Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2026-01-01 20:05:12 0x7fd4c010d700 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: 6 srv_active, 0 srv_shutdown, 259 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 17
OS WAIT ARRAY INFO: signal count 17
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9793
Purge done for trx's n:o < 9793 undo n:o < 0 state: running but idle
History list length 68
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422026743073384, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422026743072512, 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
1359 OS file reads, 312 OS file writes, 89 OS fsyncs
0.18 reads/s, 16384 avg bytes/read, 0.77 writes/s, 0.50 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 1 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 4 buffer(s)
213.04 hash searches/s, 88.77 non-hash searches/s
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LOG
---
Log sequence number 50956073
Log buffer assigned up to 50956073
Log buffer completed up to 50956073
Log written up to 50956073
Log flushed up to 50956073
Added dirty pages up to 50956073
Pages flushed up to 50956073
Last checkpoint at 50956073
64 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 547593
Buffer pool size 8192
Free buffers 6799
Database pages 1382
Old database pages 495
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 37, not young 6
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1240, created 145, written 206
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: 1382, unzip_LRU len: 0
I/O sum[12]: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=140551258052352 , state=sleeping
Number of rows inserted 92, updated 335, deleted 0, read 151954
0.00 inserts/s, 0.14 updates/s, 0.00 deletes/s, 475.75 reads/s
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END OF INNODB MONITOR OUTPUT
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