Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-09-13 21:43:57 0x4260 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 60 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 1976 srv_active, 0 srv_shutdown, 133488 srv_idle
srv_master_thread log flush and writes: 135464
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 5452
OS WAIT ARRAY INFO: signal count 5293
RW-shared spins 4403, rounds 127542, OS waits 4208
RW-excl spins 1031, rounds 7960, OS waits 68
RW-sx spins 308, rounds 9215, OS waits 202
Spin rounds per wait: 28.97 RW-shared, 7.72 RW-excl, 29.92 RW-sx
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TRANSACTIONS
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Trx id counter 79536
Purge done for trx's n:o < 79536 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283578441351384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283578441347216, 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: 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
155322 OS file reads, 51315 OS file writes, 26567 OS fsyncs
4.33 reads/s, 16384 avg bytes/read, 0.02 writes/s, 0.02 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 1 buffer(s)
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 2 buffer(s)
33.57 hash searches/s, 6.22 non-hash searches/s
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LOG
---
Log sequence number 56228459
Log flushed up to   56228439
Pages flushed up to 56227434
Last checkpoint at  56227425
0 pending log flushes, 0 pending chkp writes
16918 log i/o's done, 0.02 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 190304
Buffer pool size   1003
Free buffers       477
Database pages     516
Old database pages 187
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.302
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 6258, not young 15832
0.40 youngs/s, 0.10 non-youngs/s
Pages read 155240, created 355, written 31018
4.33 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 982 / 1000, young-making rate 1 / 1000 not 0 / 1000
Pages read ahead 1.58/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 516, unzip_LRU len: 0
I/O sum[168]: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=8944, Main thread ID=12704, state: sleeping
Number of rows inserted 3984, updated 2253, deleted 1117, read 39607386
0.00 inserts/s, 0.02 updates/s, 0.00 deletes/s, 311.73 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 919
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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