Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-06-26 21:49:47 0x3584 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 20 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 130821 srv_active, 0 srv_shutdown, 2800287 srv_idle
srv_master_thread log flush and writes: 2931108
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 12143447
OS WAIT ARRAY INFO: signal count 8773035
RW-shared spins 8806195, rounds 233604025, OS waits 7093958
RW-excl spins 5678471, rounds 11161778, OS waits 142118
RW-sx spins 119464, rounds 1309380, OS waits 25436
Spin rounds per wait: 26.53 RW-shared, 1.97 RW-excl, 10.96 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2025-06-24 16:23:22 0x2fc0 Transaction:
TRANSACTION 30381923, 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 1866100, OS thread handle 12224, query id 29254634 localhost 127.0.0.1 root Updating
DELETE FROM `videos` WHERE `videos`.`id` = 64 LIMIT 1
Foreign key constraint fails for table `freelumatv`.`video_characters`:
,
  CONSTRAINT `video_characters_ibfk_1` FOREIGN KEY (`video_id`) REFERENCES `videos` (`id`)
Trying to delete or update in parent table, in index PRIMARY tuple:
DATA TUPLE: 13 fields;
 0: len 4; hex 80000040; asc    @;;
 1: len 6; hex 000001cf9763; asc      c;;
 2: len 7; hex 10000001b91257; asc       W;;
 3: len 4; hex 80000001; asc     ;;
 4: len 4; hex 80000001; asc     ;;
 5: len 63; hex 5468652056616e697368696e67206f662052616368656c2053696e636c6169723a2041204368696c6c696e6720536d616c6c20546f776e204d797374657279; asc The Vanishing of Rachel Sinclair: A Chilling Small Town Mystery;;
 6: SQL NULL;
 7: len 156; hex 446973617070656172616e636520696e2042726f6164204461796c696768742c2054686520546f776e2054686174204b6565707320536563726574732c20556e636f766572696e67207468652054727574683a2052616368656c2053696e636c6169722c204d79737465727920696e204d61706c65776f6f642c20412043617365205468617420426166666c656420496e76657374696761746f7273; asc Disappearance in Broad Daylight, The Town That Keeps Secrets, Uncovering the Truth: Rachel Sinclair, Mystery in Maplewood, A Case That Baffled Investigators;;
 8: len 1; hex 01; asc  ;;
 9: SQL NULL;
 10: SQL NULL;
 11: len 5; hex 99b6f0fb8c; asc      ;;
 12: len 49; hex 457863657074696f6e3a20496d61676520626173653634206e6f742072657475726e656420666f72207363656e6520302e; asc Exception: Image base64 not returned for scene 0.;;

But in child table `freelumatv`.`video_characters`, in index video_id, there is a record:
PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 4; hex 80000040; asc    @;;
 1: len 4; hex 800000a9; asc     ;;

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TRANSACTIONS
------------
Trx id counter 30399285
Purge done for trx's n:o < 30399285 undo n:o < 0 state: running but idle
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283725376028888, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283725376024720, 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
440076659 OS file reads, 9257421 OS file writes, 4921953 OS fsyncs
0.05 reads/s, 16384 avg bytes/read, 0.50 writes/s, 0.45 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 353, seg size 355, 78003 merges
merged operations:
 insert 739546, delete mark 1325442, delete 92367
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 2 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)
0.50 hash searches/s, 1.00 non-hash searches/s
---
LOG
---
Log sequence number 3416198505
Log flushed up to   3416198505
Pages flushed up to 3416198505
Last checkpoint at  3416198496
0 pending log flushes, 0 pending chkp writes
4179674 log i/o's done, 0.30 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 307992
Buffer pool size   1003
Free buffers       738
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 676091999, not young 4003730414
0.00 youngs/s, 0.00 non-youngs/s
Pages read 440076588, created 111505, written 4831097
0.05 reads/s, 0.00 creates/s, 0.15 writes/s
Buffer pool hit rate 980 / 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[12]: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=7404, Main thread ID=7916, state: sleeping
Number of rows inserted 3419309, updated 296101, deleted 1912171, read 103446904208
0.00 inserts/s, 0.05 updates/s, 0.00 deletes/s, 0.55 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 80878
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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