Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-06 06:15:18 0x1270 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 8 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 403 srv_active, 0 srv_shutdown, 29050 srv_idle
srv_master_thread log flush and writes: 29453
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 16305
OS WAIT ARRAY INFO: signal count 961
RW-shared spins 556, rounds 16759, OS waits 483
RW-excl spins 58, rounds 2095, OS waits 51
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.14 RW-shared, 36.12 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 5020
Purge done for trx's n:o < 5017 undo n:o < 0 state: running but idle
History list length 20
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283783515218424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283783515214256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283783515201752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283783515197584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283783515205920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283783515210088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 5019, ACTIVE 0 sec updating or deleting
mysql tables in use 1, locked 1
2 lock struct(s), heap size 1128, 1 row lock(s)
MySQL thread id 2690, OS thread handle 13332, query id 145597 localhost 127.0.0.1 pma Update
REPLACE INTO `phpmyadmin`.`pma__recent` (`username`, `tables`) VALUES ('root', '[{\"db\":\"performance_schema\",\"table\":\"accounts\"},{\"db\":\"performance_schema\",\"table\":\"socket_summary_by_event_name\"},{\"db\":\"performance_schema\",\"table\":\"setup_timers\"},{\"db\":\"information_schema\",\"table\":\"PROCESSLIST\"},{\"db\":\"performance_schema\",\"table\":\"setup_consumers\"},{\"db\":\"performance_schema\",\"table\":\"setup_actors\"},{\"db\":\"mysql\",\"table\":\"help_topic\"},{\"db\":\"performance_schema\",\"table\":\"hosts\"},{\"db\":\"performance_schema\",\"table\":\"threads\"},{
---TRANSACTION 283783515247600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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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
2002 OS file reads, 6367 OS file writes, 3003 OS fsyncs
1 pending reads, 0 pending writes
1.62 reads/s, 16384 avg bytes/read, 12.00 writes/s, 5.37 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 0 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 0 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)
19.75 hash searches/s, 50.24 non-hash searches/s
---
LOG
---
Log sequence number 3398955
Log flushed up to   3398955
Pages flushed up to 3396522
Last checkpoint at  3375597
0 pending log flushes, 0 pending chkp writes
1933 log i/o's done, 3.22 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       745
Database pages     256
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.499
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 1966, created 174, written 4020
1.44 reads/s, 0.11 creates/s, 7.00 writes/s
Buffer pool hit rate 987 / 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[91]: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=9024, Main thread ID=14440, state: sleeping
Number of rows inserted 0, updated 1030, deleted 0, read 6039
0.00 inserts/s, 2.62 updates/s, 0.00 deletes/s, 19.62 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 395
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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