Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-13 20:58:16 0x1e98 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 7 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 7044 srv_active, 0 srv_shutdown, 2139030 srv_idle
srv_master_thread log flush and writes: 2146074
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 256203
OS WAIT ARRAY INFO: signal count 56875
RW-shared spins 3075, rounds 90778, OS waits 2945
RW-excl spins 109, rounds 3607, OS waits 102
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.52 RW-shared, 33.09 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 21757
Purge done for trx's n:o < 21757 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283848934736160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934731992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934727824, 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
16125 OS file reads, 79986 OS file writes, 46171 OS fsyncs
1.57 reads/s, 16384 avg bytes/read, 2.00 writes/s, 1.71 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.00 hash searches/s, 9.28 non-hash searches/s
---
LOG
---
Log sequence number 11909217
Log flushed up to   11909197
Pages flushed up to 11904018
Last checkpoint at  11902716
0 pending log flushes, 0 pending chkp writes
23953 log i/o's done, 1.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       743
Database pages     257
Old database pages 0
Modified db pages  31
Percent of dirty pages(LRU & free pages): 3.097
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 16090, created 440, written 48146
1.57 reads/s, 0.00 creates/s, 0.71 writes/s
Buffer pool hit rate 968 / 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: 257, unzip_LRU len: 0
I/O sum[160]: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=1908, Main thread ID=3624, state: sleeping
Number of rows inserted 56, updated 10599, deleted 0, read 222342
0.00 inserts/s, 0.71 updates/s, 0.00 deletes/s, 4.86 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 22802
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================