Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

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2025-07-17 11:37:54 0x76952511e6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 40 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 221888 srv_active, 0 srv_shutdown, 255770 srv_idle
srv_master_thread log flush and writes: 477640
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 2108598
OS WAIT ARRAY INFO: signal count 882782
RW-shared spins 154164, rounds 4616788, OS waits 153821
RW-excl spins 1207, rounds 36212, OS waits 1185
RW-sx spins 5, rounds 150, OS waits 5
Spin rounds per wait: 29.95 RW-shared, 30.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 875170
Purge done for trx's n:o < 875170 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 411857870070024, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 411857870065808, 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
211224 OS file reads, 2647379 OS file writes, 1632955 OS fsyncs
0.97 reads/s, 16384 avg bytes/read, 8.40 writes/s, 4.92 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 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
13.75 hash searches/s, 27.47 non-hash searches/s
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LOG
---
Log sequence number 480566465
Log flushed up to   480566465
Pages flushed up to 480566465
Last checkpoint at  480566422
0 pending log flushes, 0 pending chkp writes
873495 log i/o's done, 2.40 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 75640
Buffer pool size   1003
Free buffers       744
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 211189, created 13336, written 1495408
0.97 reads/s, 0.05 creates/s, 5.07 writes/s
Buffer pool hit rate 989 / 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[295]:cur[13], 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=1322, Main thread ID=130382028588736, state: sleeping
Number of rows inserted 0, updated 334162, deleted 0, read 3321116
0.00 inserts/s, 1.05 updates/s, 0.00 deletes/s, 11.57 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4001431
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.00 reads/s
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END OF INNODB MONITOR OUTPUT
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