步骤1：准备工作

使用DataArts Studio前的准备

如果您是第一次使用DataArts Studio，请参考准备工作章节完成注册华为账号、购买DataArts Studio实例、创建工作空间等一系列操作。然后进入到对应的工作空间，即可开始使用DataArts Studio。

数据源准备

本示例演示数据来自：https://grouplens.org/datasets/movielens/100k/，即1000名用户对1700部电影的100,000个评分数据。获取链接中的zip数据包并解压，其中的“u.item”和“u.data”文件分别为电影信息和评分信息。

为方便演示，本示例提供了用于模拟原始数据的部分数据。为了方便将源数据集成到云上，我们需要先将样例数据存储为CSV文件，将CSV文件上传至OBS服务中。

创建CSV文件（UTF-8无bom格式），文件名称为对应的数据表名，将后文提供的各样例数据分别拷贝粘贴到不同CSV文件中，然后保存CSV文件。
以下是Windows下生成.csv文件的办法之一：
1. 使用文本编辑工具（例如记事本等）新建一个txt文档，将后文提供的样例数据拷贝进文档中。注意拷贝后检查数据的行数及数据分行的正确性（注意，如果是从PDF文档中拷贝样例数据，单行的数据过长时会产生换行，需手动重新调整为单行）。
2. 点击“文件 > 另存为”，在弹出的对话框中，“保存类型”选择为“所有文件(*.*)”，在“文件名”处输入文件名和.csv后缀，选择“UTF-8”编码格式（不能带BOM），则能以CSV格式保存该文件。
将源数据CSV文件上传到OBS服务。
1. 登录控制台，选择“存储 > 对象存储服务 OBS”，进入OBS控制台。
2. 单击“创建桶”，然后根据页面提示配置参数，创建一个名称为“fast-demo”的OBS桶。
  
  为保证网络互通，OBS桶区域请选择和DataArts Studio实例相同的区域。如果需要选择企业项目，也请选择与DataArts Studio实例相同的企业项目。
  
  使用OBS控制台创建桶的操作，请参见《对象存储服务控制台指南》中的创建桶。
3. 上传数据到名称为“fast-demo”的OBS桶中。
  使用OBS控制台上传文件的操作，请参见《对象存储服务控制台指南》中的上传文件。

