老大：zain啊，咱们的数据库今天有多少查询语句啊？
我：额，稍等，我看看啊；心想，{尼玛，我怎么知道有多少select语句啊}

那么问题来了，如何查看MySQL数据库的生产服务器有多少的查询语句那？这里使用到了show global status like 命令来查询，同时写了一个简单的脚本，每天定时00.00执行，然后发送到管理员邮箱来实现sql语句的执行状态记录；

通过 show global status;

可以列出MySQL服务器运行sql语句的各种状态值，我个人较喜欢的用法是show global status like '查询值%';来查询某个值，下面就说一下我们线上都做了那些值得记录，
注意哦：要在并发量不大的情况下操作，在slave服务器上执行查询语句，如果在线上并发量很大的情况下操作，出现问题自己负责，这里已经做了说明，下面就开开始实操演练；

mysql> show global status; #此次在内部测试服务器操作+-----------------------------------------------+---------------------+| Variable_name | Value |+-----------------------------------------------+---------------------+| Aborted_clients | 0 || Aborted_connects| 0 || Binlog_cache_disk_use | 0 || Binlog_cache_use| 1852|| Binlog_stmt_cache_disk_use| 0 || Binlog_stmt_cache_use | 2025|| Bytes_received| 36011812|| Bytes_sent| 331183221 || Com_admin_commands| 0 || Com_assign_to_keycache| 0 || Com_alter_db| 0 || Com_alter_db_upgrade| 0 || Com_alter_event | 0 || Com_alter_function| 0 || Com_alter_procedure | 0 || Com_alter_server| 0 || Com_alter_table | 0 || Com_alter_tablespace| 0 || Com_alter_user| 0 || Com_analyze | 0 || Com_begin | 1854|| Com_binlog| 0 || Com_call_procedure| 0 || Com_change_db | 32944 || Com_change_master | 0 || Com_check | 0 || Com_checksum| 0 || Com_commit| 1852|| Com_create_db | 1 || Com_create_event| 0 || Com_create_function | 0 || Com_create_index| 0 || Com_create_procedure| 0 || Com_create_server | 0 || Com_create_table| 2009|| Com_create_trigger| 0 || Com_create_udf| 0 || Com_create_user | 0 || Com_create_view | 0 || Com_dealloc_sql | 0 || Com_delete| 18|| Com_delete_multi| 0 || Com_do| 0 || Com_drop_db | 1 || Com_drop_event| 0 || Com_drop_function | 0 || Com_drop_index| 0 || Com_drop_procedure| 0 || Com_drop_server | 0 || Com_drop_table| 14|| Com_drop_trigger| 0 || Com_drop_user | 0 || Com_drop_view | 0 || Com_empty_query | 0 || Com_execute_sql | 0 || Com_flush | 6 || Com_get_diagnostics | 0 || Com_grant | 0 || Com_ha_close| 0 || Com_ha_open | 0 || Com_ha_read | 0 || Com_help| 0 || Com_insert| 1825|| Com_insert_select | 0 || Com_install_plugin| 0 || Com_kill| 0 || Com_load| 0 || Com_lock_tables | 0 || Com_optimize| 0 || Com_preload_keys| 0 || Com_prepare_sql | 0 || Com_purge | 0 || Com_purge_before_date | 0 || Com_release_savepoint | 44|| Com_rename_table| 0 || Com_rename_user | 0 || Com_repair| 0 || Com_replace | 0 || Com_replace_select| 0 || Com_reset | 0 || Com_resignal| 0 || Com_revoke| 0 || Com_revoke_all| 0 || Com_rollback| 0 || Com_rollback_to_savepoint | 32812 || Com_savepoint | 44|| Com_select| 65692 || Com_set_option| 229794|| Com_signal| 0 || Com_show_binlog_events| 0 || Com_show_binlogs| 0 || Com_show_charsets | 0 || Com_show_collations | 0 || Com_show_create_db| 44|| Com_show_create_event | 0 || Com_show_create_func| 0 || Com_show_create_proc| 0 || Com_show_create_table | 65628 || Com_show_create_trigger | 0 || Com_show_databases| 4 || Com_show_engine_logs| 0 || Com_show_engine_mutex | 0 || Com_show_engine_status| 0 || Com_show_events | 0 || Com_show_errors | 0 || Com_show_fields | 32816 || Com_show_function_code| 0 || Com_show_function_status| 44|| Com_show_grants | 0 || Com_show_keys | 0 || Com_show_master_status| 2 || Com_show_open_tables| 0 || Com_show_plugins| 0 || Com_show_privileges | 0 || Com_show_procedure_code | 0 || Com_show_procedure_status | 44|| Com_show_processlist| 0 || Com_show_profile| 0 || Com_show_profiles | 0 || Com_show_relaylog_events| 0 || Com_show_slave_hosts| 0 || Com_show_slave_status | 1 || Com_show_status | 19|| Com_show_storage_engines| 0 || Com_show_table_status | 32816 || Com_show_tables | 88|| Com_show_triggers | 32812 || Com_show_variables| 4 || Com_show_warnings | 0 || Com_slave_start | 0 || Com_slave_stop| 0 || Com_stmt_close| 0 || Com_stmt_execute| 0 || Com_stmt_fetch| 0 || Com_stmt_prepare| 0 || Com_stmt_reprepare| 0 || Com_stmt_reset| 0 || Com_stmt_send_long_data | 0 || Com_truncate| 0 || Com_uninstall_plugin| 0 || Com_unlock_tables | 2 || Com_update| 9 || Com_update_multi| 0 || Com_xa_commit | 0 || Com_xa_end| 0 || Com_xa_prepare| 0 || Com_xa_recover| 0 || Com_xa_rollback | 0 || Com_xa_start| 0 || Compression | OFF || Connection_errors_accept| 0 || Connection_errors_internal| 0 || Connection_errors_max_connections | 0 || Connection_errors_peer_address| 0 || Connection_errors_select| 0 || Connection_errors_tcpwrap | 0 || Connections | 25|| Created_tmp_disk_tables | 65718 || Created_tmp_files | 6 || Created_tmp_tables| 98673 || Delayed_errors| 0 || Delayed_insert_threads| 0 || Delayed_writes| 0 || Flush_commands| 5 || Handler_commit| 40181 || Handler_delete| 18|| Handler_discover| 0 || Handler_external_lock | 69652 || Handler_mrr_init| 0 || Handler_prepare | 7408|| Handler_read_first| 32892 || Handler_read_key| 32800 || Handler_read_last | 0 || Handler_read_next | 2446|| Handler_read_prev | 0 || Handler_read_rnd| 2 || Handler_read_rnd_next | 1625151 || Handler_rollback| 0 || Handler_savepoint | 44|| Handler_savepoint_rollback| 32812 || Handler_update| 9 || Handler_write | 581378|| Innodb_buffer_pool_dump_status| not started || Innodb_buffer_pool_load_status| not started || Innodb_buffer_pool_pages_data | 2938|| Innodb_buffer_pool_bytes_data | 48136192|| Innodb_buffer_pool_pages_dirty| 0 || Innodb_buffer_pool_bytes_dirty| 0 || Innodb_buffer_pool_pages_flushed| 13248 || Innodb_buffer_pool_pages_free | 1024|| Innodb_buffer_pool_pages_misc | 134 || Innodb_buffer_pool_pages_total| 4096|| Innodb_buffer_pool_read_ahead_rnd | 0 || Innodb_buffer_pool_read_ahead | 2995|| Innodb_buffer_pool_read_ahead_evicted | 0 || Innodb_buffer_pool_read_requests| 3195417 || Innodb_buffer_pool_reads| 117058|| Innodb_buffer_pool_wait_free| 0 || Innodb_buffer_pool_write_requests | 659438|| Innodb_data_fsyncs| 13372 || Innodb_data_pending_fsyncs| 0 || Innodb_data_pending_reads | 0 || Innodb_data_pending_writes| 0 || Innodb_data_read| 1969115136|| Innodb_data_reads | 152955|| Innodb_data_writes| 40775 || Innodb_data_written | 484839424 || Innodb_dblwr_pages_written| 13248 || Innodb_dblwr_writes | 225 || Innodb_have_atomic_builtins | ON|| Innodb_log_waits| 0 || Innodb_log_write_requests | 84221 || Innodb_log_writes | 20817 || Innodb_os_log_fsyncs| 4488|| Innodb_os_log_pending_fsyncs| 0 || Innodb_os_log_pending_writes| 0 || Innodb_os_log_written | 50665472|| Innodb_page_size| 16384 || Innodb_pages_created| 9189|| Innodb_pages_read | 120052|| Innodb_pages_written| 13248 || Innodb_row_lock_current_waits | 0 || Innodb_row_lock_time| 0 || Innodb_row_lock_time_avg| 0 || Innodb_row_lock_time_max| 0 || Innodb_row_lock_waits | 0 || Innodb_rows_deleted | 18|| Innodb_rows_inserted| 109509|| Innodb_rows_read| 1019289 || Innodb_rows_updated | 9 || Innodb_num_open_files | 500 || Innodb_truncated_status_writes| 0 || Innodb_available_undo_logs| 128 || Key_blocks_not_flushed| 0 || Key_blocks_unused | 3349|| Key_blocks_used | 20|| Key_read_requests | 154 || Key_reads | 40|| Key_write_requests| 0 || Key_writes| 0 || Last_query_cost | 0.000000|| Last_query_partial_plans| 0 || Max_used_connections| 2 || Not_flushed_delayed_rows| 0 || Open_files| 48|| Open_streams| 0 || Open_table_definitions| 