mysql?Ver?14.14?Distrib?5.7.16,?for?linux-glibc2.5?(x86_64)?using?EditLine?wrapper?#mysql版本?5.7.16

Connection?id:?10042

Current?database:?china9129

Current?user:?root@localhost

SSL:?Not?in?use

Current?pager:?stdout

Using?outfile:?''

Using?delimiter:?;

Server?version:?5.7.16-log?MySQL?Community?Server?(GPL)

Protocol?version:?10

Connection:?Localhost?via?UNIX?socket

Server?characterset:?utf8

Db?characterset:?utf8

Client?characterset:?utf8

Conn.?characterset:?utf8

UNIX?socket:?/data/mysql/mysql9129/sock/mysql9129.sock

Uptime:?4?days?6?hours?2?min?31?sec

Threads:?4?Questions:?31133?Slow?queries:?0?Opens:?254?Flush?tables:?3?Open?tables:?58?Queries?per?second?avg:?0.084

SESSION?1:

"root@localhost:mysql9129.sock?[(none)]>set?global?TRANSACTION?ISOLATION?LEVEL?REPEATABLE?READ;

"root@localhost:mysql9129.sock?[(none)]>select?@@tx_isolation;

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

|?@@tx_isolation?|

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

|?REPEATABLE-READ?|

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

1?row?in?set?(0.00?sec)

"root@localhost:mysql9129.sock?[china9129]>show?create?table?t100;

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

|?Table?|?Create?Table?|

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

|?t100?|?CREATE?TABLE?`t100`?(

`id`?int(11)?NOT?NULL,

PRIMARY?KEY?(`id`)

)?ENGINE=InnoDB?DEFAULT?CHARSET=utf8?|

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

1?row?in?set?(0.00?sec)

"root@localhost:mysql9129.sock?[china9129]>select?*?from?t100;

+-----+

|?id?|

+-----+

|?1?|

|?2?|

|?3?|

|?4?|

|?5?|

|?111?|

+-----+

"root@localhost:mysql9129.sock?[china9129]>begin;

Query?OK,?0?rows?affected?(0.00?sec)

"root@localhost:mysql9129.sock?[china9129]>select?*?from?t100?where?id=5?for?update;

+----+

|?id?|

+----+

|?5?|

+----+

1?row?in?set?(0.00?sec)

"root@localhost:mysql9129.sock?[china9129]>delete?from?t100?where?id?=3;

Query?OK,?1?row?affected?(3.62?sec)

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

SESSION?2:

"root@localhost:mysql9129.sock?[(none)]>begin;

Query?OK,?0?rows?affected?(0.00?sec)

"root@localhost:mysql9129.sock?[(none)]>use?china9129;

Database?changed

"root@localhost:mysql9129.sock?[china9129]>select?*?from?t100?where?id=3?for?update;

+----+

|?id?|

+----+

|?3?|

+----+

1?row?in?set?(0.00?sec)

"root@localhost:mysql9129.sock?[china9129]>delete?from?t100?where?id?=5;

ERROR?1213?(40001):?Deadlock?found?when?trying?to?get?lock;?try?restarting?transaction

#查看死鎖信息

"root@localhost:mysql9129.sock?[china9129]>show?engine?innodb?status?\G

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

Type:?InnoDB

Name:

Status:

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

2016-12-20?21:57:45?0x7fa0bffff700?INNODB?MONITOR?OUTPUT

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

Per?second?averages?calculated?from?the?last?24?seconds

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

BACKGROUND?THREAD

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

srv_master_thread?loops:?1133?srv_active,?0?srv_shutdown,?362529?srv_idle

srv_master_thread?log?flush?and?writes:?363662

----------

SEMAPHORES

----------

OS?WAIT?ARRAY?INFO:?reservation?count?4540

OS?WAIT?ARRAY?INFO:?signal?count?5766

RW-shared?spins?0,?rounds?4683,?OS?waits?474

RW-excl?spins?0,?rounds?134731,?OS?waits?1327

RW-sx?spins?6332,?rounds?138603,?OS?waits?2382

Spin?rounds?per?wait:?4683.00?RW-shared,?134731.00?RW-excl,?21.89?RW-sx

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

LATEST?DETECTED?DEADLOCK?#監測出最近的死鎖信息

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

2016-12-20?21:56:29?0x7fa0bffff700

***?(1)?TRANSACTION:?#第一個事物

TRANSACTION?13899,?ACTIVE?51?sec?starting?index?read?#事物id?13899，活躍了51秒

mysql?tables?in?use?1,?locked?1?#mysql有一個表在使用，一個表被鎖住

LOCK?WAIT?3?lock?struct(s),?heap?size?1136,?2?row?lock(s)?#有3個鎖鏈表，內存中堆的大小1136,?兩行記錄被鎖定

MySQL?thread?id?10041,?OS?thread?handle?140330009478912,?query?id?31128?localhost?root?updating

