How to understand TiDB compatible MySQL parameter optimization
This article introduces the relevant knowledge of "how to understand TiDB compatible MySQL parameter optimization". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
The default SQL mode is the same as MySQL
Both TiDB and MySQL 5.7are ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Currently:
Mysql > SELECT @ @ sql_mode
->
+-- +
| | @ @ sql_mode |
+-- +
| | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
+-- +
1 row in set (0.00 sec)
Mysql >
SET [SESSION | GLOBAL] sql_mode='modes' `
SET GLOBAL sql_mode='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
Tidb
Set the maximum connection:
Set global max_user_connections=200
Mysql > show variables like'% conn%'
+-+ +
| | Variable_name | Value |
+-+ +
| | performance_schema_session_connect_attrs_size | 512 | |
| | disconnect_on_expired_password | 1 | |
| | collation_connection | utf8_general_ci |
| | character_set_connection | utf8 |
| | connect_timeout | 10 | |
| | max_user_connections | 0 | |
| | max_connections | 151 | |
| | init_connect |
| | max_connect_errors | 100 | |
+-+ +
9 rows in set (0.01 sec)
Mysql >
Mysql > show variables like'% log%'
+-+
| | Variable_name | Value |
+-+
| | relay_log_space_limit | 0 | |
| | ndb_table_no_logging |
| | relay_log_recovery | 0 | |
| | log_bin | 0 | |
| | innodb_mirrored_log_groups | 1 | |
| | innodb_log_buffer_size | 8388608 | |
| | log_slave_updates | 0 | |
| | log_error | / usr/local/mysql/data/localhost.err |
| | log_bin_use_v1_row_events | 0 | |
| | innodb_log_files_in_group | 2 | |
| | tidb_slow_log_threshold | 300 | |
| | binlog_gtid_simple_recovery | 1 | |
| | relay_log_info_file | relay-log.info |
| | back_log | 80 | |
| | tidb_general_log | 0 | |
| | innodb_log_file_size | 50331648 | |
| | innodb_api_enable_binlog | 0 | |
| | innodb_log_group_home_dir |. / | |
| | tidb_query_log_max_len | 2048 | |
| | log_output | FILE |
| | innodb_locks_unsafe_for_binlog | 0 | |
| | relay_log_info_repository | FILE |
| | innodb_undo_logs | 128 | |
| | binlog_checksum | CRC32 |
| | innodb_flush_log_at_timeout | 1 | |
| | slow_query_log_file | / usr/local/mysql/data/localhost-slow.log |
| | binlog_direct_non_transactional_updates | OFF |
| | innodb_online_alter_log_max_size | 134217728 | |
| | log_timestamps |
| | max_binlog_stmt_cache_size | 18446744073709547520 | |
| | innodb_log_compressed_pages | ON |
| | binlog_format | STATEMENT |
| | innodb_max_undo_log_size |
| | log_queries_not_using_indexes | OFF |
| | relay_log_purge | ON |
| | binlog_cache_size | 32768 | |
| | innodb_log_checksum_algorithm |
| | ndb_log_binlog_index |
| | max_binlog_cache_size | 18446744073709547520 | |
| | binlog_max_flush_queue_time | 0 | |
| | binlog_rows_query_log_events | OFF |
| | slow_query_log | OFF |
| | general_log | 0 | |
| | max_binlog_size | 1073741824 | |
| | binlog_stmt_cache_size | 32768 | |
| | sql_log_bin | 1 | |
| | general_log_file | / usr/local/mysql/data/localhost.log |
| | log_slow_slave_statements | OFF |
| | sql_log_off | OFF |
| | innodb_log_write_ahead_size |
| | log_backward_compatible_user_definitions |
| | log_syslog |
| | sync_binlog | 0 | |
| | binlog_group_commit_sync_delay |
| | log_syslog_include_pid |
| | binlog_order_commits | ON |
| | innodb_undo_log_truncate |
| | sync_relay_log_info | 10000 | |
| | log_error_verbosity |
| | log_warnings | 1 | |
| | log_syslog_facility |
| | binlogging_impossible_mode | IGNORE_ERROR |
| | ndb_log_updated_only |
| | ndb_log_empty_epochs |
| | binlog_group_commit_sync_no_delay_count |
| | innodb_flush_log_at_trx_commit | 1 | |
| | log_bin_trust_function_creators | OFF |
| | binlog_error_action | IGNORE_ERROR |
| | log_throttle_queries_not_using_indexes | 0 | |
| | max_relay_log_size | 0 | |
| | binlog_row_image | FULL |
| | sync_relay_log | 10000 | |
| | log_slow_admin_statements | OFF |
| | log_syslog_tag |
| | expire_logs_days | 0 | |
+-+
75 rows in set (0.01 sec)
Mysql >
Set global max_connections=1000; # this parameter requires db to be restarted
Restart is required after setting.
The parameter SET GLOBAL binlog_format = 'ROW'; # is dynamically modified
Restart the service:
Stop the tidb service:
Ansible-playbook stop.yml-tags=tidb
Start the tidb service:
Ansible-playbook start.yml-tags=tidb
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