本示例中涉及到两部分样例数据，分别为电影数据movies.csv和评分数据ratings.csv。具体数据和说明如下：

movies.csv：

movieId,movieTitle,videoReleaseDate,IMDbURL,unknown,Action,Adventure,Animation,Childrens,Comedy,Crime,Documentary,Drama,Fantasy,FilmNoir,Horror,Musical,Mystery,Romance,SciFi,Thriller,War,Western
1,Toy Story (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Toy%20Story%20(1995),0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0
2,GoldenEye (1995),1-Jan-95,http://us.imdb.com/M/title-exact?GoldenEye%20(1995),0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0
3,Four Rooms (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Four%20Rooms%20(1995),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0
4,Get Shorty (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Get%20Shorty%20(1995),0,1,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0
5,Copycat (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Copycat%20(1995),0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,1,0,0
6,Shanghai Triad (Yao a yao yao dao waipo qiao) (1995),1-Jan-95,http://us.imdb.com/Title?Yao+a+yao+yao+dao+waipo+qiao+(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
7,Twelve Monkeys (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Twelve%20Monkeys%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0
8,Babe (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Babe%20(1995),0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0
9,Dead Man Walking (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Dead%20Man%20Walking%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
10,Richard III (1995),22-Jan-96,http://us.imdb.com/M/title-exact?Richard%20III%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0
11,Seven (Se7en) (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Se7en%20(1995),0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0
12,"Usual Suspects, The (1995)",14-Aug-95,"http://us.imdb.com/M/title-exact?Usual%20Suspects,%20The%20(1995)",0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0
13,Mighty Aphrodite (1995),30-Oct-95,http://us.imdb.com/M/title-exact?Mighty%20Aphrodite%20(1995),0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
14,"Postino, Il (1994)",1-Jan-94,"http://us.imdb.com/M/title-exact?Postino,%20Il%20(1994)",0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0
15,Mr. Holland's Opus (1995),29-Jan-96,http://us.imdb.com/M/title-exact?Mr.%20Holland's%20Opus%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
16,French Twist (Gazon maudit) (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Gazon%20maudit%20(1995),0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0
17,From Dusk Till Dawn (1996),5-Feb-96,http://us.imdb.com/M/title-exact?From%20Dusk%20Till%20Dawn%20(1996),0,1,0,0,0,1,1,0,0,0,0,1,0,0,0,0,1,0,0
18,"White Balloon, The (1995)",1-Jan-95,http://us.imdb.com/M/title-exact?Badkonake%20Sefid%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
19,Antonia's Line (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Antonia%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
20,Angels and Insects (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Angels%20and%20Insects%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0
21,Muppet Treasure Island (1996),16-Feb-96,http://us.imdb.com/M/title-exact?Muppet%20Treasure%20Island%20(1996),0,1,1,0,0,1,0,0,0,0,0,0,1,0,0,0,1,0,0
22,Braveheart (1995),16-Feb-96,http://us.imdb.com/M/title-exact?Braveheart%20(1995),0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0
23,Taxi Driver (1976),16-Feb-96,http://us.imdb.com/M/title-exact?Taxi%20Driver%20(1976),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0
24,Rumble in the Bronx (1995),23-Feb-96,http://us.imdb.com/M/title-exact?Hong%20Faan%20Kui%20(1995),0,1,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0
25,"Birdcage, The (1996)",8-Mar-96,"http://us.imdb.com/M/title-exact?Birdcage,%20The%20(1996)",0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
26,"Brothers McMullen, The (1995)",1-Jan-95,"http://us.imdb.com/M/title-exact?Brothers%20McMullen,%20The%20(1995)",0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
27,Bad Boys (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Bad%20Boys%20(1995),0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
28,Apollo 13 (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Apollo%2013%20(1995),0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0
29,Batman Forever (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Batman%20Forever%20(1995),0,1,1,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0
30,Belle de jour (1967),1-Jan-67,http://us.imdb.com/M/title-exact?Belle%20de%20jour%20(1967),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
31,Crimson Tide (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Crimson%20Tide%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,0
32,Crumb (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Crumb%20(1994),0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0
33,Desperado (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Desperado%20(1995),0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0
34,"Doom Generation, The (1995)",1-Jan-95,"http://us.imdb.com/M/title-exact?Doom%20Generation,%20The%20(1995)",0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0
35,Free Willy 2: The Adventure Home (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Free%20Willy%202:%20The%20Adventure%20Home%20(1995),0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0
36,Mad Love (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Mad%20Love%20(1995),0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0
37,Nadja (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Nadja%20(1994),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
38,"Net, The (1995)",1-Jan-95,"http://us.imdb.com/M/title-exact?Net,%20The%20(1995)",0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0
39,Strange Days (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Strange%20Days%20(1995),0,1,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0
40,"To Wong Foo, Thanks for Everything! Julie Newmar (1995)",1-Jan-95,"http://us.imdb.com/M/title-exact?To%20Wong%20Foo,%20Thanks%20for%20Everything!%20Julie%20Newmar%20(1995)",0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
41,Billy Madison (1995),1-Jan-95,http://us.imdb.com/M/title-exact?Billy%20Madison%20(1995),0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
42,Clerks (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Clerks%20(1994),0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0
43,Disclosure (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Disclosure%20(1994),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0
44,Dolores Claiborne (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Dolores%20Claiborne%20(1994),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0
45,Eat Drink Man Woman (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Yinshi%20Nan%20Nu%20(1994),0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0
46,Exotica (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Exotica%20(1994),0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0
47,Ed Wood (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Ed%20Wood%20(1994),0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0
48,Hoop Dreams (1994),1-Jan-94,http://us.imdb.com/M/title-exact?Hoop%20Dreams%20(1994),0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0
49,I.Q. (1994),1-Jan-94,http://us.imdb.com/M/title-exact?I.Q.%20(1994),0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0
50,Star Wars (1977),1-Jan-77,http://us.imdb.com/M/title-exact?Star%20Wars%20(1977),0,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,0,1,0