#mysql線程id?10041,?query?id?31128,?localhost?root用戶執行update操作

delete?from?t100?where?id?=3?#執行了這個SQL語句的時候，發生了鎖等待

***?(1)?WAITING?FOR?THIS?LOCK?TO?BE?GRANTED:?#等待這個鎖被釋放

RECORD?LOCKS?space?id?74?page?no?3?n?bits?80?index?PRIMARY?of?table?`china9129`.`t100`?trx?id?13899?lock_mode?X?locks?rec?but?not?gap?waiting

#類型：行鎖，等待在t100的主鍵上?page?num?3，加一個X鎖(not?gap?waiting)，鎖住80?bits。

Record?lock,?heap?no?5?PHYSICAL?RECORD:?n_fields?3;?compact?format;?info?bits?0

0:?len?4;?hex?80000003;?asc?;;

1:?len?6;?hex?00000000363b;?asc?6;;;

2:?len?7;?hex?c7000001660110;?asc?f?;;

***?(2)?TRANSACTION:#第二個事物

TRANSACTION?13900,?ACTIVE?31?sec?starting?index?read?#事物id?13900，活躍了31秒

mysql?tables?in?use?1,?locked?1?#mysql有一個表在使用，一個表被鎖住

3?lock?struct(s),?heap?size?1136,?2?row?lock(s)?#有3個鎖鏈表，內存中堆的大小1136,?兩行記錄被鎖定

MySQL?thread?id?10042,?OS?thread?handle?140328392718080,?query?id?31129?localhost?root?updating

#mysql線程id?10042,?query?id?31129,?localhost?root用戶執行update操作

delete?from?t100?where?id?=5?#執行了這個SQL語句的時候，發生了鎖等待

***?(2)?HOLDS?THE?LOCK(S):?#事物?13900?持有的鎖

RECORD?LOCKS?space?id?74?page?no?3?n?bits?80?index?PRIMARY?of?table?`china9129`.`t100`?trx?id?13900?lock_mode?X?locks?rec?but?not?gap

#類型：行鎖，事物?id?13900，在t100的主鍵上?page?num?3，加一個X鎖(not?gap?沒有間隙鎖)，鎖住80?bits

Record?lock,?heap?no?5?PHYSICAL?RECORD:?n_fields?3;?compact?format;?info?bits?0

0:?len?4;?hex?80000003;?asc?;;

1:?len?6;?hex?00000000363b;?asc?6;;;

2:?len?7;?hex?c7000001660110;?asc?f?;;

***?(2)?WAITING?FOR?THIS?LOCK?TO?BE?GRANTED:?#當事物2在執行delete?from?t100?where?id?=5的時候，發生鎖等待

RECORD?LOCKS?space?id?74?page?no?3?n?bits?80?index?PRIMARY?of?table?`china9129`.`t100`?trx?id?13900?lock_mode?X?locks?rec?but?not?gap?waiting

#類型：行鎖，等待在t100的主鍵上?page?num?3，加一個X鎖(not?gap?waiting?沒有間隙鎖)，鎖住80?bits。

Record?lock,?heap?no?7?PHYSICAL?RECORD:?n_fields?3;?compact?format;?info?bits?0

0:?len?4;?hex?80000005;?asc?;;

1:?len?6;?hex?00000000363d;?asc?6=;;

2:?len?7;?hex?c90000014c0110;?asc?L?;;

***?WE?ROLL?BACK?TRANSACTION?(2)

#事物2，TRANSACTION?13900被回滾了。報錯信息：ERROR?1213?(40001):?Deadlock?found?when?trying?to?get?lock;?try?restarting?transaction

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

TRANSACTIONS

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

Trx?id?counter?13905

Purge?done?for?trx's?n:o?

History?list?length?568

LIST?OF?TRANSACTIONS?FOR?EACH?SESSION:

---TRANSACTION?421807334705888,?not?started

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

---TRANSACTION?13899,?ACTIVE?127?sec

3?lock?struct(s),?heap?size?1136,?2?row?lock(s),?undo?log?entries?1

MySQL?thread?id?10041,?OS?thread?handle?140330009478912,?query?id?31128?localhost?root?cleaning?up

-------

備注:

(1)?在MySQL中，行級鎖并不是直接鎖記錄，而是鎖索引。索引分為主鍵索引和非主鍵索引兩種，如果一條sql語句操作了

主鍵索引，MySQL就會鎖定這條主鍵索引；如果一?條語句操作了非主鍵索引，MySQL會先鎖定該非主鍵索引，再鎖定相關的主鍵索引。

在UPDATE、DELETE操作時，MySQL不僅鎖定WHERE條件掃描過的所有索引記錄，而且會鎖定相鄰的鍵值，即所謂的next-key?locking

(2)?把死鎖信息寫入到error.log。

set?global?innodb_print_all_deadlocks?=?1;

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