Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-21 18:34:59 0xea4 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 35 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 86 srv_active, 0 srv_shutdown, 32513 srv_idle
srv_master_thread log flush and writes: 32599
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 5441
OS WAIT ARRAY INFO: signal count 405
RW-shared spins 489, rounds 14249, OS waits 379
RW-excl spins 33, rounds 469, OS waits 12
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.14 RW-shared, 14.21 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 1610852
Purge done for trx's n:o < 1610852 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283548073775248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283548073779416, 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
9769 OS file reads, 1653 OS file writes, 840 OS fsyncs
0.11 reads/s, 16384 avg bytes/read, 0.74 writes/s, 0.29 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 26, seg size 28, 16 merges
merged operations:
 insert 25, delete mark 36, delete 18
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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.14 hash searches/s, 1.89 non-hash searches/s
---
LOG
---
Log sequence number 2197640218
Log flushed up to   2197640182
Pages flushed up to 2197640182
Last checkpoint at  2197635262
0 pending log flushes, 0 pending chkp writes
506 log i/o's done, 0.11 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1797872
Buffer pool size   1003
Free buffers       740
Database pages     256
Old database pages 0
Modified db pages  1
Percent of dirty pages(LRU & free pages): 0.100
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 192, not young 26280
0.00 youngs/s, 0.00 non-youngs/s
Pages read 9048, created 139, written 1037
0.11 reads/s, 0.00 creates/s, 0.57 writes/s
Buffer pool hit rate 987 / 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: 256, unzip_LRU len: 0
I/O sum[24]: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=2908, Main thread ID=4720, state: sleeping
Number of rows inserted 35, updated 98, deleted 35, read 169174
0.00 inserts/s, 0.11 updates/s, 0.00 deletes/s, 0.97 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 32504
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================