Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-18 21:42:55 0x105c4 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 13 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 197815 srv_active, 0 srv_shutdown, 733746 srv_idle
srv_master_thread log flush and writes: 931544
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3640165
OS WAIT ARRAY INFO: signal count 2039658
RW-shared spins 1970737, rounds 60970236, OS waits 1883164
RW-excl spins 664006, rounds 19450085, OS waits 592099
RW-sx spins 3886, rounds 29478, OS waits 452
Spin rounds per wait: 30.94 RW-shared, 29.29 RW-excl, 7.59 RW-sx
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TRANSACTIONS
------------
Trx id counter 5943303
Purge done for trx's n:o < 5943303 undo n:o < 0 state: running but idle
History list length 62
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283577137013744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137009576, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137005408, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137001240, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136997072, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136992904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136988736, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136984568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136976232, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136972064, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136967896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136963728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136980400, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
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
3381162 OS file reads, 13234091 OS file writes, 3153570 OS fsyncs
6.85 reads/s, 16384 avg bytes/read, 28.84 writes/s, 7.38 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 3, seg size 5, 4979 merges
merged operations:
 insert 7091, delete mark 3437, delete 1091
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)
16.92 hash searches/s, 8.77 non-hash searches/s
---
LOG
---
Log sequence number 1306483394
Log flushed up to   1306483394
Pages flushed up to 1306471634
Last checkpoint at  1306470242
0 pending log flushes, 0 pending chkp writes
2238493 log i/o's done, 5.46 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1066704
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  70
Percent of dirty pages(LRU & free pages): 7.028
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 4784, not young 1283640
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3381117, created 62255, written 10553093
6.85 reads/s, 0.00 creates/s, 22.46 writes/s
Buffer pool hit rate 953 / 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: 258, unzip_LRU len: 0
I/O sum[1759]:cur[22], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3892, Main thread ID=2380, state: sleeping
Number of rows inserted 200733, updated 2968817, deleted 15902, read 164262457
0.00 inserts/s, 8.85 updates/s, 0.00 deletes/s, 14.23 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 487101
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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