数据说明如下：

表1 电影数据说明
字段名称	字段类型	字段说明
movieId	INT	电影ID
movieTitle	VARCHAR	电影名
videoReleaseDate	VARCHAR	电影发行日期
IMDbURL	VARCHAR	IMDb链接
unknown	INT	未知，是则为1，否为0
Action	INT	动作，是则为1，否为0
Adventure	INT	冒险，是则为1，否为0
Animation	INT	动画，是则为1，否为0
Childrens	INT	儿童，是则为1，否为0
Comedy	INT	喜剧，是则为1，否为0
Crime	INT	犯罪，是则为1，否为0
Documentary	INT	纪录片，是则为1，否为0
Drama	INT	戏剧，是则为1，否为0
Fantasy	INT	幻想，是则为1，否为0
FilmNoir	INT	黑色，是则为1，否为0
Horror	INT	恐怖，是则为1，否为0
Musical	INT	音乐，是则为1，否为0
Mystery	INT	神秘，是则为1，否为0
Romance	INT	浪漫，是则为1，否为0
SciFi	INT	科幻，是则为1，否为0
Thriller	INT	惊悚，是则为1，否为0
War	INT	战争，是则为1，否为0
Western	INT	西部，是则为1，否为0

ratings.csv：

userId,movieId,rating,timestamp
210,40,3,891035994
224,29,3,888104457
308,1,4,887736532
7,32,4,891350932
10,16,4,877888877
99,4,5,886519097
115,20,3,881171009
138,26,5,879024232
243,15,3,879987440
293,5,3,888906576
162,25,4,877635573
135,23,4,879857765
62,21,3,879373460
59,23,5,888205300
43,14,2,883955745
19,4,4,885412840
5,2,3,875636053
72,48,4,880036718
224,26,3,888104153
299,14,4,877877775
151,10,5,879524921
6,14,5,883599249
250,7,4,878089716
268,2,2,875744173
292,11,5,881104093
181,3,2,878963441
145,15,2,875270655
1,33,4,878542699
276,2,4,874792436
18,26,4,880129731
87,40,3,879876917
272,12,5,879455254
296,20,5,884196921
5,17,4,875636198
128,15,4,879968827
287,1,5,875334088
65,47,2,879216672
1,20,4,887431883
290,50,5,880473582
45,25,4,881014015
109,8,3,880572642
157,25,3,886890787
301,33,4,882078228
62,12,4,879373613
276,40,3,874791871
269,22,1,891448072
10,7,4,877892210
244,17,2,880607205
222,26,3,878183043
185,23,4,883524249
207,13,3,875506839
8,22,5,879362183
222,49,3,878183512
200,11,5,884129542
90,25,5,891384789
15,25,3,879456204
234,10,3,891227851
295,39,4,879518279
217,2,3,889069782
189,20,5,893264466
42,44,3,881108548
268,21,3,875742822
262,28,3,879792220
90,22,4,891384357
270,25,5,876954456
194,23,4,879522819
161,48,1,891170745
58,9,4,884304328
79,50,4,891271545
221,48,5,875245462
223,11,3,891550649
292,9,4,881104148
16,8,5,877722736
17,13,3,885272654
148,1,4,877019411
280,1,4,891700426
110,38,3,886988574
90,12,5,891383241
239,9,5,889180446
311,9,4,884963365
151,13,3,879542688
2,50,5,888552084
8,50,5,879362124
