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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 01:40:56 5eec INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 40 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6073 srv_active, 0 srv_shutdown, 112979 srv_idle
srv_master_thread log flush and writes: 119052
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 52015
OS WAIT ARRAY INFO: signal count 49814
Mutex spin waits 167862, rounds 2644012, OS waits 47134
RW-shared spins 2469, rounds 68090, OS waits 2140
RW-excl spins 6334, rounds 7327, OS waits 81
Spin rounds per wait: 15.75 mutex, 27.58 RW-shared, 1.16 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 336153293
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 1368539, OS thread handle 0x5eec, query id 9203038 localhost 127.0.0.1 root init
SHOW ENGINE INNODB STATUS
---TRANSACTION 336153292, not started
MySQL thread id 1368538, OS thread handle 0x297c, query id 9203030 localhost 127.0.0.1 root removing tmp table
SHOW FULL COLUMNS FROM `budget`.`sub_classification_setup`
---TRANSACTION 0, not started
MySQL thread id 1368534, OS thread handle 0x5eec, query id 9203036 localhost 127.0.0.1 root 
---TRANSACTION 0, not started
MySQL thread id 1368530, OS thread handle 0x297c, query id 9203028 localhost 127.0.0.1 root 
---TRANSACTION 336153291, not started
MySQL thread id 1368528, OS thread handle 0x5b08, query id 9203034 localhost 127.0.0.1 root Opening tables
SHOW  COLUMNS FROM `qpsii_lgusystem`.`tbl_official_reciept_release_details`
---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
326253 OS file reads, 5110 OS file writes, 5110 OS fsyncs
0.02 reads/s, 16384 avg bytes/read, 0.10 writes/s, 0.10 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
35.70 hash searches/s, 6.00 non-hash searches/s
---
LOG
---
Log sequence number 121473296488
Log flushed up to   121473296488
Pages flushed up to 121473296488
Last checkpoint at  121473296488
Max checkpoint age    869019772
Checkpoint age target 841862905
Modified age          0
Checkpoint age        0
0 pending log writes, 0 pending chkp writes
3377 log i/o's done, 0.05 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 5557452800; in additional pool allocated 0
Total memory allocated by read views 22734328
Internal hash tables (constant factor + variable factor)
    Adaptive hash index 97094608 	(84999016 + 12095592)
    Page hash           1329176 (buffer pool 0 only)
    Dictionary cache    33624707 	(21251248 + 12373459)
    File system         5692400 	(812272 + 4880128)
    Lock system         13284136 	(13281976 + 2160)
    Recovery system     0 	(0 + 0)
Dictionary memory allocated 12373459
Buffer pool size        327676
Buffer pool size, bytes 5368643584
Free buffers            14683
Database pages          312255
Old database pages      115344
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 312255, created 0, written 869
0.02 reads/s, 0.00 creates/s, 0.02 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: 312255, 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            3706
Database pages          78028
Old database pages      28823
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 78028, created 0, written 869
0.00 reads/s, 0.00 creates/s, 0.02 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: 78028, 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            3128
Database pages          78606
Old database pages      29036
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 78606, 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: 78606, 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            3402
Database pages          78334
Old database pages      28936
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 78334, 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: 78334, 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            4447
Database pages          77287
Old database pages      28549
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 77287, created 0, written 0
0.02 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: 77287, 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 2718758753
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 33417.19 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 14
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================