Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-27 07:06:07 0x1cfb8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 61 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 1287 srv_active, 0 srv_shutdown, 1002524 srv_idle
srv_master_thread log flush and writes: 1003811
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 8594
OS WAIT ARRAY INFO: signal count 6444
RW-shared spins 3090, rounds 90623, OS waits 3002
RW-excl spins 251, rounds 1831, OS waits 31
RW-sx spins 19, rounds 316, OS waits 6
Spin rounds per wait: 29.33 RW-shared, 7.29 RW-excl, 16.63 RW-sx
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TRANSACTIONS
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Trx id counter 79540
Purge done for trx's n:o < 79540 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282994070081680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282994070085848, 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
12937 OS file reads, 24474 OS file writes, 14711 OS fsyncs
0.31 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 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 0 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)
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, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 20977458
Log flushed up to   20977458
Pages flushed up to 20977458
Last checkpoint at  20977449
0 pending log flushes, 0 pending chkp writes
9980 log i/o's done, 0.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 380608
Buffer pool size   1003
Free buffers       553
Database pages     445
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 162, not young 1658
0.00 youngs/s, 0.00 non-youngs/s
Pages read 12779, created 279, written 12874
0.31 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 999 / 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: 445, unzip_LRU len: 0
I/O sum[19]: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=217672, Main thread ID=97272, state: sleeping
Number of rows inserted 1260, updated 1292, deleted 322, read 327595293
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2686.99 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 42150
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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