数据库版本：

mysql> select @@version;

+------------+

| @@version |

+------------+

| 5.7.26-log |

+------------+

事务隔离级别：

mysql> show variables like '%iso%';

+-----------------------+----------------+

| Variable_name | Value |

+-----------------------+----------------+

| transaction_isolation | READ-COMMITTED |

| tx_isolation | READ-COMMITTED |

+-----------------------+----------------+

会话一：关闭自动提交，锁定表中一行数据

mysql> set autocommit=0;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from sbtest1 where id=1 lock in share mode;

+----+------+-------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------+------+-------+-------+-------+-------+-------+-------+--------+--------+------+------+------+

| id | k | c | pad | name | name2 | name5 | name6 | name7 | name8 | name9 | name10 | name11 | c1 | c2 | c3 |

+----+------+-------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------+------+-------+-------+-------+-------+-------+-------+--------+--------+------+------+------+

| 1 | 5015 | 68487932199-96439406143-93774651418-41631865787-96406072701-20604855487-25459966574-28203206787-41238978918-19503783441 | 22195207048-70116052123-74140395089-76317954521-98694025897 | aa | bb | a | a | a | a | a | a | a | NULL | NULL | 0 |

+----+------+-------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------+------+-------+-------+-------+-------+-------+-------+--------+--------+------+------+------+

1 row in set (0.00 sec)

会话二：对该表做DDL操作

mysql> set autocommit=0;

Query OK, 0 rows affected (0.00 sec)

mysql> alter table sbtest1 add cc1 int;

会话三：显示事务在等待数据字典锁，但在innodb的锁信息表中并未给出锁堵塞信息

mysql> show processlist;

+-------+-----------------+--------------------+---------------+---------+---------+---------------------------------+---------------------------------+

| Id | User | Host | db | Command | Time | State | Info |

+-------+-----------------+--------------------+---------------+---------+---------+---------------------------------+---------------------------------+

| 1 | event_scheduler | localhost | NULL | Daemon | 1549348 | Waiting on empty queue | NULL |

| 39327 | root | 10.200.21.13:39600 | canal_manager | Sleep | 884 | | NULL |

| 39436 | root | localhost | sysbench_db | Query | 51 | Waiting for table metadata lock | alter table sbtest1 add cc1 int |

| 39465 | root | localhost | NULL | Query | 0 | starting | show processlist |

| 39506 | root | localhost | sysbench_db | Query | 6 | Waiting for table metadata lock | select * from sbtest1 |

| 39511 | root | localhost | sysbench_db | Sleep | 137 | | NULL |

+-------+-----------------+--------------------+---------------+---------+---------+---------------------------------+---------------------------------+

6 rows in set (0.00 sec)

mysql> select * from INNODB_TRX;

+-----------------+-----------+---------------------+-----------------------+------------------+------------+---------------------+-----------+---------------------+-------------------+-------------------+------------------+-----------------------+-----------------+-------------------+-------------------------+---------------------+-------------------+------------------------+----------------------------+---------------------------+---------------------------+------------------+----------------------------+

| trx_id | trx_state | trx_started | trx_requested_lock_id | trx_wait_started | trx_weight | trx_mysql_thread_id | trx_query | trx_operation_state | trx_tables_in_use | trx_tables_locked | trx_lock_structs | trx_lock_memory_bytes | trx_rows_locked | trx_rows_modified | trx_concurrency_tickets | trx_isolation_level | trx_unique_checks | trx_foreign_key_checks | trx_last_foreign_key_error | trx_adaptive_hash_latched | trx_adaptive_hash_timeout | trx_is_read_only | trx_autocommit_non_locking |

+-----------------+-----------+---------------------+-----------------------+------------------+------------+---------------------+-----------+---------------------+-------------------+-------------------+------------------+-----------------------+-----------------+-------------------+-------------------------+---------------------+-------------------+------------------------+----------------------------+---------------------------+---------------------------+------------------+----------------------------+

| 421422174436976 | RUNNING | 2019-11-15 09:38:10 | NULL | NULL | 2 | 39511 | NULL | NULL | 0 | 1 | 2 | 1136 | 1 | 0 | 0 | READ COMMITTED | 1 | 1 | NULL | 0 | 0 | 0 | 0 |

