Terms-ApsaraDB for HBase(Hbase)-阿里云帮助中心

Common terms used in Lindorm CQL syntax, with their Lindorm definitions and descriptions.

Term	Definition in Lindorm	Description
keyspace	namespace	A keyspace is a top-level container that holds multiple tables. Properties defined on a keyspace apply to all tables in it.
table	table	A table stores data. Define the table schema, including column names and types, when you create the table.
PRIMARY KEY	PRIMARY KEY	A primary key uniquely identifies a row and determines where the row is stored. In Lindorm CQL, a primary key consists of a partition key and clustering columns. The primary key definition in Lindorm CQL differs from Cassandra CQL.
partition key	Component of a primary key	A partition key always works with clustering columns to form a complete primary key.
cluster column	Component of a primary key	Cluster columns work together with the partition key to form a complete primary key.
regular column	COLUMN	Any column that is not part of the primary key.
secondary index	secondary index	A secondary index accelerates the speed of queries. Use a secondary index when you need to query by a column that is not part of the primary key.
search index	search index	A search index supports multi-dimension queries, statistical analysis, and fuzzy match. Use a search index when secondary index queries are insufficient for your access patterns.