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Monday, 19 December 2016

How to Create Indexes in Cassandra Database

How to CREATE INDEX

Using the CREATE INDEX statement we can create a secondary index on a table.

Syntax: - CREATE INDEX [ index_name ] ON table_name (column_name)

Remark Point: -
  • An index name is optional and must be unique within a keyspace.
  • If you do not provide a name, Cassandra will assign a name like column_name_idx.

Example:-

cqlsh:payroll> CREATE INDEX erank ON exam_year_name (rank);
cqlsh:payroll> select * from exam_year_name where rank=1;

 exam_year | exam_name                 | rank | examlist_name
-----------+---------------------------+------+---------------
      2015 | Public Service Commission |    1 |         UPPSC
      2015 |  Teacher Eligibility Test |    1 |          CTET

(2 rows)
cqlsh:payroll> CREATE INDEX userIndex ON NerdMovies (user);
cqlsh:payroll> CREATE INDEX ON Mutants (abilityId);
cqlsh:payroll> CREATE INDEX ON users (keys(favs));

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