文章目录
-
-
- 通用查询日志
- 慢查询日志
- 错误日志
- 二进制日志
- 参考
通用查询日志
mysql> show variables like '%version%';
+-------------------------+------------------------------+
| Variable_name | Value |
+-------------------------+------------------------------+
| innodb_version | 5.7.25 |
| protocol_version | 10 |
| slave_type_conversions | |
| tls_version | TLSv1,TLSv1.1 |
| version | 5.7.25-log |
| version_comment | MySQL Community Server (GPL) |
| version_compile_machine | x86_64 |
| version_compile_os | Linux |
+-------------------------+------------------------------+
8 rows in set (0.00 sec)
mysql> show variables like '%general%';
+------------------+--------------------------------------------------+
| Variable_name | Value |
+------------------+--------------------------------------------------+
| general_log | OFF |
| general_log_file | /home/autoInstall_1.2.1/mysql/data/hessian03.log |
+------------------+--------------------------------------------------+
2 rows in set (0.00 sec)
开启通用日志查询：
mysql> set global general_log = on;
Query OK, 0 rows affected (0.00 sec)
关闭通用日志查询：
set global general_log = off;
mysql> show variables like 'log_output';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_output | FILE |
+---------------+-------+
1 row in set (0.00 sec)
当前慢文件格式为file ，存储在数据库的数据文件中的hostname.log
可以是table格式，存储在数据库的数据文件中的mysql.general_log
设置通用日志输出为表方式：
set global log_output = 'file';
设置通用日志输出为表和文件方式：
set global log_output = 'file,table';
慢查询日志
mysql> show variables like '%quer%';
+----------------------------------------+-------------------------------------------------------+
| Variable_name | Value |
+----------------------------------------+-------------------------------------------------------+
| binlog_rows_query_log_events | OFF |
| ft_query_expansion_limit | 20 |
| have_query_cache | YES |
| log_queries_not_using_indexes | OFF |
| log_throttle_queries_not_using_indexes | 0 |
| long_query_time | 10.000000 |
| query_alloc_block_size | 8192 |
| query_cache_limit | 1048576 |
| query_cache_min_res_unit | 4096 |
| query_cache_size | 1048576 |
| query_cache_type | OFF |
| query_cache_wlock_invalidate | OFF |
| query_prealloc_size | 8192 |
| slow_query_log | OFF |
| slow_query_log_file | /home/autoInstall_1.2.1/mysql/data/hessian03-slow.log |
+----------------------------------------+-------------------------------------------------------+
15 rows in set (0.00 sec)
1）slow_query_log 的值为ON 为开启慢查询日志，off表示关闭慢查询日志
2） slow_query_log_file 的值是记录的慢查询日志到文件中（默认为主机 名.log）
3）long_query_time 指定了慢查询的阈值，即执行语句的时间若超过这个值则为慢查询语句
4）log_queries_not_using_indexes 如果该值是ON，则会记录所有没有利用索引来进行查询的语句，前提是slow_query_log 的值也是ON,否则，不会奏效
查询当前慢查询的语句个数：
show global status like '%slow%';
可以通过查询语句查看慢查询的语句：
select * from mysql.slow_log;
错误日志
mysql> show variables like '%log_error%';
+---------------------+---------------------+
| Variable_name | Value |
+---------------------+---------------------+
| binlog_error_action | ABORT_SERVER |
| log_error | /var/log/mysqld.log |
| log_error_verbosity | 3 |
+---------------------+---------------------+
3 rows in set (0.00 sec)
错误日志归档，备份错误日志
shell>mv host_name.err host_name.err-old
shell> mysqladmin -u root -p flush-logs
ahell>mv host_name.err-old back-directory
二进制日志
mysql> show variables like '%log_bin%';
+---------------------------------+-----------------------------------------------------+
| Variable_name | Value |
+---------------------------------+-----------------------------------------------------+
| log_bin | ON |
| log_bin_basename | /home/autoInstall_1.2.1/mysql/data/master-bin |
| log_bin_index | /home/autoInstall_1.2.1/mysql/data/master-bin.index |
| log_bin_trust_function_creators | OFF |
| log_bin_use_v1_row_events | OFF |
| sql_log_bin | ON |
+---------------------------------+-----------------------------------------------------+
6 rows in set (0.00 sec)
mysql> show variables like '%binlog%';
+--------------------------------------------+----------------------+
| Variable_name | Value |
+--------------------------------------------+----------------------+
| binlog_cache_size | 32768 |
| binlog_checksum | CRC32 |
| binlog_direct_non_transactional_updates | OFF |
| binlog_error_action | ABORT_SERVER |
| binlog_format | ROW |
| binlog_group_commit_sync_delay | 0 |
| binlog_group_commit_sync_no_delay_count | 0 |
| binlog_gtid_simple_recovery | ON |
| binlog_max_flush_queue_time | 0 |
| binlog_order_commits | ON |
| binlog_row_image | FULL |
| binlog_rows_query_log_events | OFF |
| binlog_stmt_cache_size | 32768 |
| binlog_transaction_dependency_history_size | 25000 |
| binlog_transaction_dependency_tracking | COMMIT_ORDER |
| innodb_api_enable_binlog | OFF |
| innodb_locks_unsafe_for_binlog | OFF |
| log_statements_unsafe_for_binlog | ON |
| max_binlog_cache_size | 18446744073709547520 |
| max_binlog_size | 1073741824 |
| max_binlog_stmt_cache_size | 18446744073709547520 |
| sync_binlog | 1 |
+--------------------------------------------+----------------------+
22 rows in set (0.00 sec)
mysql> show variables like '%datadir%';
+---------------+-------------------------------------+
| Variable_name | Value |
+---------------+-------------------------------------+
| datadir | /home/autoInstall_1.2.1/mysql/data/ |
+---------------+-------------------------------------+
1 row in set (0.01 sec)
参考
