Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2025-11-18 15:21:04 0x7eff94b9a700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 50 srv_active, 0 srv_shutdown, 264 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 142
OS WAIT ARRAY INFO: signal count 143
RW-shared spins 3, rounds 5, OS waits 2
RW-excl spins 4, rounds 120, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.67 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10110
Purge done for trx's n:o < 10110 undo n:o < 0 state: running but idle
History list length 39
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421112009718376, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421112009717504, 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
1519 OS file reads, 1925 OS file writes, 652 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 9 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 25 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 31 buffer(s)
148.43 hash searches/s, 15.22 non-hash searches/s
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LOG
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Log sequence number 51128874
Log buffer assigned up to 51128874
Log buffer completed up to 51128874
Log written up to 51128874
Log flushed up to 51128874
Added dirty pages up to 51128874
Pages flushed up to 51128874
Last checkpoint at 51128874
498 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 764064
Buffer pool size 8192
Free buffers 6581
Database pages 1538
Old database pages 577
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 706, not young 175881
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1364, created 362, written 1174
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: 1538, unzip_LRU len: 0
I/O sum[155]: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=369, Main thread ID=139636596963072 , state=sleeping
Number of rows inserted 65939, updated 554, deleted 0, read 703318
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 352.29 reads/s
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END OF INNODB MONITOR OUTPUT
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