[笔记]MySQL查看事务信息

我们可以使用

status

获取当前连接的状态：

mysql>status-- 查看当前连接状态--------------
D:\mysql\bin\mysql.exe  Ver 14.14 Distrib 5.7.36,for Win64 (x86_64)-- 当前连接使用的客户端

Connection id:          3-- 当前连接id(线程id)Currentdatabase:       test -- 当前连接数据库Currentuser:           root@localhost-- 当前连接用户
SSL:                    Cipher inuseis ECDHE-RSA-AES128-GCM-SHA256
Usingdelimiter:        ;-- 当前连接分隔符
Server version:         5.7.36-log MySQL Community Server (GPL)
Protocol version:       10
Connection:             localhost via TCP/IP
Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    gbk
Conn.  characterset:    gbk
TCP port:               3306
Uptime:                 2 hours 23 min 1 sec

Threads: 2  Questions: 38  Slow queries: 0  Opens: 121  Flush tables: 1Opentables: 114  Queries per second avg: 0.004--------------

Connection id 表示当前会话的连接线程id，当前线程id为 3

除此之外，还可以使用

show processlist

查看当前MySQL 服务器上存在哪些连接：

mysql>show processlist\G
***************************1.row***************************
     Id: 3-- 当前线程idUser: root     -- 当前线程登录用户
   Host: localhost:65447-- 线程登录主机
     db: test     -- 线程使用数据库
Command: Query    -- 当前线程执行命令类型Time: 0
  State: starting-- 当前连接状态
   Info: show processlist  -- 当前连接执行SQL***************************2.row***************************
     Id: 4User: root
   Host: localhost:65431
     db: test
Command: Sleep
   Time: 405
  State:
   Info: NULL2rowsinset(0.00 sec)

MySQL 会为每个到来的连接新建一个线程

使用SQL可以查看当前都有哪些事务信息：

select*from information_schema.innodb_trx\G

示例：

mysql>select*from information_schema.innodb_trx\G
***************************1.row***************************
                    trx_id: 6274333-- 事务id
                 trx_state: RUNNING      -- 事务状态
               trx_started: 2022-10-1016:16:05-- 事务开始时间
     trx_requested_lock_id: NULL-- 事务请求锁定的 id
          trx_wait_started: NULL-- 事务是否处于等待状态
                trx_weight: 24637-- 事务大小
       trx_mysql_thread_id: 4-- 事务关联的 MySQL 线程id
                 trx_query: NULL
       trx_operation_state: NULL-- 事务操作状态
         trx_tables_in_use: 0-- 事务使用的表数量
         trx_tables_locked: 1-- 事务锁表数量
          trx_lock_structs: 24637-- 事务锁定结构体
     trx_lock_memory_bytes: 2597072-- 事务锁定内存大小,单位字节
           trx_rows_locked: 4598010-- 事务锁定行数
         trx_rows_modified: 0-- 事务修改行数
   trx_concurrency_tickets: 0
       trx_isolation_level: REPEATABLEREAD-- 当前事务隔离级别
         trx_unique_checks: 1-- 事务是否进行唯一约束检查
    trx_foreign_key_checks: 1-- 事务是否进行外键检查
trx_last_foreign_key_error: NULL
 trx_adaptive_hash_latched: 0-- 事务自适应哈希锁
 trx_adaptive_hash_timeout: 0
          trx_is_read_only: 0
trx_autocommit_non_locking: 01rowinset(0.00 sec)

可以看到当前获取到了一个事务的信息，对应的

trx_mysql_thread_id

表示这个事务所在的连接线程，当前为 4.

使用

start transaction WITH CONSISTENT SNAPSHOT

创建一个事务

使用

BEGIN

并不会立即创建一个事务，此时如果要验证事务我们可以使用

START TRANSACTION WITH CONSISTENT SNAPSHOT

强制启动一个事务。

mysql>STARTTRANSACTIONWITHCONSISTENTSNAPSHOT;
Query OK,0rows affected (0.00 sec)

查看 binlog 日志

如果 MySQL开启了 binlog，可以使用 MySQL服务器携带的

mysqlbinlog

命令查看binlog日志：

# 后面指定 binlog 文件
mysqlbinlog ./mysql-bin.000001
# 查看指定 binlong 文件# -vv 表示详细输出 v 越多输出内容越详细# --start-position 表示输出内容的起始位置
mysqlbinlog -vv data/master.000001 --start-position=8900;

在 mysql 命令行中查看：

-- 查看第一个binlog文件内容show binlog events;-- 查看指定 binlog 文件的内容show binlog events in'mysql-bin.000002';-- 查看当前正在写入的 binlog 文件show master status \G
-- 获取 binlog 文件列表showbinary logs;

