Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-12 21:51:53 0x12f8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 24 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 8635 srv_active, 0 srv_shutdown, 170251 srv_idle
srv_master_thread log flush and writes: 178886
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 12381
OS WAIT ARRAY INFO: signal count 12322
RW-shared spins 10094, rounds 295248, OS waits 9788
RW-excl spins 1307, rounds 11527, OS waits 76
RW-sx spins 29, rounds 958, OS waits 30
Spin rounds per wait: 29.25 RW-shared, 8.82 RW-excl, 33.03 RW-sx
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TRANSACTIONS
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Trx id counter 88651
Purge done for trx's n:o < 88651 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283610223898840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283610223894672, 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
481072 OS file reads, 114281 OS file writes, 71211 OS fsyncs
2.79 reads/s, 16384 avg bytes/read, 3.42 writes/s, 1.71 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 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)
7.12 hash searches/s, 19.75 non-hash searches/s
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LOG
---
Log sequence number 99226426
Log flushed up to   99226406
Pages flushed up to 99220346
Last checkpoint at  99201989
0 pending log flushes, 0 pending chkp writes
40831 log i/o's done, 1.33 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 192808
Buffer pool size   1003
Free buffers       734
Database pages     261
Old database pages 0
Modified db pages  29
Percent of dirty pages(LRU & free pages): 2.912
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 39638, not young 3687366
0.00 youngs/s, 0.00 non-youngs/s
Pages read 480991, created 643, written 62426
2.79 reads/s, 0.00 creates/s, 1.96 writes/s
Buffer pool hit rate 966 / 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: 261, unzip_LRU len: 0
I/O sum[171]:cur[4], 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=1984, Main thread ID=1856, state: sleeping
Number of rows inserted 281, updated 13303, deleted 194, read 36335135
0.00 inserts/s, 0.96 updates/s, 0.00 deletes/s, 23.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 36388
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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