286,44,3,877532173
85,25,2,879452769
274,50,5,878944679
217,27,1,889070011
181,14,1,878962392
297,25,4,874954497
1,47,4,875072125
6,23,4,883601365
222,22,5,878183285
314,28,5,877888346
291,15,5,874833668
94,24,4,885873423
83,43,4,880308690
43,40,3,883956468
44,15,4,878341343
158,24,4,880134261
151,12,5,879524368
66,1,3,883601324
5,1,4,875635748
207,25,4,876079113
109,1,4,880563619
227,50,4,879035347
181,1,3,878962392
213,13,4,878955139
121,14,5,891390014
117,15,5,880125887
85,13,3,879452866
313,22,3,891014870
43,5,4,875981421
11,38,3,891905936
72,28,4,880036824
115,8,5,881171982
95,1,5,879197329
145,22,5,875273021
66,7,3,883601355
267,17,4,878971773
25,25,5,885853415
103,24,4,880415847
87,9,4,879877931
49,47,5,888068715
135,39,3,879857931
269,13,4,891446662
99,50,5,885679998
306,14,5,876503995
291,7,5,874834481
312,28,4,891698300
184,36,3,889910195
305,11,1,886323237
198,7,4,884205317
104,7,3,888465972
293,39,3,888906804
256,25,5,882150552
92,15,3,875640189
1,17,3,875073198
214,42,5,892668130
82,14,4,876311280
305,50,5,886321799
223,8,2,891550684
91,28,4,891439243
315,13,4,879821158
269,9,4,891446246
217,7,4,889069741
49,7,4,888067307
87,2,4,879876074
268,1,3,875742341
262,47,2,879794599
84,12,5,883452874
264,33,3,886122644
224,20,1,888104487
200,24,2,884127370
92,24,3,875640448
276,38,3,874792574
286,34,5,877534701
49,38,1,888068289
311,5,3,884365853
269,47,4,891448386
194,4,4,879521397
57,28,4,883698324
108,50,4,879879739
207,4,4,876198457
181,16,1,878962996
94,9,5,885872684
234,20,4,891227979
68,7,3,876974096
13,14,4,884538727
98,47,4,880498898
53,24,3,879442538
239,10,5,889180338
63,20,3,875748004
276,43,1,874791383
272,48,4,879455143
116,7,2,876453915
26,25,3,891373727
62,24,4,879372633
295,47,5,879518166
63,50,4,875747292
49,17,2,888068651
310,24,4,879436242
7,44,5,891351728
326,22,4,879874989
213,12,5,878955409
222,29,3,878184571
249,11,5,879640868
217,22,5,889069741
189,1,5,893264174
234,50,4,892079237
296,48,5,884197091
81,3,4,876592546
151,15,4,879524879
59,12,5,888204260
246,8,3,884921245
276,34,2,877934264
97,50,5,884239471
244,7,4,880602558
298,8,5,884182748
7,28,5,891352341
41,28,4,890687353

