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 21:36:31 0x31fc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 17 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8744 srv_active, 0 srv_shutdown, 109065 srv_idle
srv_master_thread log flush and writes: 117809
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 143403
OS WAIT ARRAY INFO: signal count 11654
RW-shared spins 2604, rounds 77746, OS waits 2447
RW-excl spins 132, rounds 1689, OS waits 39
RW-sx spins 5, rounds 180, OS waits 5
Spin rounds per wait: 29.86 RW-shared, 12.80 RW-excl, 36.00 RW-sx
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TRANSACTIONS
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Trx id counter 138042
Purge done for trx's n:o < 138042 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283374649241744, 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 283374649245912, 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
24062 OS file reads, 92412 OS file writes, 53267 OS fsyncs
2.94 reads/s, 16384 avg bytes/read, 13.53 writes/s, 4.06 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, 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
12.94 hash searches/s, 28.82 non-hash searches/s
---
LOG
---
Log sequence number 51502895
Log flushed up to   51502875
Pages flushed up to 51501592
Last checkpoint at  51486944
0 pending log flushes, 0 pending chkp writes
26541 log i/o's done, 2.76 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 155248
Buffer pool size   1003
Free buffers       742
Database pages     257
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.300
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 23997, created 617, written 56409
2.94 reads/s, 0.24 creates/s, 10.23 writes/s
Buffer pool hit rate 972 / 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: 257, unzip_LRU len: 0
I/O sum[424]:cur[44], 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 12714, deleted 27, read 15721866
0.00 inserts/s, 2.06 updates/s, 0.00 deletes/s, 12.71 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 28438
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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