Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-13 03:07:41 0x23a8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 55 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 11477 srv_active, 0 srv_shutdown, 186073 srv_idle
srv_master_thread log flush and writes: 197550
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 14983
OS WAIT ARRAY INFO: signal count 14894
RW-shared spins 12082, rounds 352742, OS waits 11697
RW-excl spins 1442, rounds 12540, OS waits 85
RW-sx spins 34, rounds 1168, OS waits 37
Spin rounds per wait: 29.20 RW-shared, 8.70 RW-excl, 34.35 RW-sx
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TRANSACTIONS
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Trx id counter 98361
Purge done for trx's n:o < 98361 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283610223903008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283610223898840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283610223894672, 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
540369 OS file reads, 149817 OS file writes, 91850 OS fsyncs
2.56 reads/s, 16384 avg bytes/read, 10.02 writes/s, 5.22 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 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)
7.00 hash searches/s, 17.64 non-hash searches/s
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LOG
---
Log sequence number 104135042
Log flushed up to   104135042
Pages flushed up to 104132372
Last checkpoint at  104119063
0 pending log flushes, 0 pending chkp writes
52476 log i/o's done, 2.80 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 192808
Buffer pool size   1003
Free buffers       738
Database pages     257
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.502
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 43813, not young 4039858
0.00 youngs/s, 0.00 non-youngs/s
Pages read 540288, created 843, written 83058
2.56 reads/s, 0.04 creates/s, 6.29 writes/s
Buffer pool hit rate 972 / 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: 257, unzip_LRU len: 0
I/O sum[457]: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=1984, Main thread ID=1856, state: sleeping
Number of rows inserted 303, updated 18086, deleted 214, read 45560897
0.00 inserts/s, 1.45 updates/s, 0.00 deletes/s, 41.33 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 46308
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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