Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2026-03-17 01:38:43 0x7f42acc21700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 49 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 28 srv_active, 0 srv_shutdown, 447 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 55
OS WAIT ARRAY INFO: signal count 58
RW-shared spins 2, rounds 2, OS waits 0
RW-excl spins 3, rounds 60, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 20.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9883
Purge done for trx's n:o < 9883 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421399980579432, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421399980578560, 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
1419 OS file reads, 900 OS file writes, 287 OS fsyncs
0.22 reads/s, 16384 avg bytes/read, 0.76 writes/s, 0.47 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 1 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 31 buffer(s)
2723.05 hash searches/s, 2049.20 non-hash searches/s
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LOG
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Log sequence number 50994648
Log buffer assigned up to 50994648
Log buffer completed up to 50994648
Log written up to 50994648
Log flushed up to 50994648
Added dirty pages up to 50994648
Pages flushed up to 50994648
Last checkpoint at 50994648
177 log i/o's done, 0.33 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 697664
Buffer pool size 8192
Free buffers 6692
Database pages 1425
Old database pages 506
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 302, not young 691424
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1280, created 245, written 585
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: 1425, unzip_LRU len: 0
I/O sum[28]: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=139924496107264 , state=sleeping
Number of rows inserted 16692, updated 367, deleted 0, read 2340729
0.08 inserts/s, 0.08 updates/s, 0.00 deletes/s, 3370.36 reads/s
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END OF INNODB MONITOR OUTPUT
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