Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-03 19:51:36 0x7f9d98dc3700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 46 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 13261 srv_active, 0 srv_shutdown, 4898 srv_idle
srv_master_thread log flush and writes: 18159
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 34421
OS WAIT ARRAY INFO: signal count 27320
RW-shared spins 0, rounds 10889, OS waits 5415
RW-excl spins 0, rounds 4743, OS waits 156
RW-sx spins 4, rounds 111, OS waits 3
Spin rounds per wait: 10889.00 RW-shared, 4743.00 RW-excl, 27.75 RW-sx
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TRANSACTIONS
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Trx id counter 87993
Purge done for trx's n:o < 87993 undo n:o < 0 state: running but idle
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421789849182712, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421789849178456, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421789849174200, 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
863 OS file reads, 168798 OS file writes, 85736 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 10.20 writes/s, 5.07 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 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 9 buffer(s)
Hash table size 69257, node heap has 2 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
5.63 hash searches/s, 0.07 non-hash searches/s
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LOG
---
Log sequence number 43439295
Log flushed up to   43439295
Pages flushed up to 43439295
Last checkpoint at  43439252
0 pending log flushes, 0 pending chkp writes
49664 log i/o's done, 2.78 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15109
Database pages     850
Old database pages 333
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 704, created 146, written 105623
0.00 reads/s, 0.00 creates/s, 6.54 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: 850, unzip_LRU len: 0
I/O sum[0]: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=907, Main thread ID=140314165638912, state: sleeping
Number of rows inserted 1, updated 24897, deleted 0, read 1004569
0.00 inserts/s, 1.37 updates/s, 0.00 deletes/s, 2.91 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1560
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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