Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-20 06:57:09 0x7f00d4085700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 11 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 87 srv_active, 0 srv_shutdown, 594 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 215
OS WAIT ARRAY INFO: signal count 233
RW-shared spins 23, rounds 28, OS waits 7
RW-excl spins 13, rounds 342, OS waits 20
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.22 RW-shared, 26.31 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 10281
Purge done for trx's n:o < 10280 undo n:o < 0 state: running but idle
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421117085207144, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421117085206272, 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
1377 OS file reads, 3938 OS file writes, 1117 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 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 0 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 8 buffer(s)
3678.03 hash searches/s, 3004.18 non-hash searches/s
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LOG
---
Log sequence number          51290241
Log buffer assigned up to    51290241
Log buffer completed up to   51290241
Log written up to            51290241
Log flushed up to            51290241
Added dirty pages up to      51290241
Pages flushed up to          51290241
Last checkpoint at           51290241
872 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 728516
Buffer pool size   8192
Free buffers       6725
Database pages     1449
Old database pages 530
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 748, not young 929
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1252, created 2152, written 1883
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: 1449, unzip_LRU len: 0
I/O sum[78]: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=365, Main thread ID=139641597400832 , state=sleeping
Number of rows inserted 361787, updated 731, deleted 0, read 8422161
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 4565.68 reads/s
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END OF INNODB MONITOR OUTPUT
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