Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-26 11:14:20 0xcf50 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 16 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 5269 srv_active, 0 srv_shutdown, 837457 srv_idle
srv_master_thread log flush and writes: 842726
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9761
OS WAIT ARRAY INFO: signal count 6479
RW-shared spins 4348, rounds 129022, OS waits 4033
RW-excl spins 241, rounds 4752, OS waits 123
RW-sx spins 2, rounds 32, OS waits 1
Spin rounds per wait: 29.67 RW-shared, 19.72 RW-excl, 16.00 RW-sx
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TRANSACTIONS
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Trx id counter 221751
Purge done for trx's n:o < 221641 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284670738444504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284670738440336, 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
15156 OS file reads, 50525 OS file writes, 23404 OS fsyncs
1.56 reads/s, 16384 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, 266 merges
merged operations:
 insert 266, 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)
1.37 hash searches/s, 4.62 non-hash searches/s
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LOG
---
Log sequence number 110306540
Log flushed up to   110306540
Pages flushed up to 110306540
Last checkpoint at  110306531
0 pending log flushes, 0 pending chkp writes
14495 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 240384
Buffer pool size   1003
Free buffers       712
Database pages     283
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 175, not young 11248
0.00 youngs/s, 0.00 non-youngs/s
Pages read 15056, created 279, written 33487
1.56 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 887 / 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: 283, unzip_LRU len: 0
I/O sum[30]: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=19460, Main thread ID=27612, state: sleeping
Number of rows inserted 3469, updated 199, deleted 20, read 1279966
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 13.75 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4896
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 6.81 reads/s
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END OF INNODB MONITOR OUTPUT
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