Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 22:07:25 0x5254 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 36 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 9223 srv_active, 0 srv_shutdown, 117229 srv_idle
srv_master_thread log flush and writes: 126452
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 189474
OS WAIT ARRAY INFO: signal count 66037
RW-shared spins 5037, rounds 149138, OS waits 4504
RW-excl spins 298, rounds 1932, OS waits 30
RW-sx spins 10, rounds 107, OS waits 3
Spin rounds per wait: 29.61 RW-shared, 6.48 RW-excl, 10.70 RW-sx
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TRANSACTIONS
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Trx id counter 50640
Purge done for trx's n:o < 50640 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284272592671008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272592662672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284272592666840, 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
35134 OS file reads, 117761 OS file writes, 65274 OS fsyncs
0.69 reads/s, 16384 avg bytes/read, 3.03 writes/s, 1.33 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, 12 merges
merged operations:
 insert 12, 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 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)
3.75 hash searches/s, 8.78 non-hash searches/s
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LOG
---
Log sequence number 34949409
Log flushed up to   34949389
Pages flushed up to 34944274
Last checkpoint at  34944265
0 pending log flushes, 0 pending chkp writes
35816 log i/o's done, 0.97 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 275440
Buffer pool size   1003
Free buffers       736
Database pages     259
Old database pages 0
Modified db pages  9
Percent of dirty pages(LRU & free pages): 0.904
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 35020, created 801, written 70715
0.69 reads/s, 0.03 creates/s, 1.92 writes/s
Buffer pool hit rate 979 / 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: 259, unzip_LRU len: 0
I/O sum[136]:cur[2], 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=4652, Main thread ID=6852, state: sleeping
Number of rows inserted 111, updated 17115, deleted 10, read 24284546
0.00 inserts/s, 0.69 updates/s, 0.00 deletes/s, 3.58 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 41054
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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