Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
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Variables
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Reserva de búfers
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Estado del InnoDB
]
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2026-11-13 03:42:07 0x11f4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 15 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 645341 srv_active, 0 srv_shutdown, 1107712 srv_idle
srv_master_thread log flush and writes: 1753053
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 24216777
OS WAIT ARRAY INFO: signal count 3091229
RW-shared spins 455148, rounds 13585765, OS waits 451033
RW-excl spins 10513, rounds 272048, OS waits 8577
RW-sx spins 304, rounds 9177, OS waits 262
Spin rounds per wait: 29.85 RW-shared, 25.88 RW-excl, 30.19 RW-sx
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TRANSACTIONS
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Trx id counter 2332857
Purge done for trx's n:o < 2332857 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283227723141432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283227723137256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283227723133080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
6129358 OS file reads, 7762237 OS file writes, 4898966 OS fsyncs
14.80 reads/s, 16384 avg bytes/read, 12.07 writes/s, 6.47 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, 680 merges
merged operations:
insert 731, delete mark 51, delete 7
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 3 buffer(s)
33.13 hash searches/s, 56.73 non-hash searches/s
---
LOG
---
Log sequence number 1367154810
Log flushed up to 1367154790
Pages flushed up to 1367142140
Last checkpoint at 1367142140
0 pending log flushes, 0 pending chkp writes
2568544 log i/o's done, 3.73 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 851360
Buffer pool size 1003
Free buffers 727
Database pages 266
Old database pages 0
Modified db pages 29
Percent of dirty pages(LRU & free pages): 2.918
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 839, not young 20636
0.00 youngs/s, 0.00 non-youngs/s
Pages read 6129014, created 51277, written 4307165
14.42 reads/s, 0.17 creates/s, 7.83 writes/s
Buffer pool hit rate 975 / 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: 266, unzip_LRU len: 0
I/O sum[564]:cur[22], 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=8480, Main thread ID=9588, state: sleeping
Number of rows inserted 277, updated 978902, deleted 0, read 15072919599
0.00 inserts/s, 2.27 updates/s, 0.00 deletes/s, 2935.20 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 97812
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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