Speicher-Engines

InnoDB

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

[ Variablen | Puffer-Pool | InnoDB-Status ]

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2026-01-22 16:41:39 0x7fe0f4a0f700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 28 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 12308 srv_active, 0 srv_shutdown, 16878 srv_idle
srv_master_thread log flush and writes: 29185
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 37228
OS WAIT ARRAY INFO: signal count 33414
RW-shared spins 0, rounds 19653, OS waits 9751
RW-excl spins 0, rounds 3366, OS waits 117
RW-sx spins 1, rounds 1, OS waits 0
Spin rounds per wait: 19653.00 RW-shared, 3366.00 RW-excl, 1.00 RW-sx
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2026-01-22 14:22:32 0x7fe0f48e3700 Error in foreign key constraint of table `assessment`.`assessment_answers`:
Create  table `assessment`.`assessment_answers` with foreign key constraint failed. Referenced table `assessment`.`question_options` not found in the data dictionary near ' FOREIGN KEY (`answer_option_id`) REFERENCES `question_options` (`id`) ON DELETE SET NULL ON UPDATE CASCADE,
  CONSTRAINT `fk_answers_question` FOREIGN KEY (`question_id`) REFERENCES `questions` (`id`) ON DELETE RESTRICT ON UPDATE CASCADE,
  CONSTRAINT `fk_answers_submission` FOREIGN KEY (`submission_id`) REFERENCES `assessment_submissions` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4'.
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TRANSACTIONS
------------
Trx id counter 92346
Purge done for trx's n:o < 92346 undo n:o < 0 state: running but idle
History list length 24
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422079135039992, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422079135035736, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422079135031480, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
889 OS file reads, 181566 OS file writes, 91648 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 1.46 writes/s, 1.14 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 2 merges
merged operations:
 insert 2, delete mark 1, delete 1
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 11 buffer(s)
Hash table size 69257, node heap has 2 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
0.86 hash searches/s, 0.18 non-hash searches/s
---
LOG
---
Log sequence number 44941500
Log flushed up to   44941500
Pages flushed up to 44941500
Last checkpoint at  44941491
0 pending log flushes, 0 pending chkp writes
58305 log i/o's done, 0.82 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 157648
Buffer pool size   16024
Free buffers       15027
Database pages     929
Old database pages 354
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 730, created 199, written 111073
0.00 reads/s, 0.00 creates/s, 0.54 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: 929, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=910, Main thread ID=140603388057344, state: sleeping
Number of rows inserted 63, updated 26167, deleted 1, read 4738722
0.00 inserts/s, 0.21 updates/s, 0.00 deletes/s, 0.43 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8552
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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