Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
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2026-08-04 04:55:43 0x4320 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 31 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 0 srv_active, 0 srv_shutdown, 186504 srv_idle
srv_master_thread log flush and writes: 186504
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 793
OS WAIT ARRAY INFO: signal count 779
RW-shared spins 677, rounds 18147, OS waits 601
RW-excl spins 35, rounds 340, OS waits 9
RW-sx spins 1, rounds 4, OS waits 0
Spin rounds per wait: 26.81 RW-shared, 9.71 RW-excl, 4.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 6032
Purge done for trx's n:o < 6032 undo n:o < 0 state: running
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283640358076848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283640358072632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283640358068416, 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
331 OS file reads, 16227 OS file writes, 6318 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 7.10 writes/s, 3.10 fsyncs/s
-------------------------------------
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 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)
4.61 hash searches/s, 15.97 non-hash searches/s
---
LOG
---
Log sequence number 4155028
Log flushed up to 4155008
Pages flushed up to 4150249
Last checkpoint at 4150206
0 pending log flushes, 0 pending chkp writes
4677 log i/o's done, 2.13 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 82432
Buffer pool size 1003
Free buffers 499
Database pages 501
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 295, created 206, written 11004
0.00 reads/s, 0.00 creates/s, 4.65 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: 501, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=7176, Main thread ID=14820, state: sleeping
Number of rows inserted 1, updated 2918, deleted 0, read 8455
0.00 inserts/s, 1.23 updates/s, 0.00 deletes/s, 4.03 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1682
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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