Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-29 07:00:55 0x64e8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 49 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 416 srv_active, 0 srv_shutdown, 2439029 srv_idle
srv_master_thread log flush and writes: 2439445
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 17087
OS WAIT ARRAY INFO: signal count 1666
RW-shared spins 703, rounds 21126, OS waits 582
RW-excl spins 155, rounds 3890, OS waits 76
RW-sx spins 2, rounds 26, OS waits 0
Spin rounds per wait: 30.05 RW-shared, 25.10 RW-excl, 13.00 RW-sx
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TRANSACTIONS
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Trx id counter 410001
Purge done for trx's n:o < 410001 undo n:o < 0 state: running
History list length 27
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284574732628472, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732611800, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732624304, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732620136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732615968, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284574732607632, 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
2743 OS file reads, 7878 OS file writes, 3782 OS fsyncs
1.59 reads/s, 16384 avg bytes/read, 6.27 writes/s, 2.84 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 299, seg size 301, 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)
6.90 hash searches/s, 16.96 non-hash searches/s
---
LOG
---
Log sequence number 168039417
Log flushed up to   168039417
Pages flushed up to 168038218
Last checkpoint at  168021213
0 pending log flushes, 0 pending chkp writes
2391 log i/o's done, 1.94 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 205328
Buffer pool size   1003
Free buffers       744
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.299
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 2678, created 313, written 4955
1.59 reads/s, 0.04 creates/s, 3.90 writes/s
Buffer pool hit rate 970 / 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: 257, unzip_LRU len: 0
I/O sum[280]:cur[11], 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=24860, Main thread ID=5724, state: sleeping
Number of rows inserted 109, updated 1098, deleted 0, read 26008
0.00 inserts/s, 1.41 updates/s, 0.00 deletes/s, 6.88 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2277
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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