Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-08 08:24:10 0x7fa4f00f2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 14 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 26 srv_active, 0 srv_shutdown, 476 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 68
OS WAIT ARRAY INFO: signal count 68
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 4, rounds 121, OS waits 5
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 30.25 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9917
Purge done for trx's n:o < 9911 undo n:o < 0 state: running but idle
History list length 10
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421821497118160, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421821497117288, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421821497116416, 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
1366 OS file reads, 813 OS file writes, 292 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 1 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 1 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
2179.06 hash searches/s, 1634.88 non-hash searches/s
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LOG
---
Log sequence number          50991357
Log buffer assigned up to    50991357
Log buffer completed up to   50991357
Log written up to            50991357
Log flushed up to            50991357
Added dirty pages up to      50991357
Pages flushed up to          50991357
Last checkpoint at           50991357
201 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 635725
Buffer pool size   8192
Free buffers       6791
Database pages     1385
Old database pages 491
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 312, not young 728
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1239, created 155, written 526
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: 1385, unzip_LRU len: 0
I/O sum[36]: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=372, Main thread ID=140346011080448 , state=sleeping
Number of rows inserted 115, updated 382, deleted 0, read 1336031
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2731.66 reads/s
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END OF INNODB MONITOR OUTPUT
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