Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-15 23:04:18 0x2d50 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 63 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 8894 srv_active, 0 srv_shutdown, 6946220 srv_idle
srv_master_thread log flush and writes: 6955114
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 7101
OS WAIT ARRAY INFO: signal count 6065
RW-shared spins 4353, rounds 114625, OS waits 3709
RW-excl spins 1433, rounds 8040, OS waits 80
RW-sx spins 44, rounds 663, OS waits 10
Spin rounds per wait: 26.33 RW-shared, 5.61 RW-excl, 15.07 RW-sx
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TRANSACTIONS
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Trx id counter 61446
Purge done for trx's n:o < 61446 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283892906914080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283892906909912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283892906905744, 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
40930 OS file reads, 108082 OS file writes, 58036 OS fsyncs
3.92 reads/s, 16384 avg bytes/read, 8.51 writes/s, 4.29 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 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)
12.29 hash searches/s, 30.86 non-hash searches/s
---
LOG
---
Log sequence number 29293500
Log flushed up to   29293480
Pages flushed up to 29269499
Last checkpoint at  29268322
0 pending log flushes, 0 pending chkp writes
30680 log i/o's done, 2.94 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 240384
Buffer pool size   1003
Free buffers       734
Database pages     262
Old database pages 0
Modified db pages  40
Percent of dirty pages(LRU & free pages): 4.012
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 40839, created 807, written 67569
3.92 reads/s, 0.08 creates/s, 4.95 writes/s
Buffer pool hit rate 968 / 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: 262, unzip_LRU len: 0
I/O sum[536]:cur[11], 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=3848, Main thread ID=5732, state: sleeping
Number of rows inserted 590, updated 14370, deleted 37, read 3283545
0.00 inserts/s, 2.10 updates/s, 0.00 deletes/s, 31.71 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 26246
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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