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Storage engines

InnoDB Documentation

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

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2026-06-16 13:27:49 6d64 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 28 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 17003 srv_active, 0 srv_shutdown, 1087686 srv_idle
srv_master_thread log flush and writes: 1104679
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 79262
OS WAIT ARRAY INFO: signal count 74466
Mutex spin waits 289219, rounds 2662003, OS waits 55870
RW-shared spins 21728, rounds 646336, OS waits 21365
RW-excl spins 6442, rounds 13899, OS waits 303
Spin rounds per wait: 9.20 mutex, 29.75 RW-shared, 2.16 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 200962100
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 11735201, OS thread handle 0x6d64, query id 122537158 localhost 127.0.0.1 root init
SHOW ENGINE INNODB STATUS
---TRANSACTION 200962099, not started
MySQL thread id 11735198, OS thread handle 0x6d64, query id 122537153 localhost 127.0.0.1 root 
---TRANSACTION 190346499, not started
MySQL thread id 1, OS thread handle 0x12c4, 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
357806 OS file reads, 86415 OS file writes, 86409 OS fsyncs
0.04 reads/s, 16384 avg bytes/read, 0.04 writes/s, 0.04 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
16.64 hash searches/s, 8.75 non-hash searches/s
---
LOG
---
Log sequence number 121467842490
Log flushed up to   121467842490
Pages flushed up to 121467842480
Last checkpoint at  121467842480
Max checkpoint age    869019772
Checkpoint age target 841862905
Modified age          10
Checkpoint age        10
0 pending log writes, 0 pending chkp writes
45563 log i/o's done, 0.04 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 5557452800; in additional pool allocated 0
Total memory allocated by read views 88858704
Internal hash tables (constant factor + variable factor)
    Adaptive hash index 102058960 	(84999016 + 17059944)
    Page hash           1329176 (buffer pool 0 only)
    Dictionary cache    32853438 	(21251248 + 11602190)
    File system         5692400 	(812272 + 4880128)
    Lock system         13283056 	(13281976 + 1080)
    Recovery system     0 	(0 + 0)
Dictionary memory allocated 11602190
Buffer pool size        327676
Buffer pool size, bytes 5368643584
Free buffers            4096
Database pages          322539
Old database pages      118980
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 155417, not young 395460
0.00 youngs/s, 0.07 non-youngs/s
Pages read 343808, created 0, written 20430
0.04 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 999 / 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: 322539, unzip_LRU len: 0
I/O sum[8]: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            1024
Database pages          80635
Old database pages      29745
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 39183, not young 134734
0.00 youngs/s, 0.00 non-youngs/s
Pages read 88016, created 0, written 20429
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: 80635, unzip_LRU len: 0
I/O sum[2]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            1024
Database pages          80635
Old database pages      29745
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 39171, not young 79943
0.00 youngs/s, 0.00 non-youngs/s
Pages read 87534, 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: 80635, unzip_LRU len: 0
I/O sum[2]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            1024
Database pages          80634
Old database pages      29745
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 39260, not young 62481
0.00 youngs/s, 0.07 non-youngs/s
Pages read 84400, created 0, written 0
0.04 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 999 / 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: 80634, unzip_LRU len: 0
I/O sum[2]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size        81919
Buffer pool size, bytes 1342160896
Free buffers            1024
Database pages          80635
Old database pages      29745
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 37803, not young 118302
0.00 youngs/s, 0.00 non-youngs/s
Pages read 83858, created 0, written 1
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: 80635, unzip_LRU len: 0
I/O sum[2]: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 9196, state: sleeping
Number of rows inserted 2, updated 0, deleted 0, read 3172438727
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2179.99 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 74
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================