Thanks Ngoc, Jack On Tue, May 12, 2015 at 4:56 AM, Ngoc Minh VO <ngocminh...@bnpparibas.com> wrote:
> Hello, > > > > The problem with your approach is: you will need to specify all the 30 > filters (in the pre-defined order in PK) when querying. > > > > I would go for this data model: > > CREATE TABLE t ( > > name text, > > filter_name1 text, filter_value1 text, > > filter_name2 text, filter_value2 text, > > filter_name3 text, filter_value3 text, -- since you only have up to 3 > filters in one query > > PRIMARY KEY (name, f_n1, f_v1, f_n2, f_v2, f_n3, f_v3) > > ); > > > > And denormalize the data when you import to the table : > > One line in Oracle table with K filters become C(3, K) lines in C* table. > > > > Best regards, > > Minh > > > > *From:* Alaa Zubaidi (PDF) [mailto:alaa.zuba...@pdf.com] > *Sent:* lundi 11 mai 2015 20:32 > *To:* user@cassandra.apache.org > *Subject:* CQL Data Model question > > > > Hi, > > > > I am trying to port an Oracle Table to Cassandra. > > the table is a wide table (931 columns) and could have millions of rows. > > name, filter1, filter2....filter30, data1, data2...data900 > > > > The user would retrieve multiple rows from this table and filter (30 > filter columns) by one or more (up to 3) of the filter columns, it could be > any of the filter columns. > > (select * from table1 where name = .. and filter1 = .. and filter5= .. ;) > > > > What is the best design for this in Cassandra/CQL? > > > > I tried the following: > > Create table tab1 ( > > name text, > > flt1 text, > > flt2 text, > > flt3 text, > > .. > > flt30 text, > > data text, > > PRIMARY KEY (name, flt1, flt2, flt3, ..... flt30) ); > > > > Is there any side effects of having 30 composite keys? > > > > Thanks > > > *This message may contain confidential and privileged information. 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