RR 无主键、无索引
无锁
mysql> show engine innodb status\G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2022-05-19 12:27:55 0x7f9215fb1700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 28 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5 srv_active, 0 srv_shutdown, 2921 srv_idle
srv_master_thread log flush and writes: 2926
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 10
OS WAIT ARRAY INFO: signal count 10
RW-shared spins 0, rounds 16, OS waits 8
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 16.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 5389
Purge done for trx's n:o < 5388 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421740909768336, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421740909767416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421740909766496, 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 (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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: 0
276 OS file reads, 138 OS file writes, 44 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 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 12668586
Log flushed up to 12668586
Pages flushed up to 12668586
Last checkpoint at 12668577
0 pending log flushes, 0 pending chkp writes
30 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137428992
Dictionary memory allocated 108034
Buffer pool size 8192
Free buffers 7880
Database pages 312
Old database pages 0
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 248, created 64, written 94
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: 312, 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=1, Main thread ID=140265486534400, state: sleeping
Number of rows inserted 99, updated 0, deleted 0, read 110
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 (0.00 sec)
临键锁
mysql> show engine innodb status \G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2022-05-19 12:09:54 0x7f9215fb1700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 1 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5 srv_active, 0 srv_shutdown, 1842 srv_idle
srv_master_thread log flush and writes: 1847
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 10
OS WAIT ARRAY INFO: signal count 10
RW-shared spins 0, rounds 16, OS waits 8
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 16.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 5389
Purge done for trx's n:o < 5388 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421740909768336, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421740909767416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 5388, ACTIVE 122 sec
2 lock struct(s), heap size 1136, 4 row lock(s)
MySQL thread id 2, OS thread handle 140265914947328, query id 34 localhost root
TABLE LOCK table `jiangzhou`.`t` trx id 5388 lock mode IX
RECORD LOCKS space id 31 page no 3 n bits 72 index GEN_CLUST_INDEX of table `jiangzhou`.`t` trx id 5388 lock_mode X
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000200; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b0110; asc ;;
3: len 4; hex 8000000a; asc ;;
4: len 20; hex 3130202020202020202020202020202020202020; asc 10 ;;
Record lock, heap no 3 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000201; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b011e; asc ;;
3: len 4; hex 80000014; asc ;;
4: len 20; hex 3230202020202020202020202020202020202020; asc 20 ;;
Record lock, heap no 4 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000202; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b012c; asc ,;;
3: len 4; hex 8000001e; asc ;;
4: len 20; hex 3330202020202020202020202020202020202020; asc 30 ;;
--------
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 (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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: 0
276 OS file reads, 138 OS file writes, 44 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 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 12668586
Log flushed up to 12668586
Pages flushed up to 12668586
Last checkpoint at 12668577
0 pending log flushes, 0 pending chkp writes
30 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137428992
Dictionary memory allocated 108034
Buffer pool size 8192
Free buffers 7880
Database pages 312
Old database pages 0
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 248, created 64, written 94
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 312, 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=1, Main thread ID=140265486534400, state: sleeping
Number of rows inserted 99, updated 0, deleted 0, read 110
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 (0.00 sec)
supremum;; 为了避免幻读
fff
mysql> show engine innodb status \G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2022-05-19 12:31:44 0x7f9215fb1700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5 srv_active, 0 srv_shutdown, 3150 srv_idle
srv_master_thread log flush and writes: 3155
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 10
OS WAIT ARRAY INFO: signal count 10
RW-shared spins 0, rounds 16, OS waits 8
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 16.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 5390
Purge done for trx's n:o < 5388 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421740909768336, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421740909767416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 5389, ACTIVE 43 sec
2 lock struct(s), heap size 1136, 4 row lock(s)
MySQL thread id 2, OS thread handle 140265914947328, query id 42 localhost root
TABLE LOCK table `jiangzhou`.`t` trx id 5389 lock mode IX
RECORD LOCKS space id 31 page no 3 n bits 72 index GEN_CLUST_INDEX of table `jiangzhou`.`t` trx id 5389 lock_mode X
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000200; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b0110; asc ;;
3: len 4; hex 8000000a; asc ;;
4: len 20; hex 3130202020202020202020202020202020202020; asc 10 ;;
Record lock, heap no 3 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000201; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b011e; asc ;;
3: len 4; hex 80000014; asc ;;
4: len 20; hex 3230202020202020202020202020202020202020; asc 20 ;;
Record lock, heap no 4 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 6; hex 000000000202; asc ;;
1: len 6; hex 000000001507; asc ;;
2: len 7; hex a70000011b012c; asc ,;;
3: len 4; hex 8000001e; asc ;;
4: len 20; hex 3330202020202020202020202020202020202020; asc 30 ;;
--------
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 (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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: 0
276 OS file reads, 138 OS file writes, 44 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 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 12668586
Log flushed up to 12668586
Pages flushed up to 12668586
Last checkpoint at 12668577
0 pending log flushes, 0 pending chkp writes
30 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137428992
Dictionary memory allocated 108034
Buffer pool size 8192
Free buffers 7880
Database pages 312
Old database pages 0
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 248, created 64, written 94
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 312, 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=1, Main thread ID=140265486534400, state: sleeping
Number of rows inserted 99, updated 0, deleted 0, read 113
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.07 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
1 row in set (0.00 sec)
会加临键锁 防止出现幻读
ff
gg
------------
TRANSACTIONS
------------
Trx id counter 5401
Purge done for trx's n:o < 5399 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421740909768336, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421740909767416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 5400, ACTIVE 17 sec
2 lock struct(s), heap size 1136, 1 row lock(s)
MySQL thread id 2, OS thread handle 140265914947328, query id 52 localhost root
TABLE LOCK table `jiangzhou`.`t2` trx id 5400 lock mode IX
RECORD LOCKS space id 32 page no 3 n bits 72 index PRIMARY of table `jiangzhou`.`t2` trx id 5400 lock_mode X locks rec but not gap
Record lock, heap no 2 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
0: len 4; hex 8000000a; asc ;;
1: len 6; hex 000000001512; asc ;;
2: len 7; hex b0000001240110; asc $ ;;
3: len 20; hex 3130202020202020202020202020202020202020; asc 10 ;;
