Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-02-22 09:31:41 0xb95c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 12 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 12475 srv_active, 0 srv_shutdown, 2273120 srv_idle
srv_master_thread log flush and writes: 2285595
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 185994
OS WAIT ARRAY INFO: signal count 65423
RW-shared spins 9212, rounds 274416, OS waits 8817
RW-excl spins 82, rounds 993, OS waits 26
RW-sx spins 9, rounds 48, OS waits 0
Spin rounds per wait: 29.79 RW-shared, 12.11 RW-excl, 5.33 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 32913
Purge done for trx's n:o < 32913 undo n:o < 0 state: running but idle
History list length 5
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284460842328280, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284460842324112, 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
24895 OS file reads, 136731 OS file writes, 86154 OS fsyncs
1.08 reads/s, 16384 avg bytes/read, 4.17 writes/s, 2.25 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
8.42 hash searches/s, 15.92 non-hash searches/s
---
LOG
---
Log sequence number 21022444
Log flushed up to   21022424
Pages flushed up to 21020062
Last checkpoint at  21013746
0 pending log flushes, 0 pending chkp writes
47209 log i/o's done, 1.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       741
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
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 24859, created 896, written 75990
1.08 reads/s, 0.00 creates/s, 2.42 writes/s
Buffer pool hit rate 980 / 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[37]:cur[5], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=9664, Main thread ID=7340, state: sleeping
Number of rows inserted 64, updated 16147, deleted 0, read 254066
0.00 inserts/s, 0.92 updates/s, 0.00 deletes/s, 7.42 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 15199
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================