--- layout: global title: CACHE TABLE displayTitle: CACHE TABLE license: | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --- ### Description `CACHE TABLE` statement caches contents of a table or output of a query with the given storage level. This reduces scanning of the original files in future queries. ### Syntax {% highlight sql %} CACHE [ LAZY ] TABLE table_identifier [ OPTIONS ( 'storageLevel' [ = ] value ) ] [ [ AS ] query ] {% endhighlight %} ### Parameters
LAZY
table_identifier
[ database_name. ] table_name
OPTIONS ( 'storageLevel' [ = ] value )
OPTIONS
clause with storageLevel
key and value pair. A Warning is issued when a key other than storageLevel
is used. The valid options for storageLevel
are:
NONE
DISK_ONLY
DISK_ONLY_2
MEMORY_ONLY
MEMORY_ONLY_2
MEMORY_ONLY_SER
MEMORY_ONLY_SER_2
MEMORY_AND_DISK
MEMORY_AND_DISK_2
MEMORY_AND_DISK_SER
MEMORY_AND_DISK_SER_2
OFF_HEAP
storageLevel
. If storageLevel
is not explicitly set using OPTIONS
clause, the default storageLevel
is set to MEMORY_AND_DISK
.
query
SELECT
statementTABLE
statementFROM
statement