Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2025-11-18 16:35:55 0x7ff32c9e2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 3 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 70 srv_active, 0 srv_shutdown, 237 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 173
OS WAIT ARRAY INFO: signal count 173
RW-shared spins 9, rounds 17, OS waits 8
RW-excl spins 11, rounds 271, OS waits 7
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.89 RW-shared, 24.64 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10209
Purge done for trx's n:o < 10208 undo n:o < 0 state: running but idle
History list length 37
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422158461340264, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422158461339392, 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
1665 OS file reads, 2522 OS file writes, 916 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 8 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 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 32 buffer(s)
889.37 hash searches/s, 447.85 non-hash searches/s
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LOG
---
Log sequence number 51267158
Log buffer assigned up to 51267158
Log buffer completed up to 51267158
Log written up to 51267158
Log flushed up to 51267158
Added dirty pages up to 51267158
Pages flushed up to 51267158
Last checkpoint at 51267158
733 log i/o's done, 0.00 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 921009
Buffer pool size 8192
Free buffers 6432
Database pages 1682
Old database pages 626
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 551, not young 190577
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1482, created 593, written 1398
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[289]: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=140682975966976 , state=sleeping
Number of rows inserted 117188, updated 639, deleted 55, read 970717
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1711.76 reads/s
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END OF INNODB MONITOR OUTPUT
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