Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-16 00:00:42 0x1b24 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 26 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 9079 srv_active, 0 srv_shutdown, 6949382 srv_idle
srv_master_thread log flush and writes: 6958461
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9320
OS WAIT ARRAY INFO: signal count 6430
RW-shared spins 4483, rounds 117971, OS waits 3809
RW-excl spins 1453, rounds 8212, OS waits 84
RW-sx spins 44, rounds 663, OS waits 10
Spin rounds per wait: 26.32 RW-shared, 5.65 RW-excl, 15.07 RW-sx
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TRANSACTIONS
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Trx id counter 64117
Purge done for trx's n:o < 64117 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283892906909912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283892906905744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
44004 OS file reads, 113746 OS file writes, 60474 OS fsyncs
2.15 reads/s, 16384 avg bytes/read, 7.50 writes/s, 3.15 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 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)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
9.62 hash searches/s, 23.35 non-hash searches/s
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LOG
---
Log sequence number 30984280
Log flushed up to   30984260
Pages flushed up to 30980810
Last checkpoint at  30960002
0 pending log flushes, 0 pending chkp writes
32336 log i/o's done, 2.15 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 240384
Buffer pool size   1003
Free buffers       737
Database pages     259
Old database pages 0
Modified db pages  27
Percent of dirty pages(LRU & free pages): 2.708
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 43913, created 871, written 71232
2.15 reads/s, 0.04 creates/s, 4.92 writes/s
Buffer pool hit rate 976 / 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: 259, unzip_LRU len: 0
I/O sum[319]:cur[25], 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=3848, Main thread ID=5732, state: sleeping
Number of rows inserted 590, updated 15705, deleted 37, read 3313693
0.00 inserts/s, 1.73 updates/s, 0.00 deletes/s, 9.69 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 26916
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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