Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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Trạng thái InnoDB
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2025-09-14 05:35:23 0x7f9bb81f2700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 32 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 9 srv_active, 0 srv_shutdown, 266 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 18
OS WAIT ARRAY INFO: signal count 18
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9783
Purge done for trx's n:o < 9783 undo n:o < 0 state: running but idle
History list length 67
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421781935258216, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421781935257344, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
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I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1190 OS file reads, 347 OS file writes, 121 OS fsyncs
0.22 reads/s, 14189 avg bytes/read, 1.16 writes/s, 0.66 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 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
168.34 hash searches/s, 40.50 non-hash searches/s
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LOG
---
Log sequence number 50957779
Log buffer assigned up to 50957779
Log buffer completed up to 50957779
Log written up to 50957779
Log flushed up to 50957779
Added dirty pages up to 50957779
Pages flushed up to 50957779
Last checkpoint at 50957779
69 log i/o's done, 0.41 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 137363456
Dictionary memory allocated 535436
Buffer pool size 8192
Free buffers 6947
Database pages 1234
Old database pages 475
Modified db pages 0
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 1091, created 143, written 226
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 1234, unzip_LRU len: 0
I/O sum[0]: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=367, Main thread ID=140306450421504 , state=sleeping
Number of rows inserted 4, updated 334, deleted 0, read 155864
0.03 inserts/s, 0.16 updates/s, 0.00 deletes/s, 309.30 reads/s
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END OF INNODB MONITOR OUTPUT
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