Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-29 22:19:59 0x28c4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 25 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 203 srv_active, 0 srv_shutdown, 31995 srv_idle
srv_master_thread log flush and writes: 32198
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 272
OS WAIT ARRAY INFO: signal count 209
RW-shared spins 103, rounds 2991, OS waits 99
RW-excl spins 4, rounds 120, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.04 RW-shared, 30.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 2691
Purge done for trx's n:o < 2691 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283717312209184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283717312205016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283717312200848, 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
2215 OS file reads, 5326 OS file writes, 2307 OS fsyncs
0 pending reads, 1 pending writes
3.84 reads/s, 16384 avg bytes/read, 8.40 writes/s, 3.72 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 0 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 0 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)
13.68 hash searches/s, 28.52 non-hash searches/s
---
LOG
---
Log sequence number 1866404
Log flushed up to   1866404
Pages flushed up to 1853089
Last checkpoint at  1828665
0 pending log flushes, 0 pending chkp writes
1644 log i/o's done, 3.00 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 82632
Buffer pool size   1003
Free buffers       745
Database pages     256
Old database pages 0
Modified db pages  23
Percent of dirty pages(LRU & free pages): 2.295
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 23, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2178, created 196, written 3402
2.56 reads/s, 0.00 creates/s, 7.62 writes/s
Buffer pool hit rate 978 / 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[217]:cur[28], 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=1504, Main thread ID=25648, state: sleeping
Number of rows inserted 1, updated 1233, deleted 0, read 7337
0.00 inserts/s, 2.40 updates/s, 0.00 deletes/s, 12.36 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 742
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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