+-----------------+-----------+---------------------+-----------------------+------------------+------------+---------------------+-----------+---------------------+-------------------+-------------------+------------------+-----------------------+-----------------+-------------------+-------------------------+---------------------+-------------------+------------------------+----------------------------+---------------------------+---------------------------+------------------+----------------------------+

1 row in set (0.00 sec)

mysql> select * from INNODB_locks;

Empty set, 1 warning (0.00 sec)

mysql> select * from INNODB_LOCK_WAITS;

Empty set, 1 warning (0.00 sec)

mysql> show engine innodb status \G;

*************************** 1. row ***************************

Type: InnoDB

Name:

Status:

=====================================

2019-11-15 09:45:19 0x7f47c8d38700 INNODB MONITOR OUTPUT

=====================================

Per second averages calculated from the last 11 seconds

-----------------

BACKGROUND THREAD

-----------------

srv_master_thread loops: 3581 srv_active, 0 srv_shutdown, 1542568 srv_idle

srv_master_thread log flush and writes: 1546144

----------

SEMAPHORES

----------

OS WAIT ARRAY INFO: reservation count 30450

OS WAIT ARRAY INFO: signal count 19118

RW-shared spins 0, rounds 15075, OS waits 6862

RW-excl spins 0, rounds 433241, OS waits 12516

RW-sx spins 1169, rounds 35046, OS waits 873

Spin rounds per wait: 15075.00 RW-shared, 433241.00 RW-excl, 29.98 RW-sx

------------------------

LATEST DETECTED DEADLOCK

------------------------

2019-11-14 09:55:27 0x7f47c8a20700

*** (1) TRANSACTION:

TRANSACTION 8801, ACTIVE 1 sec starting index read

mysql tables in use 1, locked 1

LOCK WAIT 4 lock struct(s), heap size 1136, 3 row lock(s), undo log entries 2

MySQL thread id 16018, OS thread handle 139946286548736, query id 99910 10.138.61.12 root updating

DELETE FROM sbtest1 WHERE id=4999

*** (1) WAITING FOR THIS LOCK TO BE GRANTED:

RECORD LOCKS space　　　　 not gap waiting

Record lock, heap no 73 PHYSICAL RECORD: n_fields 6; compact format; info bits 0

0: len 4; hex 80001387; asc ;;

1: len 6; hex 00000000225b; asc "[;;

2: len 7; hex 2e000000201fdb; asc . ;;

3: len 4; hex 80001375; asc u;;

4: len 30; hex 36323536333834383835322d34313830333137393631382d383536313634; asc 62563848852-41803179618-856164; (total 120 bytes);

5: len 30; hex 33303032343434313836392d36363935353436363130382d323939353039; asc 30024441869-66955466108-299509; (total 60 bytes);

*** (2) TRANSACTION:

TRANSACTION 8795, ACTIVE 1 sec starting index read, thread declared inside InnoDB 5000

mysql tables in use 1, locked 1

4 lock struct(s), heap size 1136, 3 row lock(s), undo log entries 2

MySQL thread id 16017, OS thread handle 139946285467392, query id 99920 10.138.61.12 root updating

DELETE FROM sbtest1 WHERE id=4979

*** (2) HOLDS THE LOCK(S):

RECORD LOCKS space id 57 page no 100 n bits 144 index PRIMARY of table `sysbench_db`.`sbtest1` trx id 8795 lock_mode X locks rec but not gap

Record lock, heap no 73 PHYSICAL RECORD: n_fields 6; compact format; info bits 0

0: len 4; hex 80001387; asc ;;

1: len 6; hex 00000000225b; asc "[;;

2: len 7; hex 2e000000201fdb; asc . ;;

3: len 4; hex 80001375; asc u;;

4: len 30; hex 36323536333834383835322d34313830333137393631382d383536313634; asc 62563848852-41803179618-856164; (total 120 bytes);

5: len 30; hex 33303032343434313836392d36363935353436363130382d323939353039; asc 30024441869-66955466108-299509; (total 60 bytes);

*** (2) WAITING FOR THIS LOCK TO BE GRANTED:

RECORD LOCKS space id 57 page no 100 n bits 144 index PRIMARY of table `sysbench_db`.`sbtest1` trx id 8795 lock_mode X locks rec but not gap waiting

Record lock, heap no 53 PHYSICAL RECORD: n_fields 6; compact format; info bits 0

0: len 4; hex 80001373; asc s;;

