Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-01 03:10:13 0x2984 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 48 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 19766 srv_active, 0 srv_shutdown, 1861934 srv_idle
srv_master_thread log flush and writes: 1881700
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 77647
OS WAIT ARRAY INFO: signal count 21601
RW-shared spins 16838, rounds 393209, OS waits 12350
RW-excl spins 9238, rounds 102856, OS waits 1475
RW-sx spins 859, rounds 16476, OS waits 207
Spin rounds per wait: 23.35 RW-shared, 11.13 RW-excl, 19.18 RW-sx
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TRANSACTIONS
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Trx id counter 147784
Purge done for trx's n:o < 147784 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283519618486488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283519618482320, 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
40578 OS file reads, 92189 OS file writes, 58685 OS fsyncs
3.33 reads/s, 16384 avg bytes/read, 6.12 writes/s, 2.83 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 9, seg size 11, 708 merges
merged operations:
 insert 692, delete mark 612, delete 2
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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
8.37 hash searches/s, 26.79 non-hash searches/s
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LOG
---
Log sequence number 70629217
Log flushed up to   70629217
Pages flushed up to 70622908
Last checkpoint at  70595884
0 pending log flushes, 0 pending chkp writes
36011 log i/o's done, 2.21 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 157752
Buffer pool size   1003
Free buffers       741
Database pages     256
Old database pages 0
Modified db pages  13
Percent of dirty pages(LRU & free pages): 1.303
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 40512, created 461, written 49127
3.33 reads/s, 0.04 creates/s, 3.71 writes/s
Buffer pool hit rate 960 / 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[355]:cur[1], 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=4048, Main thread ID=4796, state: sleeping
Number of rows inserted 2835, updated 2157, deleted 5894, read 16353787
0.00 inserts/s, 1.50 updates/s, 0.00 deletes/s, 10.35 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3042
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 9.98 reads/s
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END OF INNODB MONITOR OUTPUT
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