Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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2025-12-23 07:49:45 0x7f3ad409a700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 55 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 35 srv_active, 0 srv_shutdown, 202 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 89
OS WAIT ARRAY INFO: signal count 89
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 2, rounds 60, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10022
Purge done for trx's n:o < 10022 undo n:o < 0 state: running but idle
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421366181001832, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421366181000960, 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
1502 OS file reads, 1217 OS file writes, 434 OS fsyncs
0.51 reads/s, 14738 avg bytes/read, 5.29 writes/s, 1.47 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 0 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 3 buffer(s)
Hash table size 34679, node heap has 31 buffer(s)
627.66 hash searches/s, 242.36 non-hash searches/s
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LOG
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Log sequence number 51015311
Log buffer assigned up to 51015311
Log buffer completed up to 51015311
Log written up to 51015311
Log flushed up to 51015311
Added dirty pages up to 51015311
Pages flushed up to 51015311
Last checkpoint at 51015311
343 log i/o's done, 0.78 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 642813
Buffer pool size 8192
Free buffers 6605
Database pages 1514
Old database pages 554
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 478, not young 190935
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1367, created 335, written 684
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: 1514, unzip_LRU len: 0
I/O sum[154]: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=139890697111296 , state=sleeping
Number of rows inserted 65703, updated 415, deleted 0, read 341231
1191.56 inserts/s, 0.33 updates/s, 0.00 deletes/s, 1721.70 reads/s
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END OF INNODB MONITOR OUTPUT
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