Catalog.CacheTable(String) Method
Definition
Important
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Caches the specified table in-memory.
Spark SQL can cache tables using an in-memory columnar format by calling
CacheTable("tableName") or DataFrame.Cache(). Spark SQL will scan only required
columns and will automatically tune compression to minimize memory usage and GC
pressure. You can call UncacheTable("tableName") to remove the table from memory.
public void CacheTable (string tableName);member this.CacheTable : string -> unitPublic Sub CacheTable (tableName As String)Parameters
- tableName
- String
Is either a qualified or unqualified name that designates a table. If no database identifier is provided, it refers to a table in the current database.