Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-16 05:11:50 0x7f46900e9700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 53 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 70 srv_active, 0 srv_shutdown, 591 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 140
OS WAIT ARRAY INFO: signal count 162
RW-shared spins 15, rounds 18, OS waits 5
RW-excl spins 7, rounds 158, OS waits 11
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.20 RW-shared, 22.57 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10287
Purge done for trx's n:o < 10285 undo n:o < 0 state: running but idle
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421416156445288, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421416156444416, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
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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
1652 OS file reads, 3421 OS file writes, 994 OS fsyncs
0.28 reads/s, 15360 avg bytes/read, 0.66 writes/s, 0.42 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 8 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 32 buffer(s)
13492.16 hash searches/s, 11066.89 non-hash searches/s
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LOG
---
Log sequence number          51193765
Log buffer assigned up to    51193765
Log buffer completed up to   51193765
Log written up to            51193765
Log flushed up to            51193765
Added dirty pages up to      51193765
Pages flushed up to          51193765
Last checkpoint at           51193765
788 log i/o's done, 0.25 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 137363456
Dictionary memory allocated 911778
Buffer pool size   8192
Free buffers       6436
Database pages     1681
Old database pages 600
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 384, not young 212
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1493, created 1772, written 1659
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: 1681, unzip_LRU len: 0
I/O sum[29]: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=370, Main thread ID=139940672231168 , state=sleeping
Number of rows inserted 295100, updated 599, deleted 0, read 12503369
0.02 inserts/s, 0.08 updates/s, 0.00 deletes/s, 15335.28 reads/s
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END OF INNODB MONITOR OUTPUT
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