Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-14 09:05:19 0x3664 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: 15060 srv_active, 0 srv_shutdown, 5282846 srv_idle
srv_master_thread log flush and writes: 5297906
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 139816
OS WAIT ARRAY INFO: signal count 139369
RW-shared spins 157831, rounds 4375749, OS waits 127467
RW-excl spins 488, rounds 4094, OS waits 56
RW-sx spins 3, rounds 0, OS waits 0
Spin rounds per wait: 27.72 RW-shared, 8.39 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 38032
Purge done for trx's n:o < 38032 undo n:o < 0 state: running but idle
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283234296565976, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283234296561808, 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
343852 OS file reads, 194366 OS file writes, 140975 OS fsyncs
0.11 reads/s, 16384 avg bytes/read, 1.36 writes/s, 0.98 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 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
0.74 hash searches/s, 1.57 non-hash searches/s
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LOG
---
Log sequence number 89244327
Log flushed up to   89244327
Pages flushed up to 89244327
Last checkpoint at  89244318
0 pending log flushes, 0 pending chkp writes
90713 log i/o's done, 0.64 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 207832
Buffer pool size   1003
Free buffers       742
Database pages     256
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 1245, not young 5020625
0.00 youngs/s, 0.00 non-youngs/s
Pages read 343765, created 717, written 86993
0.11 reads/s, 0.00 creates/s, 0.60 writes/s
Buffer pool hit rate 983 / 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[38]: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=12996, Main thread ID=13988, state: sleeping
Number of rows inserted 102, updated 16944, deleted 1, read 72136615
0.00 inserts/s, 0.11 updates/s, 0.00 deletes/s, 0.72 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 28950
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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