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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2026-10-23 20:25:10 0x19c INNODB MONITOR OUTPUT
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Per second averages calculated from the last 12 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8594 srv_active, 0 srv_shutdown, 104965 srv_idle
srv_master_thread log flush and writes: 113559
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 134328
OS WAIT ARRAY INFO: signal count 11434
RW-shared spins 2502, rounds 74835, OS waits 2378
RW-excl spins 125, rounds 1512, OS waits 37
RW-sx spins 5, rounds 180, OS waits 5
Spin rounds per wait: 29.91 RW-shared, 12.10 RW-excl, 36.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 136572
Purge done for trx's n:o < 136572 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283374649262584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649258416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649245912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649254248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649250080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283374649241744, 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
22753 OS file reads, 88877 OS file writes, 51808 OS fsyncs
13.17 reads/s, 16384 avg bytes/read, 9.75 writes/s, 9.42 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 2 merges
merged operations:
 insert 6, 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
33.25 hash searches/s, 88.16 non-hash searches/s
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LOG
---
Log sequence number 50577436
Log flushed up to   50577400
Pages flushed up to 50501991
Last checkpoint at  50498528
0 pending log flushes, 0 pending chkp writes
25542 log i/o's done, 7.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 155248
Buffer pool size   1003
Free buffers       740
Database pages     258
Old database pages 0
Modified db pages  140
Percent of dirty pages(LRU & free pages): 14.014
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 22688, created 578, written 54074
13.17 reads/s, 0.00 creates/s, 1.58 writes/s
Buffer pool hit rate 957 / 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[455]:cur[11], 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=3672, Main thread ID=5372, state: sleeping
Number of rows inserted 116, updated 11980, deleted 27, read 15700864
0.00 inserts/s, 5.83 updates/s, 0.00 deletes/s, 168.90 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 27695
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 61.91 reads/s
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END OF INNODB MONITOR OUTPUT
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