trust_function_creators | OFF |

| log_bin_trust_routine_creators | OFF |

| Log_error | /root/mysql/log/mysqld.log |

| Log_output | FILE |

| log_queries_not_using_indexes | OFF |

| Log_slave_updates | OFF |

| log_slow_queries | OFF |

| log_warnings | 1 |

| Max_binlog_cache_size | 18446744073709547520 |

| Max_binlog_size | 1073741824 |

| Max_relay_log_size | 0 |

|                        Relay_log | |

|                      Relay_log_index | |

| Relay_log_info_file | Relay-log.info |

| Relay_log_purge | On |

| Relay_log_space_limit | 0 |

| Slow_query_log | OFF |

| Slow_query_log_file | /root/mysql/run/mysqld/mysqld-slow.log |

| Sql_log_bin | On |

| Sql_log_off | OFF |

| Sql_log_update | On |

| Sync_binlog | 0 |

+--------------------------+----------------------------------------+

Second, the type of log:

1. Query log:

(1), the query operation generated during the system query, the default is closed.

(2), the relevant server parameters:

Log

Log_output

General_log

General_log_file

2, slow query log: Query execution time longer than the specified length of the query, that is, slow query.

3. Error log:

4. Binary log: MySQL's replication feature relies on this log.

5. Relay LOG: Logs that are read and saved from the server from the primary server.

6. Transaction log:

MySQL Advanced four--mysql log