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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2026-07-12 19:16:09 0x7a71917b46c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 31 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 10417 srv_active, 0 srv_shutdown, 3138567 srv_idle
srv_master_thread log flush and writes: 3148894
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 546053
OS WAIT ARRAY INFO: signal count 116087
RW-shared spins 5055, rounds 113665, OS waits 3160
RW-excl spins 2772, rounds 26898, OS waits 244
RW-sx spins 498, rounds 7586, OS waits 60
Spin rounds per wait: 22.49 RW-shared, 9.70 RW-excl, 15.23 RW-sx
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TRANSACTIONS
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Trx id counter 1065686
Purge done for trx's n:o < 1065686 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 416103202603392, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416103202599176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416103202594960, 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: 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
476070 OS file reads, 157593 OS file writes, 79470 OS fsyncs
5.84 reads/s, 16384 avg bytes/read, 15.23 writes/s, 6.64 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, 1149 merges
merged operations:
 insert 1606, delete mark 1200, delete 694
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 2 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)
62.71 hash searches/s, 43.39 non-hash searches/s
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LOG
---
Log sequence number 969505733
Log flushed up to   969505713
Pages flushed up to 969467596
Last checkpoint at  969461889
0 pending log flushes, 0 pending chkp writes
41065 log i/o's done, 4.32 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       748
Database pages     246
Old database pages 0
Modified db pages  45
Percent of dirty pages(LRU & free pages): 4.523
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 22858, not young 335083
0.00 youngs/s, 0.00 non-youngs/s
Pages read 475960, created 1811, written 102790
5.84 reads/s, 0.23 creates/s, 9.90 writes/s
Buffer pool hit rate 982 / 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: 246, unzip_LRU len: 0
I/O sum[1076]:cur[23], 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=4113, Main thread ID=134627561830080, state: sleeping
Number of rows inserted 2415, updated 17872, deleted 6951, read 4782119
0.00 inserts/s, 3.45 updates/s, 0.00 deletes/s, 152.22 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 86624
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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