Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-25 14:56:09 0x1598 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 14 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 5710 srv_active, 0 srv_shutdown, 38981 srv_idle
srv_master_thread log flush and writes: 44691
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1813
OS WAIT ARRAY INFO: signal count 1803
RW-shared spins 1545, rounds 41412, OS waits 1287
RW-excl spins 1566, rounds 8114, OS waits 55
RW-sx spins 5, rounds 187, OS waits 4
Spin rounds per wait: 26.80 RW-shared, 5.18 RW-excl, 37.40 RW-sx
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TRANSACTIONS
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Trx id counter 27088
Purge done for trx's n:o < 27088 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284304849834200, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284304849830032, 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: [63, 64, 4, 0] ,
 ibuf aio reads:, log i/o's:, sync i/o's:
Pending flushes (fsync) log: 0; buffer pool: 0
115028 OS file reads, 50234 OS file writes, 24428 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 2 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)
0.36 hash searches/s, 0.21 non-hash searches/s
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LOG
---
Log sequence number 18584090
Log flushed up to   18584090
Pages flushed up to 18580139
Last checkpoint at  18580139
0 pending log flushes, 0 pending chkp writes
20057 log i/o's done, 0.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 112680
Buffer pool size   1003
Free buffers       755
Database pages     240
Old database pages 0
Modified db pages  145
Percent of dirty pages(LRU & free pages): 14.558
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 131, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 114980, created 697, written 28528
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 240, unzip_LRU len: 0
I/O sum[17]: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=32112, Main thread ID=32252, state: sleeping
Number of rows inserted 267, updated 11659, deleted 111, read 474302
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.36 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 22562
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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