Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-20 12:47:57 0x3850 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 5 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 27 srv_active, 0 srv_shutdown, 47486 srv_idle
srv_master_thread log flush and writes: 47513
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 828
OS WAIT ARRAY INFO: signal count 117
RW-shared spins 52, rounds 1560, OS waits 50
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 197772
Purge done for trx's n:o < 197772 undo n:o < 0 state: running
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283999273939376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273935208, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273922704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273926872, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273943544, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273931040, 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
2212 OS file reads, 487 OS file writes, 267 OS fsyncs
2.00 reads/s, 16384 avg bytes/read, 7.00 writes/s, 4.40 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 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)
15.80 hash searches/s, 42.19 non-hash searches/s
---
LOG
---
Log sequence number 139377689
Log flushed up to   139377653
Pages flushed up to 139377653
Last checkpoint at  139369255
0 pending log flushes, 0 pending chkp writes
171 log i/o's done, 1.60 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 333032
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  1
Percent of dirty pages(LRU & free pages): 0.100
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 327, not young 4782
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2076, created 133, written 284
2.00 reads/s, 0.20 creates/s, 4.40 writes/s
Buffer pool hit rate 978 / 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[28]: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=4932, Main thread ID=7240, state: sleeping
Number of rows inserted 0, updated 32, deleted 0, read 89121
0.00 inserts/s, 1.40 updates/s, 0.00 deletes/s, 16.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1851
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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