Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-22 10:13:39 0x7fd9b914d700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 40 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 48 srv_active, 0 srv_shutdown, 723 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 78
OS WAIT ARRAY INFO: signal count 80
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 1, rounds 31, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 31.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9965
Purge done for trx's n:o < 9965 undo n:o < 0 state: running but idle
History list length 52
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422049145936488, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422049145935616, 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
1279 OS file reads, 1120 OS file writes, 419 OS fsyncs
0.02 reads/s, 16384 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 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 7 buffer(s)
1428.59 hash searches/s, 943.25 non-hash searches/s
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LOG
---
Log sequence number          50995930
Log buffer assigned up to    50995930
Log buffer completed up to   50995930
Log written up to            50995930
Log flushed up to            50995930
Added dirty pages up to      50995930
Pages flushed up to          50995930
Last checkpoint at           50995930
258 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 679274
Buffer pool size   8192
Free buffers       6883
Database pages     1290
Old database pages 456
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 397, not young 457
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1146, created 274, written 681
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: 1290, unzip_LRU len: 0
I/O sum[1]: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=367, Main thread ID=140573661132544 , state=sleeping
Number of rows inserted 17442, updated 402, deleted 0, read 1914496
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1897.95 reads/s
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END OF INNODB MONITOR OUTPUT
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