Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-27 16:01:14 0x1b74 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 32 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 3467 srv_active, 0 srv_shutdown, 623701 srv_idle
srv_master_thread log flush and writes: 627168
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 65490
OS WAIT ARRAY INFO: signal count 22377
RW-shared spins 1972, rounds 59081, OS waits 1051
RW-excl spins 77, rounds 2393, OS waits 28
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.96 RW-shared, 31.08 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 54224
Purge done for trx's n:o < 54222 undo n:o < 0 state: running
History list length 92
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283473638912288, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638908120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638903952, 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
14056 OS file reads, 46822 OS file writes, 23017 OS fsyncs
0.47 reads/s, 16384 avg bytes/read, 1.78 writes/s, 1.31 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, 0 merges
merged operations:
 insert 0, 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 0 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 0 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)
3.62 hash searches/s, 8.28 non-hash searches/s
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LOG
---
Log sequence number 35474506
Log flushed up to   35474506
Pages flushed up to 35473020
Last checkpoint at  35472977
0 pending log flushes, 0 pending chkp writes
12502 log i/o's done, 0.66 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       745
Database pages     256
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.499
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 14020, created 488, written 30409
0.47 reads/s, 0.09 creates/s, 0.91 writes/s
Buffer pool hit rate 976 / 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: 256, unzip_LRU len: 0
I/O sum[90]: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=8128, Main thread ID=4204, state: sleeping
Number of rows inserted 0, updated 7815, deleted 0, read 63884
0.00 inserts/s, 0.34 updates/s, 0.00 deletes/s, 3.25 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4640
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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