Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-07 10:17:23 0x1f24 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 31 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 107 srv_active, 0 srv_shutdown, 1702596 srv_idle
srv_master_thread log flush and writes: 1702703
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 247
OS WAIT ARRAY INFO: signal count 168
RW-shared spins 164, rounds 2207, OS waits 66
RW-excl spins 42, rounds 222, OS waits 3
RW-sx spins 1, rounds 4, OS waits 0
Spin rounds per wait: 13.46 RW-shared, 5.29 RW-excl, 4.00 RW-sx
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TRANSACTIONS
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Trx id counter 1241
Purge done for trx's n:o < 1241 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283586502594952, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283586502590776, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283586502582424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283586502586600, 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
1099 OS file reads, 2916 OS file writes, 1060 OS fsyncs
1.81 reads/s, 16384 avg bytes/read, 3.71 writes/s, 1.29 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 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)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
3.03 hash searches/s, 13.00 non-hash searches/s
---
LOG
---
Log sequence number 986071
Log flushed up to   986051
Pages flushed up to 981401
Last checkpoint at  946277
0 pending log flushes, 0 pending chkp writes
771 log i/o's done, 1.13 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       734
Database pages     266
Old database pages 0
Modified db pages  9
Percent of dirty pages(LRU & free pages): 0.899
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 1063, created 196, written 2040
20.99 reads/s, 0.00 creates/s, 36.48 writes/s
Buffer pool hit rate 951 / 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: 266, unzip_LRU len: 0
I/O sum[216]:cur[88], 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=452, Main thread ID=5864, state: sleeping
Number of rows inserted 1, updated 524, deleted 0, read 1694
0.00 inserts/s, 1.03 updates/s, 0.00 deletes/s, 2.97 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 551
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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