Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-01 23:35:42 0xc2b78 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 29 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 41035 srv_active, 0 srv_shutdown, 657611 srv_idle
srv_master_thread log flush and writes: 698643
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1911809
OS WAIT ARRAY INFO: signal count 310014
RW-shared spins 205034, rounds 5860741, OS waits 168885
RW-excl spins 37499, rounds 371981, OS waits 8219
RW-sx spins 39236, rounds 1370635, OS waits 39864
Spin rounds per wait: 28.58 RW-shared, 9.92 RW-excl, 34.93 RW-sx
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TRANSACTIONS
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Trx id counter 9906801
Purge done for trx's n:o < 9906801 undo n:o < 0 state: running
History list length 30
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283607390572688, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283607390589360, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283607390581024, 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
1213084 OS file reads, 1366330 OS file writes, 598976 OS fsyncs
3.93 reads/s, 16384 avg bytes/read, 10.45 writes/s, 5.28 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 3, seg size 5, 8129 merges
merged operations:
 insert 9622, delete mark 585, delete 131
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)
10.90 hash searches/s, 25.48 non-hash searches/s
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LOG
---
Log sequence number 2950820740
Log flushed up to   2950820740
Pages flushed up to 2950801191
Last checkpoint at  2950797363
0 pending log flushes, 0 pending chkp writes
419987 log i/o's done, 2.86 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 340544
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  34
Percent of dirty pages(LRU & free pages): 3.414
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1056900, not young 137332240
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1212930, created 7142, written 884056
3.93 reads/s, 0.07 creates/s, 6.62 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: 258, unzip_LRU len: 0
I/O sum[510]:cur[3], 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=3040, Main thread ID=4900, state: sleeping
Number of rows inserted 7445, updated 53677, deleted 707, read 960847195
0.00 inserts/s, 1.97 updates/s, 0.00 deletes/s, 157.13 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 78220
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 7.38 reads/s
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END OF INNODB MONITOR OUTPUT
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