数据库连接中的随机峰值 - Amazon RDS
Arj*_*ath 5 mysql amazon-ec2 amazon-rds
我正在运行带有 RDS 实例 (db.t2.small) 的 EC2 实例 (c3.large)。我经常突然遇到数据库连接峰值的问题。
问题：
正如您所看到的，我突然获得了大量的数据库连接，在某些情况下它会迅速下降，而在其他一些情况下它会停留很长时间，直到由于负载不佳而被迫重新启动实例。在此期间，我们只有 100 名用户在线，而在发生这种情况时，只有 30 名用户在线。
分析
CPU 使用率
数据库连接
可用内存(MB)
我的RDS配置：
MySQL 5.6.23
数据库
它只能通过相同的 EC2 实例安全组访问。
自定义参数组
innodb 状态
mysql> show engine innodb status\G;
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2015-11-12 05:25:53 2ab74f60f700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 256075 srv_active, 0 srv_shutdown, 560851 srv_idle
srv_master_thread log flush and writes: 816909
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 230298
OS WAIT ARRAY INFO: signal count 244122
Mutex spin waits 6207201, rounds 3485621, OS waits 12601
RW-shared spins 209626, rounds 6203909, OS waits 205881
RW-excl spins 864, rounds 382601, OS waits 11483
Spin rounds per wait: 0.56 mutex, 29.60 RW-shared, 442.83 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 340745127
Purge done for trx's n:o < 340745126 undo n:o < 0 state: running but idle
History list length 1540
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 766548, OS thread handle 0x2ab74f60f700, query id 176166621 172.31.27.148 mdsadmin init
show engine innodb status
---TRANSACTION 340745124, not started
MySQL thread id 766549, OS thread handle 0x2ab828491700, query id 176166614 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745122, not started
MySQL thread id 766547, OS thread handle 0x2ab812284700, query id 176166609 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340744952, not started
MySQL thread id 766543, OS thread handle 0x2ab821f2b700, query id 176166418 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340744934, not started
MySQL thread id 766540, OS thread handle 0x2ab828eb9700, query id 176166404 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745126, not started
MySQL thread id 766539, OS thread handle 0x2ab769b03700, query id 176166619 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340743783, not started
MySQL thread id 766538, OS thread handle 0x2ab82903f700, query id 176165235 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745119, not started
MySQL thread id 766532, OS thread handle 0x2ab8216ca700, query id 176166598 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740112, not started
MySQL thread id 766528, OS thread handle 0x2ab828513700, query id 176161502 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745120, not started
MySQL thread id 766527, OS thread handle 0x2ab8289a5700, query id 176166602 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740062, not started
MySQL thread id 766524, OS thread handle 0x2ab821b1b700, query id 176161443 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740041, not started
MySQL thread id 766523, OS thread handle 0x2ab821995700, query id 176161408 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745090, not started
MySQL thread id 766519, OS thread handle 0x2ab821e27700, query id 176166561 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740117, not started
MySQL thread id 766517, OS thread handle 0x2ab821da5700, query id 176161523 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340745121, not started
MySQL thread id 766516, OS thread handle 0x2ab8214c2700, query id 176166606 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340743490, not started
MySQL thread id 766512, OS thread handle 0x2ab8219d6700, query id 176164938 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340739502, not started
MySQL thread id 766510, OS thread handle 0x2ab821d23700, query id 176160839 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740215, not started
MySQL thread id 766506, OS thread handle 0x2ab828f3b700, query id 176161627 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340737146, not started
MySQL thread id 766493, OS thread handle 0x2ab82237c700, query id 176158370 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340737337, not started
MySQL thread id 766486, OS thread handle 0x2ab82830b700, query id 176158582 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340738073, not started
MySQL thread id 766475, OS thread handle 0x2ab8123c9700, query id 176159368 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340740319, not started
MySQL thread id 766461, OS thread handle 0x2ab7afb03700, query id 176161743 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340743475, not started
MySQL thread id 766458, OS thread handle 0x2ab828923700, query id 176164923 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340738076, not started
MySQL thread id 766409, OS thread handle 0x2ab82170b700, query id 176159377 172.31.27.148 mds1098 cleaning up
---TRANSACTION 340744895, not started
MySQL thread id 206596, OS thread handle 0x2ab818376700, query id 176166356 localhost 127.0.0.1 rdsadmin cleaning up
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 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
36921 OS file reads, 4759085 OS file writes, 3053446 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 4.32 writes/s, 3.16 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 34 merges
merged operations:
insert 35, delete mark 1, delete 1
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 5843809, node heap has 993 buffer(s)
2274.33 hash searches/s, 324.28 non-hash searches/s
---
LOG
---
Log sequence number 7531796117
Log flushed up to 7531796117
Pages flushed up to 7531796117
Last checkpoint at 7531794683
0 pending log writes, 0 pending chkp writes
1410073 log i/o's done, 1.29 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 3021996032; in additional pool allocated 0
Dictionary memory allocated 364618
Buffer pool size 180224
Free buffers 135275
Database pages 43956
Old database pages 16063
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 44, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 36826, created 7130, written 2651853
0.00 reads/s, 0.03 creates/s, 2.29 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: 43956, 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 22528
Free buffers 16902
Database pages 5491
Old database pages 2006
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 18, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4561, created 930, written 759590
0.00 reads/s, 0.00 creates/s, 0.53 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: 5491, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size 22528
Free buffers 17081
Database pages 5326
Old database pages 1946
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 7, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4603, created 723, written 214351
0.00 reads/s, 0.03 creates/s, 0.37 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: 5326, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size 22528
Free buffers 16949
Database pages 5457
Old database pages 1994
Modified db pages 0
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 4491, created 966, written 66006
0.00 reads/s, 0.00 creates/s, 0.03 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: 5457, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size 22528
Free buffers 17182
Database pages 5220
Old database pages 1907
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 14, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4423, created 797, written 353457
0.00 reads/s, 0.00 creates/s, 0.08 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: 5220, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 4
Buffer pool size 22528
Free buffers 16696
Database pages 5703
Old database pages 2085
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4812, created 891, written 358885
0.00 reads/s, 0.00 creates/s, 0.53 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: 5703, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 5
Buffer pool size 22528
Free buffers 16827
Database pages 5582
Old database pages 2040
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4669, created 913, written 359338
0.00 reads/s, 0.00 creates/s, 0.21 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: 5582, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 6
Buffer pool size 22528
Free buffers 16890
Database pages 5516
Old database pages 2016
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4522, created 994, written 353374
0.00 reads/s, 0.00 creates/s, 0.32 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: 5516, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 7
Buffer pool size 22528
Free buffers 16748
Database pages 5661
Old database pages 2069
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4745, created 916, written 186852
0.00 reads/s, 0.00 creates/s, 0.24 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: 5661, 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
Main thread process no. 3917, id 46970152433408, state: sleeping
Number of rows inserted 312986, updated 523245, deleted 246719, read 1091162641460.24 inserts/s, 0.39 updates/s, 0.16 deletes/s, 72657.77 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
1 row in set (0.04 sec)
ERROR:
No query specified
任何帮助将非常感激。谢谢。