1: len 6; hex 000000002261; asc "a;;

2: len 7; hex 310000001f2239; asc 1 "9;;

3: len 4; hex 800013aa; asc ;;

4: len 30; hex 31333735393532343036322d37383433393531343532342d383137393338; asc 13759524062-78439514524-817938; (total 120 bytes);

5: len 30; hex 34353737383233343435352d38303336313338353035392d383834323633; asc 45778234455-80361385059-884263; (total 60 bytes);

*** WE ROLL BACK TRANSACTION (2)

------------

TRANSACTIONS

------------

Trx id counter 2258851

Purge done for trx's n:o < 2258850 undo n:o < 0 state: running but idle

History list length 49

LIST OF TRANSACTIONS FOR EACH SESSION:

---TRANSACTION 421422174438800, not started

0 lock struct(s), heap size 1136, 0 row lock(s)

---TRANSACTION 421422174437888, not started

0 lock struct(s), heap size 1136, 0 row lock(s)

---TRANSACTION 421422174436064, not started

0 lock struct(s), heap size 1136, 0 row lock(s)

---TRANSACTION 421422174435152, not started

0 lock struct(s), heap size 1136, 0 row lock(s)

--------

FILE I/O

--------

I/O thread 0 state: waiting for completed aio requests (insert buffer thread)

I/O thread 1 state: waiting for completed aio requests (log thread)

I/O thread 2 state: waiting for completed aio requests (read thread)

I/O thread 3 state: waiting for completed aio requests (read thread)

I/O thread 4 state: waiting for completed aio requests (read thread)

I/O thread 5 state: waiting for completed aio requests (read thread)

I/O thread 6 state: waiting for completed aio requests (read thread)

I/O thread 7 state: waiting for completed aio requests (read thread)

I/O thread 8 state: waiting for completed aio requests (read thread)

I/O thread 9 state: waiting for completed aio requests (read thread)

I/O thread 10 state: waiting for completed aio requests (write thread)

I/O thread 11 state: waiting for completed aio requests (write thread)

I/O thread 12 state: waiting for completed aio requests (write thread)

I/O thread 13 state: waiting for completed aio requests (write thread)

I/O thread 14 state: waiting for completed aio requests (write thread)

I/O thread 15 state: waiting for completed aio requests (write thread)

I/O thread 16 state: waiting for completed aio requests (write thread)

I/O thread 17 state: waiting for completed aio requests (write thread)

Pending normal aio reads: [0, 0, 0, 0, 0, 0, 0, 0] , aio writes: [0, 0, 0, 0, 0, 0, 0, 0] ,

ibuf aio reads:, log i/o's:, sync i/o's:

Pending flushes (fsync) log: 0; buffer pool: 0

613084 OS file reads, 1249482 OS file writes, 643052 OS fsyncs

0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s

-------------------------------------

INSERT BUFFER AND ADAPTIVE HASH INDEX

-------------------------------------

Ibuf: size 1, free list len 126, seg size 128, 20513 merges

merged operations:

insert 124338, delete mark 486, delete 0

discarded operations:

insert 35606, delete mark 359, delete 0

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 1 buffer(s)

Hash table size 34679, node heap has 231 buffer(s)

0.00 hash searches/s, 0.00 non-hash searches/s

---

LOG

---

Log sequence number 1625718660

Log flushed up to 1625718660

Pages flushed up to 1625718660

Last checkpoint at 1625718651

0 pending log flushes, 0 pending chkp writes

585541 log i/o's done, 0.00 log i/o's/second

----------------------

BUFFER POOL AND MEMORY

----------------------

Total large memory allocated 137428992

Dictionary memory allocated 264434

Buffer pool size 8192

Free buffers 4096

Database pages 3858

Old database pages 1404

Modified db pages 0

Pending reads 0

Pending writes: LRU 0, flush list 0, single page 0

Pages made young 51385, not young 13979456

0.00 youngs/s, 0.00 non-youngs/s

Pages read 612973, created 365347, written 614329

0.00 reads/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: 3858, 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

0 read views open inside InnoDB

Process ID=2589, Main thread ID=139946660714240, state: sleeping

Number of rows inserted 8673974, updated 7522, deleted 3147, read 45773008

0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s

----------------------------

END OF INNODB MONITOR OUTPUT

============================

1 row in set (0.09 sec)

ERROR:

No query specified

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