Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-31 02:46:23 0x1ad4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 62 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 423031 srv_active, 0 srv_shutdown, 1997818 srv_idle
srv_master_thread log flush and writes: 2420849
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 22633109
OS WAIT ARRAY INFO: signal count 12869479
RW-shared spins 14512295, rounds 362582257, OS waits 9621136
RW-excl spins 7879907, rounds 41531127, OS waits 128698
RW-sx spins 3899, rounds 778666, OS waits 25116
Spin rounds per wait: 24.98 RW-shared, 5.27 RW-excl, 199.71 RW-sx
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TRANSACTIONS
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Trx id counter 6652834
Purge done for trx's n:o < 6652834 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283233772232848, 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
817849869 OS file reads, 7463070 OS file writes, 4436405 OS fsyncs
331.03 reads/s, 16384 avg bytes/read, 1.81 writes/s, 0.71 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, 60 merges
merged operations:
 insert 2961, 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)
8.58 hash searches/s, 5.39 non-hash searches/s
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LOG
---
Log sequence number 1620391805
Log flushed up to   1620391805
Pages flushed up to 1620391805
Last checkpoint at  1620391796
0 pending log flushes, 0 pending chkp writes
2633628 log i/o's done, 0.40 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 165264
Buffer pool size   1003
Free buffers       739
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 360819374, not young 29417514102
0.03 youngs/s, 16617.09 non-youngs/s
Pages read 817849804, created 13888, written 4236697
331.03 reads/s, 0.00 creates/s, 1.32 writes/s
Buffer pool hit rate 982 / 1000, young-making rate 0 / 1000 not 896 / 1000
Pages read ahead 293.51/s, evicted without access 14.06/s, Random read ahead 0.00/s
LRU len: 256, unzip_LRU len: 0
I/O sum[1615]: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=3448, Main thread ID=12188, state: sleeping
Number of rows inserted 699337, updated 14219, deleted 0, read 507482094559
0.15 inserts/s, 0.00 updates/s, 0.00 deletes/s, 160063.87 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 27672
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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