Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-14 11:53:57 0x5b50 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 51 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 1 srv_active, 0 srv_shutdown, 8033 srv_idle
srv_master_thread log flush and writes: 8034
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 35
OS WAIT ARRAY INFO: signal count 27
RW-shared spins 23, rounds 699, OS waits 23
RW-excl spins 109, rounds 461, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.39 RW-shared, 4.23 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 13092
Purge done for trx's n:o < 13045 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284202708709520, 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: [63, 64, 4, 0] ,
 ibuf aio reads:, log i/o's:, sync i/o's:
Pending flushes (fsync) log: 0; buffer pool: 0
1014 OS file reads, 261 OS file writes, 46 OS fsyncs
0.00 reads/s, 0 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 1 buffer(s)
Hash table size 4441, node heap has 2 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 0 buffer(s)
1.55 hash searches/s, 0.27 non-hash searches/s
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LOG
---
Log sequence number 5202009
Log flushed up to   5202009
Pages flushed up to 5166553
Last checkpoint at  5166553
0 pending log flushes, 0 pending chkp writes
49 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 242888
Buffer pool size   1003
Free buffers       396
Database pages     600
Old database pages 201
Modified db pages  140
Percent of dirty pages(LRU & free pages): 14.042
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 131, single page 0
Pages made young 150, not young 840
0.00 youngs/s, 0.00 non-youngs/s
Pages read 913, created 136, written 86
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 600, unzip_LRU len: 0
I/O sum[0]: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=3772, Main thread ID=17912, state: sleeping
Number of rows inserted 0, updated 0, deleted 0, read 41609
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 3.53 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 21862
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 19.25 reads/s
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END OF INNODB MONITOR OUTPUT
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