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Storage engines

InnoDB Documentation

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

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2026-10-20 01:08:27 0x4888 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 36 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1755274 srv_active, 0 srv_shutdown, 36464 srv_idle
srv_master_thread log flush and writes: 1791717
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 431427759
OS WAIT ARRAY INFO: signal count 555748920
RW-shared spins 741522782, rounds 11398208415, OS waits 220815169
RW-excl spins 641658611, rounds 8810072880, OS waits 157922216
RW-sx spins 35082172, rounds 351445327, OS waits 5353502
Spin rounds per wait: 15.37 RW-shared, 13.73 RW-excl, 10.02 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 2600469313
Purge done for trx's n:o < 2587812750 undo n:o < 0 state: running but idle
History list length 6215664
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282891049365792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282891049361624, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282891049369960, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282891049357456, ACTIVE 58290 sec
0 lock struct(s), heap size 1128, 0 row lock(s)
MySQL thread id 5185071, OS thread handle 18496, query id 1821885686 localhost 127.0.0.1 root 
Trx read view will not see trx with id >= 2587812746, sees < 2587812740
--------
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
2133170699 OS file reads, 2308977025 OS file writes, 286125437 OS fsyncs
188.41 reads/s, 16384 avg bytes/read, 396.49 writes/s, 56.64 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 3435, free list len 36777, seg size 40213, 190803455 merges
merged operations:
 insert 552611512, delete mark 986660090, delete 8572524
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 553253, node heap has 1281 buffer(s)
Hash table size 553253, node heap has 314 buffer(s)
Hash table size 553253, node heap has 29 buffer(s)
Hash table size 553253, node heap has 6 buffer(s)
Hash table size 553253, node heap has 8 buffer(s)
Hash table size 553253, node heap has 4 buffer(s)
Hash table size 553253, node heap has 22 buffer(s)
Hash table size 553253, node heap has 6 buffer(s)
1646.62 hash searches/s, 4796.03 non-hash searches/s
---
LOG
---
Log sequence number 4797121395238
Log flushed up to   4797121395238
Pages flushed up to 4797120620397
Last checkpoint at  4797119870795
0 pending log flushes, 0 pending chkp writes
153921669 log i/o's done, 6.44 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 2281701376
Dictionary memory allocated 262920
Buffer pool size   128432
Free buffers       8192
Database pages     118570
Old database pages 43604
Modified db pages  1559
Percent of dirty pages(LRU & free pages): 1.230
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1299319988, not young 96282743911
914.86 youngs/s, 1511.62 non-youngs/s
Pages read 2133170591, created 22629714, written 2095987089
188.41 reads/s, 4.69 creates/s, 369.99 writes/s
Buffer pool hit rate 995 / 1000, young-making rate 21 / 1000 not 36 / 1000
Pages read ahead 2.25/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 118570, unzip_LRU len: 0
I/O sum[457896]:cur[2664], unzip sum[0]:cur[0]
----------------------
INDIVIDUAL BUFFER POOL INFO
----------------------
---BUFFER POOL 0
Buffer pool size   16054
Free buffers       1024
Database pages     14845
Old database pages 5459
Modified db pages  58
Percent of dirty pages(LRU & free pages): 0.365
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 178561100, not young 12452731256
70.11 youngs/s, 21.69 non-youngs/s
Pages read 260620184, created 2877461, written 260624287
2.25 reads/s, 0.61 creates/s, 40.50 writes/s
Buffer pool hit rate 999 / 1000, young-making rate 17 / 1000 not 5 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14845, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size   16054
Free buffers       1024
Database pages     14836
Old database pages 5456
Modified db pages  171
Percent of dirty pages(LRU & free pages): 1.078
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 129943207, not young 11627374001
88.44 youngs/s, 26.47 non-youngs/s
Pages read 252178705, created 2839738, written 251716596
2.56 reads/s, 0.00 creates/s, 44.17 writes/s
Buffer pool hit rate 999 / 1000, young-making rate 22 / 1000 not 6 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14836, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size   16054
Free buffers       1024
Database pages     14830
Old database pages 5454
Modified db pages  200
Percent of dirty pages(LRU & free pages): 1.261
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 216403793, not young 12940119295
149.75 youngs/s, 501.57 non-youngs/s
Pages read 293319297, created 2787051, written 276664107
66.58 reads/s, 0.61 creates/s, 46.25 writes/s
Buffer pool hit rate 993 / 1000, young-making rate 14 / 1000 not 48 / 1000
Pages read ahead 0.92/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14830, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size   16054
Free buffers       1024
Database pages     14791
Old database pages 5439
Modified db pages  124
Percent of dirty pages(LRU & free pages): 0.784
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 149010350, not young 11692134561
126.39 youngs/s, 153.05 non-youngs/s
Pages read 267827970, created 2811813, written 263659540
14.14 reads/s, 0.11 creates/s, 39.61 writes/s
Buffer pool hit rate 996 / 1000, young-making rate 30 / 1000 not 37 / 1000
Pages read ahead 0.67/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14791, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 4
Buffer pool size   16054
Free buffers       1024
Database pages     14836
Old database pages 5456
Modified db pages  275
Percent of dirty pages(LRU & free pages): 1.734
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 144026568, not young 11593495668
125.50 youngs/s, 112.80 non-youngs/s
Pages read 257964835, created 2832613, written 275153619
10.19 reads/s, 0.72 creates/s, 53.39 writes/s
Buffer pool hit rate 998 / 1000, young-making rate 24 / 1000 not 21 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14836, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 5
Buffer pool size   16054
Free buffers       1024
Database pages     14793
Old database pages 5440
Modified db pages  299
Percent of dirty pages(LRU & free pages): 1.890
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 199562865, not young 12759486531
149.86 youngs/s, 597.18 non-youngs/s
Pages read 292303111, created 2830259, written 263725014
82.30 reads/s, 1.81 creates/s, 54.39 writes/s
Buffer pool hit rate 983 / 1000, young-making rate 30 / 1000 not 122 / 1000
Pages read ahead 0.67/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14793, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 6
Buffer pool size   16054
Free buffers       1024
Database pages     14835
Old database pages 5456
Modified db pages  155
Percent of dirty pages(LRU & free pages): 0.977
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 139085239, not young 11403952971
91.25 youngs/s, 23.36 non-youngs/s
Pages read 245844269, created 2816210, written 251153557
2.33 reads/s, 0.50 creates/s, 43.17 writes/s
Buffer pool hit rate 999 / 1000, young-making rate 17 / 1000 not 4 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14835, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
---BUFFER POOL 7
Buffer pool size   16054
Free buffers       1024
Database pages     14804
Old database pages 5444
Modified db pages  277
Percent of dirty pages(LRU & free pages): 1.750
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 142726866, not young 11813449628
113.58 youngs/s, 75.50 non-youngs/s
Pages read 263112220, created 2834569, written 253290369
8.06 reads/s, 0.33 creates/s, 48.53 writes/s
Buffer pool hit rate 998 / 1000, young-making rate 26 / 1000 not 17 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 14804, unzip_LRU len: 0
I/O sum[57237]:cur[333], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Process ID=4344, Main thread ID=5928, state: sleeping
Number of rows inserted 409786533, updated 314058614, deleted 408773622, read 235337013345
0.28 inserts/s, 90.55 updates/s, 0.00 deletes/s, 142582.84 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 345487
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================