Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-14 22:44:54 0x36a0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 9198 srv_active, 0 srv_shutdown, 11284 srv_idle
srv_master_thread log flush and writes: 20482
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 20945
OS WAIT ARRAY INFO: signal count 12382
RW-shared spins 10788, rounds 199115, OS waits 4768
RW-excl spins 8842, rounds 18056, OS waits 154
RW-sx spins 210, rounds 1681, OS waits 29
Spin rounds per wait: 18.46 RW-shared, 2.04 RW-excl, 8.00 RW-sx
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TRANSACTIONS
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Trx id counter 44975
Purge done for trx's n:o < 44975 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283359865463432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865459264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865455096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865450928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865446760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865442592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865438424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283359865434256, 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
94989 OS file reads, 126719 OS file writes, 64464 OS fsyncs
1.46 reads/s, 16384 avg bytes/read, 2.15 writes/s, 1.42 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 148 merges
merged operations:
 insert 905, 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 1 buffer(s)
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 1 buffer(s)
2.73 hash searches/s, 11.38 non-hash searches/s
---
LOG
---
Log sequence number 170160031
Log flushed up to   170160031
Pages flushed up to 170160031
Last checkpoint at  170159988
0 pending log flushes, 0 pending chkp writes
33158 log i/o's done, 0.88 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 212840
Buffer pool size   1003
Free buffers       740
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 1556, not young 403768
0.00 youngs/s, 0.00 non-youngs/s
Pages read 94774, created 7628, written 82312
1.46 reads/s, 0.00 creates/s, 1.08 writes/s
Buffer pool hit rate 964 / 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[134]:cur[0], 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=3720, Main thread ID=13284, state: sleeping
Number of rows inserted 126818, updated 13924, deleted 0, read 2969156
0.19 inserts/s, 0.15 updates/s, 0.00 deletes/s, 7.04 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 33720
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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