Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-16 21:52:45 0x2914 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 46 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 6534 srv_active, 0 srv_shutdown, 7508 srv_idle
srv_master_thread log flush and writes: 14040
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3694
OS WAIT ARRAY INFO: signal count 3669
RW-shared spins 2126, rounds 59108, OS waits 1955
RW-excl spins 251, rounds 3091, OS waits 84
RW-sx spins 19, rounds 137, OS waits 3
Spin rounds per wait: 27.80 RW-shared, 12.31 RW-excl, 7.21 RW-sx
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TRANSACTIONS
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Trx id counter 22341
Purge done for trx's n:o < 22341 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283217401582072, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283217401577904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283217401573736, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283217401569568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283217401565400, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283217401561232, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
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
17779 OS file reads, 74234 OS file writes, 41984 OS fsyncs
2.70 reads/s, 16384 avg bytes/read, 7.24 writes/s, 3.33 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 0 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)
10.28 hash searches/s, 32.91 non-hash searches/s
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LOG
---
Log sequence number 12612692
Log flushed up to   12612672
Pages flushed up to 12599539
Last checkpoint at  12580165
0 pending log flushes, 0 pending chkp writes
21210 log i/o's done, 2.22 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 117688
Buffer pool size   1003
Free buffers       730
Database pages     267
Old database pages 0
Modified db pages  31
Percent of dirty pages(LRU & free pages): 3.106
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 17727, created 440, written 45377
2.70 reads/s, 0.24 creates/s, 4.59 writes/s
Buffer pool hit rate 975 / 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: 267, unzip_LRU len: 0
I/O sum[331]:cur[4], 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=2840, Main thread ID=10236, state: sleeping
Number of rows inserted 67, updated 10449, deleted 173, read 288281
0.00 inserts/s, 1.50 updates/s, 0.00 deletes/s, 11.41 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 14547
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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