MySQL：一个简单insert语句的大概流程
简单记录，可能有误，主要记录重要的接口以备后用。
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一、操作说明
我建了一个简单的表，插入一个简单的数据。
MySQL> create table testin(id int); Query OK, 0 rows affected (2.38 sec) mysql> insert into testin values(10); Query OK, 1 row affected (0.02 sec)
主要跟踪这个简单的插入语句在插入过程的经历。主要集中在插入流程和提交流程，不包含前期的其他阶段。
下面是这个语句经历的所有的阶段：
126 T@2: | THD::enter_stage: 'starting' /root/mysql5.7.14/percona-server-5.7.14-7/sql/conn_handler/socket_connection.cc:100 349 T@2: | | | | | | THD::enter_stage: 'checking permissions' /root/mysql5.7.14/percona-server-5.7.14-7/sql/auth/sql_authorization.cc:843 359 T@2: | | | | | | | THD::enter_stage: 'Opening tables' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_base.cc:5719 1078 T@2: | | | | | THD::enter_stage: 'init' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_insert.cc:470 1155 T@2: | | | | | | | THD::enter_stage: 'System lock' /root/mysql5.7.14/percona-server-5.7.14-7/sql/lock.cc:321 1253 T@2: | | | | | THD::enter_stage: 'update' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_insert.cc:663 1535 T@2: | | | | | THD::enter_stage: 'end' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_insert.cc:881 1544 T@2: | | | | THD::enter_stage: 'query end' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_parse.cc:5174 1603 T@2: | | | | THD::enter_stage: 'closing tables' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_parse.cc:5252 1730 T@2: | | | THD::enter_stage: 'freeing items' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_parse.cc:5855 1793 T@2: | | THD::enter_stage: 'cleaning up' /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_parse.cc:1884 1824 T@2: | THD::enter_stage: 'starting' /root/mysql5.7.14/percona-server-5.7.14-7/sql/conn_handler/socket_connection.cc:100
主要集中在：
- update
- query end
两个阶段
二、大概流程
1、乐观插入的流程Sql_cmd_insert::mysql_insert
>Sql_cmd_insert::mysql_insert
>切换session状态为 update
>进入插入逻辑
>handler::ha_write_row
>ha_innobase::write_row
>row_insert_for_mysql
>row_insert_for_mysql_using_ins_graph
>trx_start_if_not_started_xa_low
>trx_start_low 激活事物，事物状态由 not_active 变为 active
>row_ins_step
>row_ins
>row_ins_index_entry_step
>row_ins_index_entry
>row_ins_clust_index_entry
>row_ins_clust_index_entry_low
>btr_cur_search_to_nth_level 查找定位数据
>btr_cur_optimistic_insert 进行乐观插入
>btr_cur_ins_lock_and_undo
>trx_undo_report_row_operation
>trx_undo_page_report_insert 记录insert的undo记录
>trx_undo_page_set_next_prev_and_add
>trx_undof_page_add_undo_rec_log 记录undo的redo log 入redo buffer
>page_cur_tuple_insert 进行insert 元组插入，及实际的插入操作
>page_cur_insert_rec_write_log 记录插入的redo log 入redo buffer
>binlog_log_row
>write_locked_table_maps
>THD::binlog_write_table_map
>binlog_start_trans_and_stmt
>binlog_cache_data::write_event binlog event 写入到 binlog cache
2、其提交流程
进入提交逻辑
mysql_execute_command
>切换session状态为 query end >trans_commit_stmt
>ha_commit_trans
>MYSQL_BIN_LOG::prepare
>ha_prepare_low
>binlog_prepare 生成last_commit
>innobase_xa_prepare
>trx_prepare_for_mysql
>trx_prepare 转换事物状态为，事物状态由 active 变为 prepare
>MYSQL_BIN_LOG::commit
>MYSQL_BIN_LOG::ordered_commit
>MYSQL_BIN_LOG::process_flush_stage_queue
>ha_flush_logs
>plugin_foreach_with_mask
>flush_handlerton
>innobase_flush_logs
>log_buffer_flush_to_disk
>log_write_up_to
>log_group_write_buf innodb 组提交，确保redo落盘
>MYSQL_BIN_LOG::flush_thread_caches
>binlog_cache_mngr::flush
>binlog_cache_data::flush binlog cache 进行flush到binlog文件
>MYSQL_BIN_LOG::sync_binlog_file fsync binlog文件进行os缓存落盘
>MYSQL_BIN_LOG::process_commit_stage_queue
>ha_commit_low
>innobase_commit
>innobase_commit_low
>trx_commit_in_memory innodb 进行提交,事物状态由 prepare 变为 not_active 可以看到整个语句的流程大概为
-
会话状态转换为update
-
激活事物状态由 not_active 变为 active
-
查找定位数据
-
进行乐观插入
- 记录insert的undo记录
- 记录undo的redo log 入redo buffer
- 进行insert 元组插入，及实际的插入操作
- 记录插入的redo log 入redo buffer
-
binlog event 写入到 binlog cache
-
会话状态转换为query end
-
进入提交准备
