Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-30 01:09:17 0x58a0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 18 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 14300 srv_active, 0 srv_shutdown, 884261 srv_idle
srv_master_thread log flush and writes: 898561
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 66716
OS WAIT ARRAY INFO: signal count 128710
RW-shared spins 908633, rounds 9382842, OS waits 52810
RW-excl spins 162681, rounds 489900, OS waits 3735
RW-sx spins 166, rounds 2103, OS waits 49
Spin rounds per wait: 10.33 RW-shared, 3.01 RW-excl, 12.67 RW-sx
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TRANSACTIONS
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Trx id counter 179441
Purge done for trx's n:o < 179441 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283521888211160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888219496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888215328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283521888206992, 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
3283609 OS file reads, 169825 OS file writes, 101008 OS fsyncs
1.94 reads/s, 16384 avg bytes/read, 8.44 writes/s, 4.22 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, 86 merges
merged operations:
 insert 2364, 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 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)
9.83 hash searches/s, 23.67 non-hash searches/s
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LOG
---
Log sequence number 3593824332
Log flushed up to   3593824312
Pages flushed up to 3593817643
Last checkpoint at  3593807988
0 pending log flushes, 0 pending chkp writes
52950 log i/o's done, 2.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 162760
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  23
Percent of dirty pages(LRU & free pages): 2.309
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 389847, not young 161945716
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3283559, created 8334, written 100084
1.94 reads/s, 0.06 creates/s, 5.33 writes/s
Buffer pool hit rate 978 / 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[1076]: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=5200, Main thread ID=856, state: sleeping
Number of rows inserted 1021487, updated 14497, deleted 1710, read 418003661
0.00 inserts/s, 1.56 updates/s, 0.00 deletes/s, 11.83 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 0
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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