Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-11 22:47:27 0x2cf4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 55 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 194 srv_active, 0 srv_shutdown, 16700 srv_idle
srv_master_thread log flush and writes: 16894
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 14752
OS WAIT ARRAY INFO: signal count 415
RW-shared spins 225, rounds 6474, OS waits 200
RW-excl spins 42, rounds 1303, OS waits 34
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 28.77 RW-shared, 31.02 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 21848
Purge done for trx's n:o < 21848 undo n:o < 0 state: running
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283834829734248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829730080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829738416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829725912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283834829721744, 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
2245 OS file reads, 3165 OS file writes, 1536 OS fsyncs
1.73 reads/s, 16384 avg bytes/read, 6.78 writes/s, 2.69 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, 19 merges
merged operations:
 insert 19, 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 0 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
4.18 hash searches/s, 295.25 non-hash searches/s
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LOG
---
Log sequence number 23937341
Log flushed up to   23937321
Pages flushed up to 23934566
Last checkpoint at  23934557
0 pending log flushes, 0 pending chkp writes
1002 log i/o's done, 1.93 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 230368
Buffer pool size   1003
Free buffers       741
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 13, not young 212
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2150, created 166, written 1982
2.67 reads/s, 0.11 creates/s, 7.22 writes/s
Buffer pool hit rate 994 / 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: 258, unzip_LRU len: 0
I/O sum[346]:cur[2], 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=6984, Main thread ID=8840, state: sleeping
Number of rows inserted 9, updated 424, deleted 0, read 243781
0.00 inserts/s, 1.33 updates/s, 0.00 deletes/s, 7.20 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1650
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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