1024|| Open_tables | 1024|| Opened_files| 338824|| Opened_table_definitions| 69472 || Opened_tables | 67459 || Performance_schema_accounts_lost| 0 || Performance_schema_cond_classes_lost| 0 || Performance_schema_cond_instances_lost| 0 || Performance_schema_digest_lost| 400946|| Performance_schema_file_classes_lost| 0 || Performance_schema_file_handles_lost| 0 || Performance_schema_file_instances_lost| 0 || Performance_schema_hosts_lost | 0 || Performance_schema_locker_lost| 0 || Performance_schema_mutex_classes_lost | 0 || Performance_schema_mutex_instances_lost | 0 || Performance_schema_rwlock_classes_lost| 0 || Performance_schema_rwlock_instances_lost| 0 || Performance_schema_session_connect_attrs_lost | 0 || Performance_schema_socket_classes_lost| 0 || Performance_schema_socket_instances_lost| 0 || Performance_schema_stage_classes_lost | 0 || Performance_schema_statement_classes_lost | 0 || Performance_schema_table_handles_lost | 0 || Performance_schema_table_instances_lost | 19582 || Performance_schema_thread_classes_lost| 0 || Performance_schema_thread_instances_lost| 0 || Performance_schema_users_lost | 0 || Prepared_stmt_count | 0 || Qcache_free_blocks| 1 || Qcache_free_memory| 8371208 || Qcache_hits | 0 || Qcache_inserts| 0 || Qcache_lowmem_prunes| 0 || Qcache_not_cached | 65692 || Qcache_queries_in_cache | 0 || Qcache_total_blocks | 1 || Queries | 531413|| Questions | 525683|| Select_full_join| 0 || Select_full_range_join| 0 || Select_range| 0 || Select_range_check| 0 || Select_scan | 131435|| Slave_heartbeat_period| 1800.000|| Slave_last_heartbeat| 2018-01-19 16:04:15 || Slave_open_temp_tables| 0 || Slave_received_heartbeats | 104 || Slave_retried_transactions| 0 || Slave_running | ON|| Slow_launch_threads | 0 || Slow_queries| 32788 || Sort_merge_passes | 0 || Sort_range| 0 || Sort_rows | 0 || Sort_scan | 4 || Ssl_accept_renegotiates | 0 || Ssl_accepts | 0 || Ssl_callback_cache_hits | 0 || Ssl_cipher| || Ssl_cipher_list | || Ssl_client_connects | 0 || Ssl_connect_renegotiates| 0 || Ssl_ctx_verify_depth| 0 || Ssl_ctx_verify_mode | 0 || Ssl_default_timeout | 0 || Ssl_finished_accepts| 0 || Ssl_finished_connects | 0 || Ssl_server_not_after| || Ssl_server_not_before | || Ssl_session_cache_hits| 0 || Ssl_session_cache_misses| 0 || Ssl_session_cache_mode| NONE|| Ssl_session_cache_overflows | 0 || Ssl_session_cache_size| 0 || Ssl_session_cache_timeouts| 0 || Ssl_sessions_reused | 0 || Ssl_used_session_cache_entries| 0 || Ssl_verify_depth| 0 || Ssl_verify_mode | 0 || Ssl_version | || Table_locks_immediate | 34826 || Table_locks_waited| 0 || Table_open_cache_hits | 99275 || Table_open_cache_misses | 67459 || Table_open_cache_overflows| 64385 || Tc_log_max_pages_used | 0 || Tc_log_page_size| 0 || Tc_log_page_waits | 0 || Threads_cached| 1 || Threads_connected | 1 || Threads_created | 2 || Threads_running | 1 || Uptime| 196795|| Uptime_since_flush_status | 196795|+-----------------------------------------------+---------------------+

那么那些是我么需要注意的那？

Com_insert: 执行insert的操作次数，插入一次，累加一次，对于批量插入，也只能算一次
Com_delete: 执行delete的操作次数
Com_update: 执行update的操作次数
Com_select: 执行select的操作次数，查询一次，累加一次
Slow:为满查询次数
除了增删改查外，还包括存储过程，事务提交，回滚，表锁等情况的分析。
从对应的value值，可以知道每种语句执行的次数。
通过Com_commit,Com_rollback参数能分析出提交和回滚的状态，如果发现回滚
次数太多，这个时候一般是我们的程序编写有问题，导致程序操作数据库时，总是出现事务的回滚，
或许要从程序入手，寻找问题原因和解决办法。

# mysql -uroot -p -e "show global status like 'Com_select%';"+--------------------+--------+| Variable_name | Value |+-------------------+---------+| Com_select| 65693 |+------------------+----------+

到这里，就可以去交差了；
希望对大家有帮助！！！