查看存储引擎 InnoDB 状态

可以使用命令查看存储引擎状态，如果数据库最近发生过死锁，该命令可以看到发生死锁时系统的状态。

SHOWENGINEInnoDBSTATUS\G

示例

mysql>SHOWENGINEInnoDBSTATUS\G
***************************1.row***************************Type: InnoDB-- 引擎类型
  Name:
Status:
=====================================2022-10-2410:33:350x428cINNODB MONITOR OUTPUT -- 存储引擎监视器输出=====================================
Per second averages calculated from the last52 seconds
-----------------
BACKGROUND THREAD    -- 后台线程-----------------
srv_master_thread loops: 16 srv_active,0 srv_shutdown,219547 srv_idle   -- 伺服线程循环状态
srv_master_thread log flush and writes: 219563-- 伺服线程日志刷盘状态----------
SEMAPHORES -- 信号量----------
OS WAIT ARRAY INFO: reservation count 41-- 系统等待队列
OS WAIT ARRAY INFO: signal count 41
RW-shared spins 0, rounds 40, OS waits 20
RW-excl spins 0, rounds 54, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 40.00 RW-shared,54.00 RW-excl,0.00 RW-sx
------------TRANSACTIONS------------
Trx id counter 6276938Purge done for trxs n:o <6276935 undo n:o <0 state: running but idle
History list length 0
LIST OFTRANSACTIONSFOR EACH SESSION:
---TRANSACTION 283738590640792, not started0lock struct(s), heap size 1136,0rowlock(s)---TRANSACTION 6276935, ACTIVE 903 sec2lock struct(s), heap size 1136,7rowlock(s)
MySQL thread id 5, OS thread handle 5260, query id 87 localhost 127.0.0.1 root
--------FILE I/O
--------
I/O thread 0 state: wait Windows aio (insert buffer thread)
I/O thread 1 state: wait Windows aio (log thread)
I/O thread 2 state: wait Windows aio (read thread)
I/O thread 3 state: wait Windows aio (read thread)
I/O thread 4 state: wait Windows aio (read thread)
I/O thread 5 state: wait Windows aio (read thread)
I/O thread 6 state: wait Windows aio (write thread)
I/O thread 7 state: wait Windows aio (write thread)
I/O thread 8 state: wait Windows aio (write thread)
I/O thread 9 state: wait Windows aio (write thread)
Pending normal aio reads: [0,0,0,0], aio writes: [0,0,0,0],
 ibuf aio reads:, log i/o_s:, sync i/o_s:
Pending flushes (fsync) log: 0; buffer pool: 0612 OS filereads,359 OS file writes,152 OS fsyncs
0.00reads/s,0 avg bytes/read,0.00 writes/s,0.00 fsyncs/s
-------------------------------------INSERT BUFFER AND ADAPTIVE HASHINDEX-------------------------------------
Ibuf: size 1, free list len 0, seg size 2,0 merges
merged operations:
 insert0,delete mark 0,delete0
discarded operations:
 insert0,delete mark 0,delete0Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)Hashtable size 34679, node heap has 0 buffer(s)0.00hash searches/s,0.00 non-hash searches/s
---
LOG
---
Log sequence number 3153058970
Log flushed up to3153058970
Pages flushed up to3153058970Lastcheckpoint at  31530589610 pending log flushes,0 pending chkp writes
99 log i/o_s done,0.00 log i/o_s/second----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137297920
Dictionary memory allocated 191079
Buffer pool size   8192-- 内存中缓存池大小 单位为页
Free buffers       7566-- 空闲缓存数量Database pages     626-- 已缓存数据页数量 8192 = 7566 + 626
Old database pages 248
Modified db pages  0-- 已修改脏页数量
Pending reads0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0,not young 00.00 youngs/s,0.00 non-youngs/s
Pages read573, created 53, written 2280.00reads/s,0.00 creates/s,0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 626, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]--------------ROW OPERATIONS
--------------0 queries inside InnoDB,0 queries in queue
0read views open inside InnoDB
Process ID=5952, Main thread ID=8412, state: sleeping
Number ofrows inserted 27, updated 0, deleted 0,read2030.00 inserts/s,0.00 updates/s,0.00 deletes/s,0.00reads/s
----------------------------ENDOFINNODB MONITOR OUTPUT
============================1rowinset(0.00 sec)

标签： mysql 数据库 sql

本文转载自: https://blog.csdn.net/qq_19922839/article/details/127247332
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[笔记]MySQL查看事务信息

使用

查看 binlog 日志

查看存储引擎 InnoDB 状态

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