Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-04-28 02:14:30 0x1570 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 23 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 3126 srv_active, 0 srv_shutdown, 282223 srv_idle
srv_master_thread log flush and writes: 280188
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 103026
OS WAIT ARRAY INFO: signal count 17244
RW-shared spins 0, rounds 16070, OS waits 7842
RW-excl spins 0, rounds 6532, OS waits 213
RW-sx spins 5, rounds 121, OS waits 3
Spin rounds per wait: 16070.00 RW-shared, 6532.00 RW-excl, 24.20 RW-sx
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TRANSACTIONS
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Trx id counter 4105137
Purge done for trx's n:o < 4105137 undo n:o < 0 state: running
History list length 10
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 281475182440880, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 281475182436664, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 281475182432448, 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: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
76269 OS file reads, 43516 OS file writes, 25162 OS fsyncs
1.09 reads/s, 16384 avg bytes/read, 5.09 writes/s, 3.30 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 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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.30 hash searches/s, 136.69 non-hash searches/s
---
LOG
---
Log sequence number 1323617493
Log flushed up to   1323617493
Pages flushed up to 1323617493
Last checkpoint at  1323616168
0 pending log flushes, 0 pending chkp writes
16708 log i/o's done, 1.65 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 2576448
Buffer pool size   1002
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 1091, not young 2805666
0.00 youngs/s, 0.00 non-youngs/s
Pages read 75155, created 447, written 23756
1.09 reads/s, 0.04 creates/s, 2.87 writes/s
Buffer pool hit rate 994 / 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[107]:cur[3], 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=3176, Main thread ID=5092, state: sleeping
Number of rows inserted 28, updated 5840, deleted 0, read 8792995
0.00 inserts/s, 0.52 updates/s, 0.00 deletes/s, 3.39 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 55636
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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