Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-28 13:38:53 0xf9c8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 48 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 443 srv_active, 0 srv_shutdown, 11104 srv_idle
srv_master_thread log flush and writes: 11547
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 14497
OS WAIT ARRAY INFO: signal count 1341
RW-shared spins 495, rounds 14755, OS waits 486
RW-excl spins 42, rounds 358, OS waits 7
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.81 RW-shared, 8.52 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 559612
Purge done for trx's n:o < 559612 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283799627706584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283799627702416, 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
4850 OS file reads, 9791 OS file writes, 4630 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 7.21 writes/s, 3.19 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 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 0 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
Hash table size 138401, node heap has 1 buffer(s)
11.29 hash searches/s, 28.48 non-hash searches/s
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LOG
---
Log sequence number 5069530708
Log flushed up to   5069529670
Pages flushed up to 5069513018
Last checkpoint at  5069512419
0 pending log flushes, 0 pending chkp writes
3201 log i/o's done, 2.42 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 553648128
Dictionary memory allocated 270432
Buffer pool size   32108
Free buffers       27231
Database pages     4870
Old database pages 1817
Modified db pages  46
Percent of dirty pages(LRU & free pages): 0.143
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 4739, created 131, written 6045
0.00 reads/s, 0.00 creates/s, 4.52 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: 4870, unzip_LRU len: 0
I/O sum[0]:cur[1], 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=3528, Main thread ID=7004, state: sleeping
Number of rows inserted 0, updated 1786, deleted 0, read 66286
0.00 inserts/s, 1.71 updates/s, 0.00 deletes/s, 11.58 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4532
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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