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
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