I ask this question because we have a big dim table with 7000,000 records. The dim table is defined as below
Id 分类1 分类2 分类3 品牌 Id cat1 cat2 cat3 brand There are actually 4 dimetions in this table. We have tested 1. don’t join fact table and dim table before building the cube, join tables in query phase , query time is about 10-40 seconds, we define cube with a derived dimention ( id column) and other dimentions in the fact table. I guess kylin store rowkey with column id , not cat1,cat2,cat3,brand ,am I right here? when query by or group by cat1,cat2,cat3, there are scan to the dim table and calculations for the measues. Advantage: less dimentions, only cube Disadvantage: query time is high 2. join tables before building the cube No need to join in query phase. Query time is about 1-3 seconds. Advantage: query time is low Disadvantage: more dimentions, need to split one cube to more if nessesary 发件人: Yang [via Apache Kylin] [mailto:ml-node+s74782n4842...@n6.nabble.com] 发送时间: 2016年6月7日 17:53 收件人: yubo-ds1(于渤.大数据中心.大数据平台部) 主题: Re: a simple question about kylin input and output I'm more curious about the purpose of such requirement. It's not obvious to me. On Thu, Jun 2, 2016 at 6:55 PM, lidong <[hidden email]</user/SendEmail.jtp?type=node&node=4842&i=0>> wrote: > Does Hive view meet your need? > > > Create a Hive view C base on A join B. And make C as input, then get C as > output. > > > Thanks, > Dong > > > Original Message > Sender:[hidden email]</user/SendEmail.jtp?type=node&node=4842&i=1>-[hidden > email]</user/SendEmail.jtp?type=node&node=4842&i=2> > Recipient:[hidden email]</user/SendEmail.jtp?type=node&node=4842&i=3> > Date:Thursday, Jun 2, 2016 18:28 > Subject:a simple question about kylin input and output > > > Hi all: We define a fact table and a dim table as input in a cube, after > cube build finished, we can find a fact table and a dim table in the > "insight" tab as output with same names as we defined. example: input 2 > table: A,B output 2 table: A,B My question is: Is there a way to produce > only one table, which have joined the face table and the dim table? > example: input 2 table :A,B output 1 table : C Thanks in advance for any > hints. Yubo -- View this message in context: > http://apache-kylin.74782.x6.nabble.com/a-simple-question-about-kylin-input-and-output-tp4784.html > Sent from the Apache Kylin mailing list archive at Nabble.com. > ________________________________ If you reply to this email, your message will be added to the discussion below: http://apache-kylin.74782.x6.nabble.com/a-simple-question-about-kylin-input-and-output-tp4784p4842.html To start a new topic under Apache Kylin, email ml-node+s74782n1...@n6.nabble.com To unsubscribe from Apache Kylin, click here<http://apache-kylin.74782.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=1&code=eXViby1kczFAeW9sbzI0LmNvbXwxfC0xMTE5OTYzOTg4>. NAML<http://apache-kylin.74782.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> -- View this message in context: http://apache-kylin.74782.x6.nabble.com/a-simple-question-about-kylin-input-and-output-tp4784p4848.html Sent from the Apache Kylin mailing list archive at Nabble.com.
