Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-01 04:05:31 0x2adc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 25 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 19899 srv_active, 0 srv_shutdown, 1865076 srv_idle
srv_master_thread log flush and writes: 1884975
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 84097
OS WAIT ARRAY INFO: signal count 21927
RW-shared spins 16992, rounds 397760, OS waits 12483
RW-excl spins 9258, rounds 103385, OS waits 1488
RW-sx spins 859, rounds 16476, OS waits 207
Spin rounds per wait: 23.41 RW-shared, 11.17 RW-excl, 19.18 RW-sx
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TRANSACTIONS
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Trx id counter 148907
Purge done for trx's n:o < 148907 undo n:o < 0 state: running but idle
History list length 29
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283519618490656, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283519618482320, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283519618486488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283519618511496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283519618503160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
41577 OS file reads, 94805 OS file writes, 59941 OS fsyncs
4.76 reads/s, 16384 avg bytes/read, 11.60 writes/s, 6.92 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 9, seg size 11, 708 merges
merged operations:
 insert 692, delete mark 612, delete 2
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 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)
17.28 hash searches/s, 43.04 non-hash searches/s
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LOG
---
Log sequence number 71337683
Log flushed up to   71337663
Pages flushed up to 71279893
Last checkpoint at  71277171
0 pending log flushes, 0 pending chkp writes
36793 log i/o's done, 4.16 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 157752
Buffer pool size   1003
Free buffers       736
Database pages     261
Old database pages 0
Modified db pages  106
Percent of dirty pages(LRU & free pages): 10.621
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 41511, created 493, written 50746
4.76 reads/s, 0.32 creates/s, 6.20 writes/s
Buffer pool hit rate 966 / 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: 261, unzip_LRU len: 0
I/O sum[533]:cur[6], 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=4048, Main thread ID=4796, state: sleeping
Number of rows inserted 2835, updated 2715, deleted 5894, read 16367758
0.00 inserts/s, 3.36 updates/s, 0.00 deletes/s, 17.88 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3044
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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