Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
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2026-09-26 14:03:19 0x59d4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 27 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 637 srv_active, 0 srv_shutdown, 20038 srv_idle
srv_master_thread log flush and writes: 20675
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 25429
OS WAIT ARRAY INFO: signal count 7318
RW-shared spins 316, rounds 7596, OS waits 135
RW-excl spins 33, rounds 256, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 24.04 RW-shared, 7.76 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 220045
Purge done for trx's n:o < 220044 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284243720819048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284243720810712, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284243720823216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284243720814880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 220044, ACTIVE 0 sec updating or deleting
mysql tables in use 1, locked 1
2 lock struct(s), heap size 1128, 1 row lock(s), undo log entries 1
MySQL thread id 6876, OS thread handle 20828, query id 334587 localhost 127.0.0.1 pma Update
REPLACE INTO `phpmyadmin`.`pma__recent` (`username`, `tables`) VALUES ('root', '[{\"db\":\"phpmyadmin\",\"table\":\"pma__table_coords\"},{\"db\":\"mysql\",\"table\":\"plugin\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__central_columns\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__export_templates\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__table_info\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__navigationhiding\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__userconfig\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__table_uiprefs\"},{\"db\":\"mysql\",\"table\":\"table_stats\"},{\"db\":\"phpmyadmin\",\"table\":\
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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
4393 OS file reads, 9205 OS file writes, 4804 OS fsyncs
0.81 reads/s, 16384 avg bytes/read, 3.67 writes/s, 1.85 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 3, seg size 5, 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 0 buffer(s)
Hash table size 4441, node heap has 0 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
4.00 hash searches/s, 7.56 non-hash searches/s
---
LOG
---
Log sequence number 407712406
Log flushed up to 407712406
Pages flushed up to 407710134
Last checkpoint at 407706001
0 pending log flushes, 0 pending chkp writes
2758 log i/o's done, 1.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
Buffer pool size 1003
Free buffers 740
Database pages 258
Old database pages 0
Modified db pages 5
Percent of dirty pages(LRU & free pages): 0.501
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 78, not young 497
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4295, created 207, written 5666
0.81 reads/s, 0.00 creates/s, 2.30 writes/s
Buffer pool hit rate 971 / 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: 258, unzip_LRU len: 0
I/O sum[142]:cur[33], 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=5208, Main thread ID=11620, state: sleeping
Number of rows inserted 9, updated 1485, deleted 0, read 38964
0.00 inserts/s, 0.67 updates/s, 0.00 deletes/s, 3.78 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 12218
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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