- binlog准备
- innodb层事物准备，状态由 active变为 prepare
-
进入提交阶段
- innodb进行组提交，确保redo落盘
- binlog cache 进行flush到binlog文件
- fsync binlog文件进行os缓存落盘
- innodb 进行提交,事物状态由 prepare 变为 not_active
这只是大概流程其中很多很多的细节，不过有了入口函数也许好分析一些。
三、备用栈帧
Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000ebd5f3 in main(int, char**) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/main.cc:25 breakpoint already hit 1 time 5 breakpoint keep y 0x0000000001a90776 in page_cur_insert_rec_write_log(rec_t*, ulint, rec_t*, dict_index_t*, mtr_t*)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/page/page0cur.cc:964 breakpoint already hit 7 times 8 breakpoint keep y 0x0000000001bc8f96 in trx_undo_page_report_insert(ib_page_t*, trx_t*, dict_index_t*, dtuple_t const*, mtr_t*)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/trx/trx0rec.cc:478 breakpoint already hit 5 times 9 breakpoint keep y 0x0000000001bc84c4 in trx_undof_page_add_undo_rec_log(ib_page_t*, ulint, ulint, mtr_t*)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/trx/trx0rec.cc:67 breakpoint already hit 20 times 10 breakpoint keep y 0x00000000019a932d in innobase_start_trx_and_assign_read_view(handlerton*, THD*)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/handler/ha_innodb.cc:4499 11 breakpoint keep y 0x0000000001bddbfc in trx_start_low(trx_t*, bool) at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/trx/trx0trx.cc:1380 breakpoint already hit 3 times 12 breakpoint keep y 0x0000000001c1e9eb in btr_cur_search_to_nth_level(dict_index_t*, ulint, dtuple_t const*, page_cur_mode_t, ulint, btr_cur_t*, ulint, char const*, ulint, mtr_t*) at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/btr/btr0cur.cc:770 breakpoint already hit 13 times 13 breakpoint keep y 0x0000000001859c85 in binlog_start_trans_and_stmt(THD*, Log_event*) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/binlog.cc:9737 breakpoint already hit 1 time 14 breakpoint keep y 0x0000000001845822 in binlog_cache_data::write_event(THD*, Log_event*) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/binlog.cc:1114 breakpoint already hit 3 times 15 breakpoint keep y 0x000000000153a2a3 in THD::enter_stage(PSI_stage_info const*, PSI_stage_info*, char const*, char const*, unsigned int)
at /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_class.cc:732 breakpoint already hit 8 times 17 breakpoint keep y 0x0000000001be195a in trx_prepare(trx_t*) at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/trx/trx0trx.cc:2947 breakpoint already hit 3 times 19 breakpoint keep y 0x0000000000f63801 in ha_commit_trans(THD*, bool, bool) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/handler.cc:1684 breakpoint already hit 21 times 21 breakpoint keep y 0x0000000001846901 in binlog_prepare(handlerton*, THD*, bool) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/binlog.cc:1578 breakpoint already hit 3 times 24 breakpoint keep y 0x00000000019c2c64 in innobase_xa_prepare(handlerton*, THD*, bool)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/handler/ha_innodb.cc:17458 breakpoint already hit 2 times 25 breakpoint keep y 0x00000000019a9788 in innobase_commit(handlerton*, THD*, bool)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/handler/ha_innodb.cc:4652 breakpoint already hit 2 times 26 breakpoint keep y 0x0000000001846442 in binlog_cache_data::flush(THD*, my_off_t*, bool*) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/binlog.cc:1408 breakpoint already hit 2 times 27 breakpoint keep y 0x0000000001857c19 in MYSQL_BIN_LOG::sync_binlog_file(bool) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/binlog.cc:8802 breakpoint already hit 1 time 28 breakpoint keep y 0x0000000001bdf2f5 in trx_commit_in_memory(trx_t*, mtr_t const*, bool)
at /root/mysql5.7.14/percona-server-5.7.14-7/storage/innobase/trx/trx0trx.cc:1973 作者微信：
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