Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-16 16:27:21 0x7fb8580c1700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 22 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 55 srv_active, 0 srv_shutdown, 638 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 195
OS WAIT ARRAY INFO: signal count 196
RW-shared spins 24, rounds 40, OS waits 16
RW-excl spins 13, rounds 309, OS waits 14
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 23.77 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10455
Purge done for trx's n:o < 10453 undo n:o < 0 state: running but idle
History list length 32
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421904711551592, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421904711552464, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421904711550720, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1557 OS file reads, 3204 OS file writes, 1195 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 9 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 31 buffer(s)
2465.43 hash searches/s, 1733.88 non-hash searches/s
---
LOG
---
Log sequence number          51820838
Log buffer assigned up to    51820838
Log buffer completed up to   51820838
Log written up to            51820838
Log flushed up to            51820838
Added dirty pages up to      51820838
Pages flushed up to          51820838
Last checkpoint at           51820838
1298 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 958985
Buffer pool size   8192
Free buffers       6435
Database pages     1682
Old database pages 637
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1017, not young 112685
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1400, created 373, written 1638
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 1682, unzip_LRU len: 0
I/O sum[11]: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=373, Main thread ID=140429226071808 , state=sleeping
Number of rows inserted 33547, updated 1103, deleted 214, read 4114374
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 3521.34 reads/s
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END OF INNODB MONITOR OUTPUT
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