Mecanismos de armazenamento

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variáveis | Pool de buffer | Estado do InnoDB ]

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2026-01-18 10:15:23 0x15e4 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 26 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6555 srv_active, 0 srv_shutdown, 835366 srv_idle
srv_master_thread log flush and writes: 841921
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 115948
OS WAIT ARRAY INFO: signal count 12904
RW-shared spins 7926, rounds 226312, OS waits 7186
RW-excl spins 1241, rounds 9531, OS waits 146
RW-sx spins 62, rounds 890, OS waits 12
Spin rounds per wait: 28.55 RW-shared, 7.68 RW-excl, 14.35 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2026-01-13 12:20:43 0x478 Transaction:
TRANSACTION 764254, ACTIVE 0 sec updating or deleting
mysql tables in use 1, locked 1
8 lock struct(s), heap size 1128, 4 row lock(s), undo log entries 1
MySQL thread id 1681, OS thread handle 1144, query id 36230 localhost 127.0.0.1 root Updating
UPDATE `vrp`.`vrp_users` SET `id`=1 WHERE  `id`=3
Foreign key constraint fails for table `vrp`.`vrp_user_ids`:
,
  CONSTRAINT `fk_user_ids_users` FOREIGN KEY (`user_id`) REFERENCES `vrp_users` (`id`) ON DELETE CASCADE
Trying to update in parent table, in index PRIMARY tuple:
DATA TUPLE: 7 fields;
 0: len 4; hex 80000003; asc     ;;
 1: len 6; hex 0000000ba95e; asc      ^;;
 2: len 7; hex 43000001ab165c; asc C     \;;
 3: len 0; hex ; asc ;;
 4: len 0; hex ; asc ;;
 5: len 1; hex 81; asc  ;;
 6: len 1; hex 80; asc  ;;

But in child table `vrp`.`vrp_user_ids`, in index fk_user_ids_users, there is a record:
PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 4; hex 80000003; asc     ;;
 1: len 30; hex 6c6963656e7365323a623038633637346665323436333337623361393263; asc license2:b08c674fe246337b3a92c; (total 49 bytes);

------------
TRANSACTIONS
------------
Trx id counter 784786
Purge done for trx's n:o < 784786 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283436979749152, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283436979744984, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283436979740816, 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
18955 OS file reads, 67012 OS file writes, 35469 OS fsyncs
0.46 reads/s, 16384 avg bytes/read, 2.00 writes/s, 0.88 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)
1.31 hash searches/s, 2.00 non-hash searches/s
---
LOG
---
Log sequence number 74636270
Log flushed up to   74636270
Pages flushed up to 74636270
Last checkpoint at  74636261
0 pending log flushes, 0 pending chkp writes
23525 log i/o's done, 0.54 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 565904
Buffer pool size   1003
Free buffers       739
Database pages     256
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 144, not young 1860
0.00 youngs/s, 0.00 non-youngs/s
Pages read 18769, created 1149, written 39219
0.46 reads/s, 0.00 creates/s, 1.35 writes/s
Buffer pool hit rate 963 / 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: 256, unzip_LRU len: 0
I/O sum[71]: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=3104, Main thread ID=4340, state: sleeping
Number of rows inserted 830, updated 6806, deleted 93, read 83390
0.00 inserts/s, 0.19 updates/s, 0.00 deletes/s, 1.04 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 14267
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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