Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-10 18:36:20 0xa6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 46 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 14717 srv_active, 0 srv_shutdown, 10072 srv_idle
srv_master_thread log flush and writes: 24789
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 554767
OS WAIT ARRAY INFO: signal count 123844
RW-shared spins 9305, rounds 275209, OS waits 8957
RW-excl spins 1177, rounds 7716, OS waits 113
RW-sx spins 4, rounds 90, OS waits 2
Spin rounds per wait: 29.58 RW-shared, 6.56 RW-excl, 22.50 RW-sx
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TRANSACTIONS
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Trx id counter 888536
Purge done for trx's n:o < 888536 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283859989418416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989414248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989410080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989405912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989401744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
107887 OS file reads, 204744 OS file writes, 115839 OS fsyncs
2.07 reads/s, 16384 avg bytes/read, 8.15 writes/s, 4.63 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 3, seg size 5, 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)
4.13 hash searches/s, 10.91 non-hash searches/s
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LOG
---
Log sequence number 120445150
Log flushed up to   120445130
Pages flushed up to 120444756
Last checkpoint at  120440215
0 pending log flushes, 0 pending chkp writes
62243 log i/o's done, 2.39 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 4306880
Buffer pool size   1003
Free buffers       738
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 303, not young 43765
0.00 youngs/s, 0.00 non-youngs/s
Pages read 106163, created 1742, written 123382
2.07 reads/s, 0.00 creates/s, 5.07 writes/s
Buffer pool hit rate 989 / 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: 257, unzip_LRU len: 0
I/O sum[323]:cur[14], 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=56288, Main thread ID=47692, state: sleeping
Number of rows inserted 1007, updated 27436, deleted 1007, read 2664640
0.02 inserts/s, 0.91 updates/s, 0.02 deletes/s, 38.54 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 303943
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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