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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2026-05-13 08:27:08 0x72f27ccb86c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 35 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 15030 srv_active, 0 srv_shutdown, 1451964 srv_idle
srv_master_thread log flush and writes: 1466977
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 833163
OS WAIT ARRAY INFO: signal count 156565
RW-shared spins 14857, rounds 354958, OS waits 10107
RW-excl spins 8756, rounds 69726, OS waits 821
RW-sx spins 802, rounds 15237, OS waits 283
Spin rounds per wait: 23.89 RW-shared, 7.96 RW-excl, 19.00 RW-sx
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TRANSACTIONS
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Trx id counter 944879
Purge done for trx's n:o < 944879 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 407860719329544, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 407860719325328, 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: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
1067209 OS file reads, 313630 OS file writes, 144320 OS fsyncs
0.09 reads/s, 16384 avg bytes/read, 1.03 writes/s, 0.74 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, 3718 merges
merged operations:
 insert 4923, delete mark 2071, delete 1305
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 1 buffer(s)
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.60 hash searches/s, 2.77 non-hash searches/s
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LOG
---
Log sequence number 904731128
Log flushed up to   904731128
Pages flushed up to 904731128
Last checkpoint at  904731085
0 pending log flushes, 0 pending chkp writes
79941 log i/o's done, 0.43 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 258640
Buffer pool size   1003
Free buffers       739
Database pages     256
Old database pages 0
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 29608, not young 777571
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1067099, created 3875, written 212252
0.09 reads/s, 0.00 creates/s, 0.49 writes/s
Buffer pool hit rate 992 / 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: 256, unzip_LRU len: 0
I/O sum[28]: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=2507, Main thread ID=126385016256192, state: sleeping
Number of rows inserted 9735, updated 24242, deleted 13989, read 15377965
0.00 inserts/s, 0.11 updates/s, 0.00 deletes/s, 1.37 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 68634
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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