Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-13 18:32:06 0x69d8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 14525 srv_active, 0 srv_shutdown, 1202730 srv_idle
srv_master_thread log flush and writes: 1217255
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 122269
OS WAIT ARRAY INFO: signal count 279636
RW-shared spins 1254804, rounds 13223576, OS waits 92958
RW-excl spins 444487, rounds 1362842, OS waits 9781
RW-sx spins 375, rounds 5026, OS waits 115
Spin rounds per wait: 10.54 RW-shared, 3.07 RW-excl, 13.40 RW-sx
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TRANSACTIONS
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Trx id counter 133202
Purge done for trx's n:o < 133202 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283640621428952, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283640621424784, 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
4074274 OS file reads, 228475 OS file writes, 124672 OS fsyncs
0.92 reads/s, 16384 avg bytes/read, 2.41 writes/s, 1.84 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, 108 merges
merged operations:
 insert 3911, 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 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)
3.97 hash searches/s, 8.76 non-hash searches/s
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LOG
---
Log sequence number 2877434590
Log flushed up to   2877434590
Pages flushed up to 2877433524
Last checkpoint at  2877433481
0 pending log flushes, 0 pending chkp writes
68738 log i/o's done, 1.14 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 162760
Buffer pool size   1003
Free buffers       740
Database pages     256
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.301
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 695746, not young 180802589
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4074224, created 30030, written 139163
0.92 reads/s, 0.00 creates/s, 1.03 writes/s
Buffer pool hit rate 976 / 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[75]: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=4900, Main thread ID=7396, state: sleeping
Number of rows inserted 4071478, updated 11963, deleted 3134, read 490328836
0.00 inserts/s, 0.30 updates/s, 0.00 deletes/s, 77.62 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 0
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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