Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-14 00:43:42 0x365c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 31 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 95198 srv_active, 0 srv_shutdown, 43619 srv_idle
srv_master_thread log flush and writes: 138817
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 107158
OS WAIT ARRAY INFO: signal count 105657
RW-shared spins 50452, rounds 1379151, OS waits 45603
RW-excl spins 718, rounds 15402, OS waits 466
RW-sx spins 45, rounds 1202, OS waits 35
Spin rounds per wait: 27.34 RW-shared, 21.45 RW-excl, 26.71 RW-sx
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TRANSACTIONS
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Trx id counter 29535609
Purge done for trx's n:o < 29535609 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284143025217752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284143025213584, 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
373737 OS file reads, 1440477 OS file writes, 807679 OS fsyncs
1.52 reads/s, 16384 avg bytes/read, 12.19 writes/s, 6.55 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 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 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)
35.55 hash searches/s, 77.74 non-hash searches/s
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LOG
---
Log sequence number 18928385187
Log flushed up to   18928385187
Pages flushed up to 18928384176
Last checkpoint at  18928352409
0 pending log flushes, 0 pending chkp writes
435711 log i/o's done, 3.48 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 247896
Buffer pool size   1003
Free buffers       742
Database pages     256
Old database pages 0
Modified db pages  16
Percent of dirty pages(LRU & free pages): 1.602
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 85, not young 7009
0.00 youngs/s, 0.00 non-youngs/s
Pages read 373632, created 11580, written 851861
3.00 reads/s, 0.00 creates/s, 9.00 writes/s
Buffer pool hit rate 988 / 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: 256, unzip_LRU len: 0
I/O sum[443]:cur[1], 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=5184, Main thread ID=6900, state: sleeping
Number of rows inserted 205, updated 234628, deleted 0, read 12415244
0.00 inserts/s, 1.97 updates/s, 0.00 deletes/s, 31.84 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 685537
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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