Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[
Variables
|
Buffer Pool
|
InnoDB Status
]
=====================================
2026-03-10 17:06:18 0x8cdc INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 13 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 11452 srv_active, 0 srv_shutdown, 8009 srv_idle
srv_master_thread log flush and writes: 19461
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 440615
OS WAIT ARRAY INFO: signal count 97775
RW-shared spins 7272, rounds 214822, OS waits 6980
RW-excl spins 947, rounds 5874, OS waits 88
RW-sx spins 3, rounds 60, OS waits 1
Spin rounds per wait: 29.54 RW-shared, 6.20 RW-excl, 20.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 875496
Purge done for trx's n:o < 875496 undo n:o < 0 state: running but idle
History list length 12
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283859989414248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989405912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989401744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283859989410080, 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
86257 OS file reads, 162718 OS file writes, 91123 OS fsyncs
10.31 reads/s, 16384 avg bytes/read, 21.46 writes/s, 11.46 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 3, seg size 5, 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 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)
20.61 hash searches/s, 65.76 non-hash searches/s
---
LOG
---
Log sequence number 113036673
Log flushed up to 113036653
Pages flushed up to 112996767
Last checkpoint at 112994024
0 pending log flushes, 0 pending chkp writes
49170 log i/o's done, 6.46 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 4306880
Buffer pool size 1003
Free buffers 742
Database pages 254
Old database pages 0
Modified db pages 64
Percent of dirty pages(LRU & free pages): 6.419
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 290, not young 37894
0.00 youngs/s, 0.00 non-youngs/s
Pages read 84533, created 1431, written 98578
10.31 reads/s, 0.46 creates/s, 12.85 writes/s
Buffer pool hit rate 963 / 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: 254, unzip_LRU len: 0
I/O sum[891]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=56288, Main thread ID=47692, state: sleeping
Number of rows inserted 902, updated 21782, deleted 902, read 1686328
0.08 inserts/s, 4.85 updates/s, 0.08 deletes/s, 169.29 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 303943
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
