Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-09-13 05:19:40 0x1578 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 33 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 10380 srv_active, 0 srv_shutdown, 801503 srv_idle
srv_master_thread log flush and writes: 811883
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 18111275
OS WAIT ARRAY INFO: signal count 15408241
RW-shared spins 0, rounds 34453463, OS waits 15538031
RW-excl spins 0, rounds 27831149, OS waits 59656
RW-sx spins 4149, rounds 60762, OS waits 1520
Spin rounds per wait: 34453463.00 RW-shared, 27831149.00 RW-excl, 14.64 RW-sx
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TRANSACTIONS
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Trx id counter 187914727
Purge done for trx's n:o < 187914727 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283515414364472, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 283515414360256, not started
0 lock struct(s), heap size 1136, 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
335810931 OS file reads, 1144400 OS file writes, 383159 OS fsyncs
2947.30 reads/s, 16384 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 395, seg size 397, 145783 merges
merged operations:
 insert 459245, delete mark 199664, delete 118514
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, 0.76 non-hash searches/s
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LOG
---
Log sequence number 108290388460
Log flushed up to   108290388460
Pages flushed up to 108290388460
Last checkpoint at  108290388451
0 pending log flushes, 0 pending chkp writes
267439 log i/o's done, 0.00 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 1223424
Buffer pool size   1002
Free buffers       0
Database pages     994
Old database pages 386
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 273421, not young 5241805009
0.00 youngs/s, 45976.85 non-youngs/s
Pages read 335810442, created 9361, written 840008
2947.30 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 935 / 1000, young-making rate 0 / 1000 not 999 / 1000
Pages read ahead 2857.61/s, evicted without access 9.55/s, Random read ahead 0.00/s
LRU len: 994, unzip_LRU len: 0
I/O sum[10477]: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=8908, Main thread ID=10608, state: sleeping
Number of rows inserted 176300, updated 22599, deleted 49137, read 41063278460
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 361093.60 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1621047
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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