Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-11-09 00:56:50 0x528 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 57 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 6210 srv_active, 0 srv_shutdown, 174310 srv_idle
srv_master_thread log flush and writes: 180520
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 361009
OS WAIT ARRAY INFO: signal count 353699
RW-shared spins 2296644, rounds 35401580, OS waits 347855
RW-excl spins 2448, rounds 8969, OS waits 246
RW-sx spins 5, rounds 120, OS waits 4
Spin rounds per wait: 15.41 RW-shared, 3.66 RW-excl, 24.00 RW-sx
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TRANSACTIONS
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Trx id counter 386917
Purge done for trx's n:o < 386917 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283682899480792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283682899476624, 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
24478200 OS file reads, 66348 OS file writes, 47200 OS fsyncs
1 pending reads, 0 pending writes
292.85 reads/s, 16384 avg bytes/read, 4.86 writes/s, 3.72 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, 10 merges
merged operations:
 insert 10, 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 0 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)
2.16 hash searches/s, 10.37 non-hash searches/s
---
LOG
---
Log sequence number 322713825
Log flushed up to   322713825
Pages flushed up to 322713825
Last checkpoint at  322713727
0 pending log flushes, 0 pending chkp writes
24882 log i/o's done, 1.81 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 245392
Buffer pool size   1003
Free buffers       0
Database pages     997
Old database pages 387
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 1
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 182880, not young 237345724
13.35 youngs/s, 1526.46 non-youngs/s
Pages read 24478095, created 474, written 32968
292.85 reads/s, 0.02 creates/s, 2.25 writes/s
Buffer pool hit rate 902 / 1000, young-making rate 4 / 1000 not 509 / 1000
Pages read ahead 87.07/s, evicted without access 7.51/s, Random read ahead 0.00/s
LRU len: 997, unzip_LRU len: 0
I/O sum[10811]:cur[44], 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=3224, Main thread ID=4424, state: sleeping
Number of rows inserted 15, updated 6392, deleted 4, read 369263899
0.00 inserts/s, 0.47 updates/s, 0.00 deletes/s, 2464.61 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 9774
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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