Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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Trạng thái InnoDB
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2025-09-19 01:02:09 0x7fcf4c14b700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 3 srv_active, 0 srv_shutdown, 77 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 3
OS WAIT ARRAY INFO: signal count 3
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 9742
Purge done for trx's n:o < 9740 undo n:o < 0 state: running but idle
History list length 49
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422003812801128, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 422003812800256, 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
1137 OS file reads, 247 OS file writes, 64 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.75 writes/s, 0.60 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 0 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 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
652.57 hash searches/s, 427.58 non-hash searches/s
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LOG
---
Log sequence number 50950584
Log buffer assigned up to 50950584
Log buffer completed up to 50950584
Log written up to 50950584
Log flushed up to 50950584
Added dirty pages up to 50950584
Pages flushed up to 50950584
Last checkpoint at 50950584
33 log i/o's done, 0.25 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 422087
Buffer pool size 8192
Free buffers 6993
Database pages 1190
Old database pages 459
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 1048, created 142, written 173
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: 1190, 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=369, Main thread ID=140528323606272 , state=sleeping
Number of rows inserted 4, updated 316, deleted 0, read 49646
0.05 inserts/s, 0.00 updates/s, 0.00 deletes/s, 880.31 reads/s
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END OF INNODB MONITOR OUTPUT
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