??????MySQL????ID

???????????? ???????[ 2013/4/26 11:10:37 ] ????????

????????????????????????????????????ID?????KILL???????е????????????? ????????????????????????????????ID??? MySQL ??????????????????????????????y???? ??????????????????

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???????A???????????????Щ??????????????????????????????????? ??????????????????????????????SLEEP????

    mysql> set @@autocommit=0;
    Query OK?? 0 rows affected (0.00 sec)
    mysql> use test;
    Reading table information for completion of table and column names
    You can turn off this feature to get a quicker startup with -A
    Database changed
    mysql> show tables;
    +----------------+
    | Tables_in_test |
    +----------------+
    | demo_test      |
    | t3             |
    +----------------+
    2 rows in set (0.00 sec)
    mysql> select * from t3;
    +----+--------+--------+------------+----+----+----+
    | id | fname | lname | birthday   | c1 | c2 | c3 |
    +----+--------+--------+------------+----+----+----+
    | 19 | lily19 | lucy19 | 2013-04-18 | 19 | 0 | 0 |
    | 20 | lily20 | lucy20 | 2013-03-13 | 20 | 0 | 0 |
    +----+--------+--------+------------+----+----+----+
    2 rows in set (0.00 sec)
    mysql> update t3 set birthday = '2022-02-23' where id = 19;
    Query OK?? 1 row affected (0.00 sec)
    Rows matched: 1 Changed: 1 Warnings: 0
    mysql> select connection_id();
    +-----------------+
    | connection_id() |
    +-----------------+
    |              16 |
    +-----------------+
    1 row in set (0.00 sec)
    mysql>

???????B?????????????????????￡????????????????????????????????????м???????????

    mysql> use test;
    Reading table information for completion of table and column names
    You can turn off this feature to get a quicker startup with -A
    Database changed
    mysql> select @@autocommit;
    +--------------+
    | @@autocommit |
    +--------------+
    |            1 |
    +--------------+
    1 row in set (0.00 sec)
    mysql> update t3 set birthday='2018-01-03' where id = 19;
    ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
    mysql> select connection_id();
    +-----------------+
    | connection_id() |
    +-----------------+
    |              17 |
    +-----------------+
    1 row in set (0.00 sec)
    mysql> show processlist;
    +----+------+-----------+------+---------+------+-------+------------------+
    | Id | User | Host      | db   | Command | Time | State | Info             |
    +----+------+-----------+------+---------+------+-------+------------------+
    | 10 | root | localhost | NULL | Sleep   | 1540 |       | NULL             |
    | 11 | root | localhost | NULL | Sleep   | 722 |       | NULL             |
    | 16 | root | localhost | test | Sleep   | 424 |       | NULL             |
    | 17 | root | localhost | test | Query   |    0 | init | show processlist |
    | 18 | root | localhost | NULL | Sleep   |    5 |       | NULL             |
    +----+------+-----------+------+---------+------+-------+------------------+
    5 rows in set (0.00 sec)
    mysql> show engine innodb statusG
    ------------
    TRANSACTIONS
    ------------
    Trx id counter 189327
    Purge done for trx's n:o < 189323 undo n:o < 0 state: running but idle
    History list length 343
    LIST OF TRANSACTIONS FOR EACH SESSION:
    ---TRANSACTION 0?? not started
    MySQL thread id 11?? OS thread handle 0x7f70a0c98700?? query id 994 localhost root init
    show engine innodb status
    ---TRANSACTION 189326?? ACTIVE 2 sec starting index read
    mysql tables in use 1?? locked 1
    LOCK WAIT 2 lock struct(s)?? heap size 376?? 1 row lock(s)
    MySQL thread id 17?? OS thread handle 0x7f70a0bd5700?? query id 993 localhost root updating
    update t3 set birthday='2018-01-03' where id = 19
    ------- TRX HAS BEEN WAITING 2 SEC FOR THIS LOCK TO BE GRANTED:
    RECORD LOCKS space id 529 page no 3 n bits 72 index `PRIMARY` of table `test`.`t3` trx id 189326 lock_mode X waiting
    Record lock?? heap no 2 PHYSICAL RECORD: n_fields 9; compact format; info bits 0
     0: len 2; hex 3139; asc 19;;
     1: len 6; hex 00000002e38c; asc       ;;
     2: len 7; hex 7e00000d2827c9; asc ~   (' ;;
     3: len 6; hex 6c696c793139; asc lily19;;
     4: len 6; hex 6c7563793139; asc lucy19;;
     5: len 3; hex 8fcc57; asc   W;;
     6: len 4; hex 80000013; asc     ;;
     7: len 4; hex 80000000; asc     ;;
     8: len 4; hex 80000000; asc     ;;
    ------------------
    ---TRANSACTION 189324?? ACTIVE 641 sec
    2 lock struct(s)?? heap size 376?? 3 row lock(s)?? undo log entries 1
    MySQL thread id 16?? OS thread handle 0x7f70a0b94700?? query id 985 localhost root cleaning up
    Trx read view will not see trx with id >= 189325?? sees < 189325

???????????????????????????????????????

?????????????????????????????????ó??????????OK???

    mysql> SELECT * FROM information_schema.INNODB_TRXG
    *************************** 1. row ***************************
                        trx_id: 189324
                     trx_state: RUNNING
                   trx_started: 2013-04-18 17:48:14
         trx_requested_lock_id: NULL
              trx_wait_started: NULL
                    trx_weight: 3
           trx_mysql_thread_id: 16
                     trx_query: NULL
           trx_operation_state: NULL
             trx_tables_in_use: 0
             trx_tables_locked: 0
              trx_lock_structs: 2
         trx_lock_memory_bytes: 376
               trx_rows_locked: 3
             trx_rows_modified: 1
       trx_concurrency_tickets: 0
           trx_isolation_level: REPEATABLE READ
             trx_unique_checks: 1
        trx_foreign_key_checks: 1
    trx_last_foreign_key_error: NULL
     trx_adaptive_hash_latched: 0
     trx_adaptive_hash_timeout: 10000
              trx_is_read_only: 0
    trx_autocommit_non_locking: 0
    1 row in set (0.01 sec)
    mysql>