Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-19 11:01:42 0x3e08 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 18 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 433914 srv_active, 0 srv_shutdown, 5972371 srv_idle
srv_master_thread log flush and writes: 6406285
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 19871105
OS WAIT ARRAY INFO: signal count 3970552
RW-shared spins 1398492, rounds 23083985, OS waits 652971
RW-excl spins 1246427, rounds 6335755, OS waits 34656
RW-sx spins 27734, rounds 569180, OS waits 11046
Spin rounds per wait: 16.51 RW-shared, 5.08 RW-excl, 20.52 RW-sx
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TRANSACTIONS
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Trx id counter 5856992
Purge done for trx's n:o < 5856992 undo n:o < 0 state: running but idle
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283371855417560, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855438400, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855421728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855430064, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855425896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283371855413392, 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
63397606 OS file reads, 12255865 OS file writes, 5079407 OS fsyncs
11.50 reads/s, 16384 avg bytes/read, 7.50 writes/s, 4.39 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 35, seg size 37, 79182 merges
merged operations:
 insert 114128, delete mark 41566, delete 7866
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 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)
Hash table size 4441, node heap has 1 buffer(s)
27.28 hash searches/s, 37.16 non-hash searches/s
---
LOG
---
Log sequence number 33297063365
Log flushed up to   33297063345
Pages flushed up to 33297022381
Last checkpoint at  33297019699
0 pending log flushes, 0 pending chkp writes
2658534 log i/o's done, 2.94 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1567504
Buffer pool size   1003
Free buffers       732
Database pages     263
Old database pages 0
Modified db pages  60
Percent of dirty pages(LRU & free pages): 6.024
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 3289858, not young 258844709
0.00 youngs/s, 0.00 non-youngs/s
Pages read 63397201, created 888166, written 8748066
11.50 reads/s, 0.17 creates/s, 3.89 writes/s
Buffer pool hit rate 947 / 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: 263, unzip_LRU len: 0
I/O sum[1173]:cur[8], 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=17232, Main thread ID=9312, state: sleeping
Number of rows inserted 3476837, updated 1358602, deleted 233603, read 3376631372
0.00 inserts/s, 2.22 updates/s, 0.00 deletes/s, 450.59 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4074760
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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