需求
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。
命令行通过命令来查看select语句的次数
# 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！！！
