Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-03 17:19:04 0x3bd0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 45 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 120946 srv_active, 0 srv_shutdown, 851985 srv_idle
srv_master_thread log flush and writes: 972929
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4244485
OS WAIT ARRAY INFO: signal count 491736
RW-shared spins 171012, rounds 5127896, OS waits 167311
RW-excl spins 905, rounds 27573, OS waits 848
RW-sx spins 77, rounds 2319, OS waits 51
Spin rounds per wait: 29.99 RW-shared, 30.47 RW-excl, 30.12 RW-sx
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TRANSACTIONS
------------
Trx id counter 726137
Purge done for trx's n:o < 726137 undo n:o < 0 state: running
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282939159671176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159658648, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159692056, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159687880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159683704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159679528, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159675352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159667000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282939159662824, 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
179305 OS file reads, 1532730 OS file writes, 1080913 OS fsyncs
0.60 reads/s, 16384 avg bytes/read, 7.51 writes/s, 4.56 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
11.98 hash searches/s, 26.04 non-hash searches/s
---
LOG
---
Log sequence number 465139822
Log flushed up to   465139822
Pages flushed up to 465139822
Last checkpoint at  465132409
0 pending log flushes, 0 pending chkp writes
644716 log i/o's done, 2.51 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       744
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 179269, created 7566, written 729590
0.60 reads/s, 0.02 creates/s, 4.22 writes/s
Buffer pool hit rate 993 / 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[244]:cur[8], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=1304, Main thread ID=3572, state: sleeping
Number of rows inserted 0, updated 153070, deleted 0, read 8143751
0.00 inserts/s, 0.96 updates/s, 0.00 deletes/s, 11.64 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 6097
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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