Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-01 21:09:16 0x29e8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 5 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 12225 srv_active, 0 srv_shutdown, 180875 srv_idle
srv_master_thread log flush and writes: 193100
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 20380
OS WAIT ARRAY INFO: signal count 20142
RW-shared spins 12932, rounds 302375, OS waits 9135
RW-excl spins 3601, rounds 23656, OS waits 318
RW-sx spins 265, rounds 3228, OS waits 23
Spin rounds per wait: 23.38 RW-shared, 6.57 RW-excl, 12.18 RW-sx
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TRANSACTIONS
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Trx id counter 40449
Purge done for trx's n:o < 40449 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284581065167352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284581065163184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284581065154848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284581065146512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284581065159016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284581065150680, 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
570470 OS file reads, 446377 OS file writes, 107044 OS fsyncs
22.80 reads/s, 16384 avg bytes/read, 8.20 writes/s, 5.00 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, 1093 merges
merged operations:
 insert 998, delete mark 363, delete 93
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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
22.00 hash searches/s, 55.79 non-hash searches/s
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LOG
---
Log sequence number 2659356117
Log flushed up to   2659356097
Pages flushed up to 2659336310
Last checkpoint at  2659336213
0 pending log flushes, 0 pending chkp writes
49783 log i/o's done, 3.40 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       753
Database pages     244
Old database pages 0
Modified db pages  24
Percent of dirty pages(LRU & free pages): 2.405
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 93694, not young 195749
0.00 youngs/s, 0.00 non-youngs/s
Pages read 570423, created 76660, written 373292
22.80 reads/s, 0.00 creates/s, 4.00 writes/s
Buffer pool hit rate 906 / 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: 244, unzip_LRU len: 0
I/O sum[595]:cur[70], 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=3556, Main thread ID=5740, state: sleeping
Number of rows inserted 2529, updated 15542, deleted 1534, read 15265331
0.00 inserts/s, 3.00 updates/s, 0.00 deletes/s, 102.78 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 19981
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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