Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2025-09-14 08:37:15 0x7fc7a009a700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 10 srv_active, 0 srv_shutdown, 376 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 12
OS WAIT ARRAY INFO: signal count 11
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 9771
Purge done for trx's n:o < 9771 undo n:o < 0 state: running but idle
History list length 61
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421970900408936, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421970900409808, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421970900408064, 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
1168 OS file reads, 316 OS file writes, 109 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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 0 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)
141.79 hash searches/s, 62.40 non-hash searches/s
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LOG
---
Log sequence number 50954429
Log buffer assigned up to 50954429
Log buffer completed up to 50954429
Log written up to 50954429
Log flushed up to 50954429
Added dirty pages up to 50954429
Pages flushed up to 50954429
Last checkpoint at 50954429
57 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 447297
Buffer pool size 8192
Free buffers 6972
Database pages 1211
Old database pages 427
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 57, not young 250
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1069, 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: 1211, unzip_LRU len: 0
I/O sum[0]: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=386, Main thread ID=140495415084800 , state=sleeping
Number of rows inserted 93, updated 328, deleted 0, read 59943
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 246.69 reads/s
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END OF INNODB MONITOR OUTPUT
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