Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-29 02:51:18 0x100e0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 59 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 2117456 srv_active, 0 srv_shutdown, 1870243 srv_idle
srv_master_thread log flush and writes: 3987699
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4627543
OS WAIT ARRAY INFO: signal count 4357407
RW-shared spins 3381334, rounds 87719140, OS waits 2909050
RW-excl spins 1997881, rounds 4044945, OS waits 3931
RW-sx spins 418, rounds 8870, OS waits 271
Spin rounds per wait: 25.94 RW-shared, 2.02 RW-excl, 21.22 RW-sx
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TRANSACTIONS
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Trx id counter 12925555
Purge done for trx's n:o < 12925555 undo n:o < 0 state: running
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283442256388456, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283442256384288, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283442256380120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283442256375952, 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
17566806 OS file reads, 46504430 OS file writes, 20877623 OS fsyncs
9.20 reads/s, 16384 avg bytes/read, 24.81 writes/s, 10.03 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, 5668 merges
merged operations:
 insert 7836, delete mark 4, delete 2
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 1 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)
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)
32.07 hash searches/s, 70.41 non-hash searches/s
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LOG
---
Log sequence number 5473447601
Log flushed up to   5473447581
Pages flushed up to 5473446436
Last checkpoint at  5473304666
0 pending log flushes, 0 pending chkp writes
12911815 log i/o's done, 6.53 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 175280
Buffer pool size   1003
Free buffers       761
Database pages     234
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
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 17566746, created 227191, written 30856907
8.53 reads/s, 0.20 creates/s, 12.51 writes/s
Buffer pool hit rate 967 / 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: 234, unzip_LRU len: 0
I/O sum[921]:cur[157], 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=4648, Main thread ID=6396, state: sleeping
Number of rows inserted 7787, updated 5682783, deleted 443, read 9757660562
0.00 inserts/s, 4.86 updates/s, 0.00 deletes/s, 30.46 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 10986
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 18.36 reads/s
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END OF INNODB MONITOR OUTPUT
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