Storage engines

InnoDB

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

[ Biến | Bể bộ đệm | Trạng thái InnoDB ]

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2026-10-07 13:20:50 0x4cf8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 60 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 3928 srv_active, 0 srv_shutdown, 25799 srv_idle
srv_master_thread log flush and writes: 29727
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1916
OS WAIT ARRAY INFO: signal count 1678
RW-shared spins 1215, rounds 36174, OS waits 1205
RW-excl spins 94, rounds 484, OS waits 8
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.77 RW-shared, 5.15 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 250255
Purge done for trx's n:o < 250255 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283879902937376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879902933208, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879902929040, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
6610 OS file reads, 16724 OS file writes, 9265 OS fsyncs
1.38 reads/s, 16384 avg bytes/read, 4.73 writes/s, 2.10 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 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)
18.77 hash searches/s, 23.95 non-hash searches/s
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LOG
---
Log sequence number 66158257
Log flushed up to   66158237
Pages flushed up to 66155395
Last checkpoint at  66154869
0 pending log flushes, 0 pending chkp writes
5879 log i/o's done, 1.48 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 195312
Buffer pool size   1003
Free buffers       740
Database pages     256
Old database pages 0
Modified db pages  8
Percent of dirty pages(LRU & free pages): 0.802
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 6529, created 209, written 9736
1.38 reads/s, 0.00 creates/s, 3.00 writes/s
Buffer pool hit rate 986 / 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[258]:cur[5], 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=8096, Main thread ID=12100, state: sleeping
Number of rows inserted 21, updated 2604, deleted 0, read 427039
0.00 inserts/s, 0.95 updates/s, 0.00 deletes/s, 29.55 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3016
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.52 reads/s
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END OF INNODB MONITOR OUTPUT
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