Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-30 16:25:35 0x307331000 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 54 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 4021 srv_active, 0 srv_shutdown, 22382 srv_idle
srv_master_thread log flush and writes: 26403
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 40050
OS WAIT ARRAY INFO: signal count 19368
RW-shared spins 1998, rounds 59695, OS waits 1926
RW-excl spins 168, rounds 3980, OS waits 56
RW-sx spins 19, rounds 570, OS waits 16
Spin rounds per wait: 29.88 RW-shared, 23.69 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 265452
Purge done for trx's n:o < 265452 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422033430159576, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 422033430155376, 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: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
24583 OS file reads, 49445 OS file writes, 28082 OS fsyncs
4.39 reads/s, 16384 avg bytes/read, 8.78 writes/s, 4.41 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 11, seg size 13, 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 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 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
24.54 hash searches/s, 36.46 non-hash searches/s
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LOG
---
Log sequence number 84041140
Log flushed up to   84040337
Pages flushed up to 84019962
Last checkpoint at  83930004
0 pending log flushes, 0 pending chkp writes
16230 log i/o's done, 3.13 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 335104
Buffer pool size   1002
Free buffers       723
Database pages     270
Old database pages 0
Modified db pages  52
Percent of dirty pages(LRU & free pages): 5.231
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 24444, created 569, written 28395
4.39 reads/s, 0.15 creates/s, 5.02 writes/s
Buffer pool hit rate 974 / 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: 270, unzip_LRU len: 0
I/O sum[508]: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=2040, Main thread ID=12999188480, state: sleeping
Number of rows inserted 300, updated 8070, deleted 104, read 2732486
0.00 inserts/s, 2.43 updates/s, 0.00 deletes/s, 38.96 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 19081
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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