数据说明如下：

表2 评分数据说明
字段名称	字段类型	字段说明
userId	INT	用户ID
movieId	INT	电影ID
rating	INT	评分，5分制
timestamp	VARCHAR	时间戳

数据湖准备

在本示例中，选择数据仓库服务（DWS）服务作为数据湖。

创建DWS集群的具体操作请参见创建集群。为确保DWS集群与DataArts Studio实例网络互通，DWS集群需满足如下要求：

DataArts Studio实例（指DataArts Studio实例中的CDM集群）与DWS集群处于不同区域的情况下，需要通过公网或者专线打通网络。
DataArts Studio实例（指DataArts Studio实例中的CDM集群）与DWS集群同区域情况下，同虚拟私有云、同子网、同安全组的不同实例默认网络互通；如果同虚拟私有云但是子网或安全组不同，还需配置路由规则及安全组规则，配置路由规则请参见如何配置路由规则章节，配置安全组规则请参见如何配置安全组规则章节。
此外，您还必须确保DWS集群与DataArts Studio工作空间所属的企业项目必须相同，如果不同，您需要修改工作空间的企业项目。

创建DWS集群后，您需要在管理中心创建DWS连接，然后通过数据开发组件新建数据库、数据库模式，再执行SQL来创建DWS表。操作步骤如下：

在DataArts Studio控制台首页，选择对应工作空间的“管理中心”模块，进入管理中心页面。

图1 选择管理中心
在“数据连接”页面，单击“创建数据连接”按钮。

图2 数据连接
在弹出窗口中，配置数据连接参数，完成配置后，单击“确定”完成数据连接的创建。参数配置如图3所示。
- 数据连接类型：数据仓库服务（DWS）
- 数据连接名称：dws_link
- 手动：关闭“手动”，“IP”和“端口”不需要手动填写。
- 集群名：选择所创建的DWS集群。
- 用户名：数据库的用户名，创建DWS集群时指定的用户名，默认为dbadmin。
- 密码：数据库的访问密码，创建DWS集群时指定的密码。
- KMS密钥：选择一个KMS密钥，使用KMS密钥对敏感数据进行加密。如果未创建KMS密钥，请单击“访问KMS”进入KMS控制台创建一个密钥。
- 绑定Agent：需选择一个数据集成集群作为连接代理，该集群和DWS集群必须网络互通。本示例可选择创建DataArts Studio实例时自动创建的数据集成集群。
图3 DWS连接配置参数
DWS连接创建完成后，跳转到数据开发页面。

图4 跳转到数据开发页面
创建DWS数据库和数据库模式。
1. 在数据开发界面，在DWS连接上右键单击，选择“新建数据库”，创建一个数据库用于存放数据表，数据库名称为“demo”。
  图5 创建数据库
2. 展开DWS连接目录至demo数据库的数据库模式层级，然后再右键单击，选择“新建模式”，创建数据库模式用于存放数据表，数据库模式名称为“dgc”。
  图6 创建数据库模式
创建一个DWS SQL脚本，以通过DWS SQL语句来创建数据表。

图7 新建脚本

在新建脚本弹出的SQL编辑器中输入如下SQL语句，并点击“运行”来创建数据表。其中，movies_item、ratings_item为原始数据表，具体数据将在之后通过CDM由OBS迁移到表中；top_rating_movie和top_active_movie为结果表，用于存放分析结果。

SET SEARCH_PATH TO dgc;
CREATE TABLE IF NOT EXISTS movies_item(
    movieId INT,
    movieTitle VARCHAR,
    videoReleaseDate VARCHAR,
    IMDbURL VARCHAR,
    unknown INT,
    Action INT,
    Adventure INT,
    Animation INT,
    Childrens INT,
    Comedy INT,
    Crime INT,
    Documentary INT,
    Drama INT,
    Fantasy INT,
    FilmNoir INT,
    Horror INT,
    Musical INT,
    Mystery INT,
    Romance INT,
    SciFi INT,
    Thriller INT,
    War INT,
    Western INT
);

CREATE TABLE IF NOT EXISTS ratings_item(  
  userId INT,
  movieId INT,
  rating INT,
  timestamp VARCHAR
);

CREATE TABLE IF NOT EXISTS top_rating_movie(
  movieTitle VARCHAR,
  avg_rating float,
  rating_user_number int
); 

CREATE TABLE IF NOT EXISTS top_active_movie(
  movieTitle VARCHAR,
  avg_rating float,
  rating_user_number int
);

图8 创建数据表

关键参数说明：

数据连接：步骤3中创建的DWS数据连接。
数据库：步骤5中创建的数据库。

脚本运行成功后，可以通过如下脚本检查数据表是否创建成功。确认数据表创建成功后，该脚本后续无需使用，可直接关闭。
```
SELECT * FROM pg_tables;
```

认证数据准备

当您需要通过CDM迁移OBS数据时，需要通过AK/SK认证方式进行认证鉴权，因此，我们必须先创建访问密钥（AK和SK）。

Access Key Id（AK）：访问密钥ID。与私有访问密钥关联的唯一标识符；访问密钥ID和私有访问密钥一起使用，对请求进行加密签名。
Secret Access Key（SK）：与访问密钥ID结合使用的密钥，对请求进行加密签名，可标识发送方，并防止请求被修改。

您可以通过如下方式获取访问密钥。

登录控制台，在用户名下拉列表中选择“我的凭证”。
进入“我的凭证”页面，选择“访问密钥 > 新增访问密钥”，如图9所示。
图9 单击新增访问密钥
单击“确定”，根据浏览器提示，保存密钥文件。密钥文件会直接保存到浏览器默认的下载文件夹中。打开名称为“credentials.csv”的文件，即可查看访问密钥（Access Key Id和Secret Access Key）。
- 每个用户仅允许新增两个访问密钥。
- 为保证访问密钥的安全，访问密钥仅在初次生成时自动下载，后续不可再次通过管理控制台界面获取。请在生成后妥善保管。