Storage engines
InnoDB
Supports transactions, row-level locking, and foreign keys
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Trạng thái InnoDB
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2026-02-14 20:49:20 0x7f48141af700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 29 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 9 srv_active, 0 srv_shutdown, 203 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 33
OS WAIT ARRAY INFO: signal count 34
RW-shared spins 1, rounds 1, OS waits 0
RW-excl spins 1, rounds 31, OS waits 2
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1.00 RW-shared, 31.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 9821
Purge done for trx's n:o < 9821 undo n:o < 0 state: running but idle
History list length 83
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421422587812456, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421422587811584, 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
1207 OS file reads, 459 OS file writes, 141 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 2 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 1 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 5 buffer(s)
861.80 hash searches/s, 622.67 non-hash searches/s
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LOG
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Log sequence number 50965328
Log buffer assigned up to 50965328
Log buffer completed up to 50965328
Log written up to 50965328
Log flushed up to 50965328
Added dirty pages up to 50965328
Pages flushed up to 50965328
Last checkpoint at 50965328
112 log i/o's done, 0.00 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 477866
Buffer pool size 8192
Free buffers 6922
Database pages 1257
Old database pages 444
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 153, not young 760
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1114, created 230, written 257
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: 1257, unzip_LRU len: 0
I/O sum[1]: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=139947102123776 , state=sleeping
Number of rows inserted 16396, updated 350, deleted 0, read 625007
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1105.27 reads/s
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END OF INNODB MONITOR OUTPUT
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