Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-27 15:05:36 0x5f10 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 31 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 8616 srv_active, 0 srv_shutdown, 9564 srv_idle
srv_master_thread log flush and writes: 18180
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 11983
OS WAIT ARRAY INFO: signal count 8317
RW-shared spins 4196, rounds 124694, OS waits 4099
RW-excl spins 285, rounds 3160, OS waits 78
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.72 RW-shared, 11.09 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 23402
Purge done for trx's n:o < 23402 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284272359334248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359330080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359325912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272359321744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
17788 OS file reads, 87876 OS file writes, 54928 OS fsyncs
3.65 reads/s, 16384 avg bytes/read, 14.74 writes/s, 7.55 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 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
9.55 hash searches/s, 31.19 non-hash searches/s
---
LOG
---
Log sequence number 13303860
Log flushed up to   13303860
Pages flushed up to 13303860
Last checkpoint at  13302515
0 pending log flushes, 0 pending chkp writes
27479 log i/o's done, 3.81 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 102664
Buffer pool size   1003
Free buffers       741
Database pages     256
Old database pages 0
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 17745, created 460, written 51058
3.65 reads/s, 0.00 creates/s, 9.71 writes/s
Buffer pool hit rate 969 / 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: 256, unzip_LRU len: 0
I/O sum[606]:cur[4], 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=31284, Main thread ID=33716, state: sleeping
Number of rows inserted 76, updated 10599, deleted 0, read 170788
0.00 inserts/s, 2.29 updates/s, 0.00 deletes/s, 44.29 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 13037
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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