Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-24 12:07:44 0x7f69c68e6700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 52 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 62 srv_active, 0 srv_shutdown, 355 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 143
OS WAIT ARRAY INFO: signal count 140
RW-shared spins 1, rounds 1, 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: 1.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10203
Purge done for trx's n:o < 10202 undo n:o < 0 state: running but idle
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421568740421072, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421568740420200, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421568740419328, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
--------
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
1638 OS file reads, 1830 OS file writes, 635 OS fsyncs
0.40 reads/s, 12726 avg bytes/read, 1.00 writes/s, 0.65 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 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
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 3 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
358.44 hash searches/s, 87.36 non-hash searches/s
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LOG
---
Log sequence number          51046589
Log buffer assigned up to    51046589
Log buffer completed up to   51046589
Log written up to            51046589
Log flushed up to            51046589
Added dirty pages up to      51046589
Pages flushed up to          51046589
Last checkpoint at           51046589
510 log i/o's done, 0.33 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 831191
Buffer pool size   8192
Free buffers       6571
Database pages     1601
Old database pages 578
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 512, not young 3014
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1453, created 709, written 913
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: 1601, unzip_LRU len: 0
I/O sum[32]: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=140093256840960 , state=sleeping
Number of rows inserted 182339, updated 479, deleted 0, read 585865
1.87 inserts/s, 0.10 updates/s, 0.00 deletes/s, 736.35 reads/s
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END OF INNODB MONITOR OUTPUT
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