Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-27 08:37:16 0x1f70 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 53 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 2639 srv_active, 0 srv_shutdown, 598301 srv_idle
srv_master_thread log flush and writes: 600940
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 49650
OS WAIT ARRAY INFO: signal count 16934
RW-shared spins 1462, rounds 43805, OS waits 752
RW-excl spins 52, rounds 1643, OS waits 24
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.96 RW-shared, 31.60 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 50464
Purge done for trx's n:o < 50464 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283473638908120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638903952, 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
10908 OS file reads, 35695 OS file writes, 17418 OS fsyncs
1.08 reads/s, 16384 avg bytes/read, 0.57 writes/s, 0.47 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 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 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)
0.57 hash searches/s, 1.32 non-hash searches/s
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LOG
---
Log sequence number 33172320
Log flushed up to   33170756
Pages flushed up to 33169654
Last checkpoint at  33168439
0 pending log flushes, 0 pending chkp writes
9401 log i/o's done, 0.30 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       735
Database pages     266
Old database pages 0
Modified db pages  69
Percent of dirty pages(LRU & free pages): 6.886
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 10872, created 461, written 23323
1.08 reads/s, 0.00 creates/s, 0.21 writes/s
Buffer pool hit rate 850 / 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: 266, unzip_LRU len: 0
I/O sum[20]:cur[48], 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=8128, Main thread ID=4204, state: sleeping
Number of rows inserted 0, updated 5937, deleted 0, read 50524
0.00 inserts/s, 0.09 updates/s, 0.00 deletes/s, 0.58 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3465
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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