Global Secondary Indexes¶
Global Secondary Indexes is production ready in Scylla Open Source 3.0 and Scylla Enterprise 2019.1.x
CQL supports creating secondary indexes on tables, allowing queries on the table to use those indexes. A secondary index is identified by a name defined by:
index_name ::= re('[a-zA-Z_0-9]+')
Creating a secondary index on a table uses the
CREATE INDEX statement:
create_index_statement ::= CREATE INDEX [
index_identifier')' [ USING
string[ WITH OPTIONS =
map_literal] ] index_identifier ::=
column_name| ( FULL ) '('
CREATE INDEX userIndex ON NerdMovies (user); CREATE INDEX ON Mutants (abilityId);
CREATE INDEX statement is used to create a new (automatic) secondary index for a given (existing) column in a
given table. A name for the index itself can be specified before the
ON keyword, if desired. If data already exists
for the column, it will be indexed asynchronously. After the index is created, new data for the column is indexed
automatically at insertion time.
Local Secondary Index¶
New in version Scylla: 3.1
Local Secondary Indexes is an enhancement of Global Secondary Indexes, which allows Scylla to optimize the use case in which the partition key of the base table is also the partition key of the index. Local Secondary Index syntax is the same as above, with extra parentheses on the partition key.
column_name| ( PK ) | KEYS | VALUES | FULL ) '('
CREATE TABLE menus (location text, name text, price float, dish_type text, PRIMARY KEY(location, name)); CREATE INDEX ON menus((location),dish_type);
More on Local Secondary Indexes
Dropping a secondary index uses the
DROP INDEX statement:
drop_index_statement ::= DROP INDEX [ IF EXISTS ]
DROP INDEX statement is used to drop an existing secondary index. The argument of the statement is the index
name, which may optionally specify the keyspace of the index.
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