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 01:42:12 0x6230 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 422774 srv_active, 0 srv_shutdown, 1994263 srv_idle
srv_master_thread log flush and writes: 2417037
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 22559697
OS WAIT ARRAY INFO: signal count 12808602
RW-shared spins 14434284, rounds 360536301, OS waits 9563725
RW-excl spins 7870395, rounds 41486475, OS waits 128535
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 6651478
Purge done for trx's n:o < 6651478 undo n:o < 0 state: running but idle
History list length 7
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
816812669 OS file reads, 7456583 OS file writes, 4433090 OS fsyncs
2.27 reads/s, 16384 avg bytes/read, 0.59 writes/s, 0.41 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)
0.00 hash searches/s, 0.16 non-hash searches/s
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LOG
---
Log sequence number 1620155441
Log flushed up to   1620155441
Pages flushed up to 1620155441
Last checkpoint at  1620155432
0 pending log flushes, 0 pending chkp writes
2631681 log i/o's done, 0.22 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 165264
Buffer pool size   1003
Free buffers       676
Database pages     319
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 360812331, not young 29352331143
0.00 youngs/s, 0.89 non-youngs/s
Pages read 816812604, created 13872, written 4232497
2.27 reads/s, 0.00 creates/s, 0.32 writes/s
Buffer pool hit rate 959 / 1000, young-making rate 0 / 1000 not 15 / 1000
Pages read ahead 0.86/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 319, unzip_LRU len: 0
I/O sum[2185]: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 698659, updated 14219, deleted 0, read 506843707117
0.08 inserts/s, 0.00 updates/s, 0.00 deletes/s, 471.83 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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