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Storage engines

InnoDB Documentation

Percona-XtraDB, Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2026-08-18 00:50:25 2150 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 7 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 5063 srv_active, 0 srv_shutdown, 110983 srv_idle
srv_master_thread log flush and writes: 116046
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 23908
OS WAIT ARRAY INFO: signal count 23157
Mutex spin waits 83923, rounds 1127016, OS waits 21093
RW-shared spins 1801, rounds 50638, OS waits 1611
RW-excl spins 4344, rounds 4546, OS waits 49
Spin rounds per wait: 13.43 mutex, 28.12 RW-shared, 1.05 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 335889931
Purge done for trx's n:o < 189445454 undo n:o < 0 state: running but idle
History list length 1494
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 1295202, OS thread handle 0x2150, query id 8646970 localhost 127.0.0.1 root init
SHOW ENGINE INNODB STATUS
---TRANSACTION 335889929, not started
MySQL thread id 1295195, OS thread handle 0x3ee4, query id 8646921 localhost 127.0.0.1 root 
---TRANSACTION 334589955, not started
MySQL thread id 1, OS thread handle 0x25bc, query id 0 Reading from net
--------
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 (read thread)
I/O thread 7 state: native aio handle (read thread)
I/O thread 8 state: native aio handle (read thread)
I/O thread 9 state: native aio handle (read thread)
I/O thread 10 state: native aio handle (write thread)
I/O thread 11 state: native aio handle (write thread)
I/O thread 12 state: native aio handle (write thread)
I/O thread 13 state: native aio handle (write thread)
I/O thread 14 state: native aio handle (write thread)
I/O thread 15 state: native aio handle (write thread)
I/O thread 16 state: native aio handle (write thread)
I/O thread 17 state: native aio handle (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0, 0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0, 0, 0, 0, 0] ,
 ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
260570 OS file reads, 4625 OS file writes, 4625 OS fsyncs
0.86 reads/s, 16384 avg bytes/read, 0.14 writes/s, 0.14 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
2.71 hash searches/s, 2.29 non-hash searches/s
---
LOG
---
Log sequence number 121473285872
Log flushed up to   121473285872
Pages flushed up to 121473285862
Last checkpoint at  121473285862
Max checkpoint age    869019772
Checkpoint age target 841862905
Modified age          10
Checkpoint age        10
0 pending log writes, 0 pending chkp writes
2996 log i/o's done, 0.14 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 5557452800; in additional pool allocated 0
Total memory allocated by read views 18174928
Internal hash tables (constant factor + variable factor)
    Adaptive hash index 96373712 	(84999016 + 11374696)
    Page hash           1329176 (buffer pool 0 only)
    Dictionary cache    33744935 	(21251248 + 12493687)
    File system         5692400 	(812272 + 4880128)
    Lock system         13283056 	(13281976 + 1080)
    Recovery system     0 	(0 + 0)
Dictionary memory allocated 12493687
Buffer pool size        327676
Buffer pool size, bytes 5368643584
Free buffers            80410
Database pages          246572
Old database pages      91098
Modified db pages       1
Percent of dirty pages(LRU & free pages): 0.000
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 246572, created 0, written 817
0.86 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 997 / 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: 246572, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
----------------------
INDIVIDUAL BUFFER POOL INFO
----------------------
---BUFFER POOL 0
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            20087
Database pages          61659
Old database pages      22780
Modified db pages       1
Percent of dirty pages(LRU & free pages): 0.001
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 61659, created 0, written 817
0.00 reads/s, 0.00 creates/s, 0.00 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: 61659, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            20034
Database pages          61711
Old database pages      22800
Modified db pages       0
Percent of dirty pages(LRU & free pages): 0.000
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 61711, created 0, written 0
0.00 reads/s, 0.00 creates/s, 0.00 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: 61711, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            19555
Database pages          62192
Old database pages      22977
Modified db pages       0
Percent of dirty pages(LRU & free pages): 0.000
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 62192, created 0, written 0
0.86 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 986 / 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: 62192, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            20734
Database pages          61010
Old database pages      22541
Modified db pages       0
Percent of dirty pages(LRU & free pages): 0.000
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 61010, created 0, written 0
0.00 reads/s, 0.00 creates/s, 0.00 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: 61010, 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
0 RW transactions active inside InnoDB
0 RO transactions active inside InnoDB
0 out of 1000 descriptors used
Main thread id 9632, state: sleeping
Number of rows inserted 0, updated 0, deleted 0, read 2368153441
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 776.17 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 5
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================