Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-06 00:19:51 0x7f7fe0103700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 60 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 24 srv_active, 0 srv_shutdown, 219 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 468
OS WAIT ARRAY INFO: signal count 441
RW-shared spins 61, rounds 114, OS waits 53
RW-excl spins 228, rounds 1687, OS waits 25
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 1.87 RW-shared, 7.40 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 10444
Purge done for trx's n:o < 10443 undo n:o < 0 state: running but idle
History list length 57
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421662228961896, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421662228961024, 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
1465 OS file reads, 3780 OS file writes, 1014 OS fsyncs
0.02 reads/s, 16384 avg bytes/read, 0.80 writes/s, 0.03 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 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
2115.90 hash searches/s, 1399.51 non-hash searches/s
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LOG
---
Log sequence number          52776744
Log buffer assigned up to    52776744
Log buffer completed up to   52776744
Log written up to            52776744
Log flushed up to            52776744
Added dirty pages up to      52776744
Pages flushed up to          52776744
Last checkpoint at           52776744
1924 log i/o's done, 0.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 564214
Buffer pool size   8192
Free buffers       6599
Database pages     1566
Old database pages 559
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 100, not young 2
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1320, created 429, written 1638
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: 1566, unzip_LRU len: 0
I/O sum[2]: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=140186739488512 , state=sleeping
Number of rows inserted 34613, updated 3195, deleted 1808, read 633723
294.60 inserts/s, 0.00 updates/s, 0.00 deletes/s, 3251.20 reads/s
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END OF INNODB MONITOR OUTPUT
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