Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2026-02-14 22:06:10 0x7f69e81f2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 17 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 11 srv_active, 0 srv_shutdown, 310 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 26
OS WAIT ARRAY INFO: signal count 26
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 1, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9814
Purge done for trx's n:o < 9812 undo n:o < 0 state: running but idle
History list length 79
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421568000548304, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421568000547432, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421568000546560, 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
1252 OS file reads, 515 OS file writes, 133 OS fsyncs
0.29 reads/s, 13312 avg bytes/read, 7.94 writes/s, 0.29 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 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
571.44 hash searches/s, 200.52 non-hash searches/s
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LOG
---
Log sequence number 50962027
Log buffer assigned up to 50962027
Log buffer completed up to 50962027
Log written up to 50962027
Log flushed up to 50962027
Added dirty pages up to 50962027
Pages flushed up to 50962027
Last checkpoint at 50962027
89 log i/o's done, 0.06 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 549811
Buffer pool size 8192
Free buffers 6892
Database pages 1286
Old database pages 461
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 33, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1143, created 231, written 333
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 1 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1286, unzip_LRU len: 0
I/O sum[89]: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=366, Main thread ID=140092515755776 , state=sleeping
Number of rows inserted 16387, updated 346, deleted 0, read 113277
963.71 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1716.55 reads/s
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END OF INNODB MONITOR OUTPUT
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