Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
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2026-01-27 12:14:55 0x2728 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 7866 srv_active, 0 srv_shutdown, 2015250 srv_idle
srv_master_thread log flush and writes: 2023116
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 812468
OS WAIT ARRAY INFO: signal count 135276
RW-shared spins 9813, rounds 285094, OS waits 8090
RW-excl spins 4864, rounds 21568, OS waits 339
RW-sx spins 38, rounds 589, OS waits 8
Spin rounds per wait: 29.05 RW-shared, 4.43 RW-excl, 15.50 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2026-01-26 20:06:37 0xefc Transaction:
TRANSACTION 1448285, ACTIVE 0 sec updating or deleting
mysql tables in use 1, locked 1
4 lock struct(s), heap size 1128, 2 row lock(s), undo log entries 1
MySQL thread id 1499, OS thread handle 3836, query id 316648 localhost ::1 root Updating
DELETE FROM `backup`.`account` WHERE `id` = 11
Foreign key constraint fails for table `backup`.`player`:
,
CONSTRAINT `player_ibfk_1` FOREIGN KEY (`account_id`) REFERENCES `account` (`id`)
Trying to delete or update in parent table, in index PRIMARY tuple:
DATA TUPLE: 61 fields;
0: len 4; hex 8000000b; asc ;;
1: len 6; hex 00000016195d; asc ];;
2: len 7; hex 6a000001a92fac; asc j / ;;
3: len 4; hex 74657374; asc test;;
4: len 8; hex 61646d696e393873; asc admin98s;;
5: len 0; hex ; asc ;;
6: len 4; hex 697719a8; asc iw ;;
7: len 4; hex 6977517f; asc iwQ ;;
8: len 2; hex 8000; asc ;;
9: len 4; hex 80000000; asc ;;
10: len 4; hex 80000000; asc ;;
11: len 4; hex 7fffffff; asc ;;
12: len 1; hex 81; asc ;;
13: len 4; hex 6977514a; asc iwQJ;;
14: len 4; hex 69775170; asc iwQp;;
15: len 12; hex 32372e37312e3132312e3531; asc 27.71.121.51;;
16: len 4; hex 80000000; asc ;;
17: len 4; hex 80000000; asc ;;
18: len 4; hex 7fffffff; asc ;;
19: len 8; hex 000000000000f03f; asc ?;;
20: len 1; hex 80; asc ;;
21: len 1; hex 30; asc 0;;
22: SQL NULL;
23: len 4; hex 80000000; asc ;;
24: len 4; hex 80000000; asc ;;
25: len 4; hex 80000000; asc ;;
26: len 4; hex 80000000; asc ;;
27: SQL NULL;
28: len 4; hex 80000000; asc ;;
29: len 4; hex 80000000; asc ;;
30: len 4; hex 80000000; asc ;;
31: len 4; hex 80000000; asc ;;
32: len 4; hex 80000000; asc ;;
33: len 4; hex 80000000; asc ;;
34: len 4; hex 80000000; asc ;;
35: len 4; hex 80000000; asc ;;
36: len 4; hex 80000000; asc ;;
37: len 4; hex 80000000; asc ;;
38: len 4; hex 80000000; asc ;;
39: len 4; hex 80000000; asc ;;
40: len 4; hex 80000000; asc ;;
41: len 4; hex 80000000; asc ;;
42: len 4; hex 80000000; asc ;;
43: len 4; hex 80000000; asc ;;
44: len 4; hex 80000000; asc ;;
45: len 4; hex 80000000; asc ;;
46: len 4; hex 80000000; asc ;;
47: len 4; hex 80000000; asc ;;
48: len 4; hex 80000000; asc ;;
49: len 4; hex 80000000; asc ;;
50: SQL NULL;
51: SQL NULL;
52: len 4; hex 80000000; asc ;;
53: len 8; hex 8000000000000000; asc ;;
54: len 4; hex 80000000; asc ;;
55: len 4; hex 80000004; asc ;;
56: SQL NULL;
57: len 4; hex 80000000; asc ;;
58: SQL NULL;
59: SQL NULL;
60: len 4; hex 80000000; asc ;;
But in child table `backup`.`player`, in index account_id, there is a record:
PHYSICAL RECORD: n_fields 2; compact format; info bits 0
0: len 4; hex 8000000b; asc ;;
1: len 4; hex 8000000b; asc ;;
------------
TRANSACTIONS
------------
Trx id counter 3008437
Purge done for trx's n:o < 3008417 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 281877045608808, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 281877045621312, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 281877045612976, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 281877045604640, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 281877045596304, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 281877045600472, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
37235 OS file reads, 274086 OS file writes, 105083 OS fsyncs
0.22 reads/s, 16384 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 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
8.67 hash searches/s, 10.78 non-hash searches/s
---
LOG
---
Log sequence number 172440097
Log flushed up to 172440097
Pages flushed up to 172440097
Last checkpoint at 172440088
0 pending log flushes, 0 pending chkp writes
71481 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 280448
Buffer pool size 1003
Free buffers 735
Database pages 260
Old database pages 0
Modified db pages 0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 119, not young 14158
0.00 youngs/s, 0.00 non-youngs/s
Pages read 37140, created 3403, written 189372
0.22 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 995 / 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: 260, unzip_LRU len: 0
I/O sum[2]: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=3152, Main thread ID=4168, state: sleeping
Number of rows inserted 30724, updated 45942, deleted 868, read 3743869
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 19.33 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1552
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
