When you create a table, you can define one or more of its columns as sort keys. When data is initially loaded into the empty table, the values in the sort key columns are stored on disk in sorted order.
Redshift supports four distribution styles; AUTO, EVEN, KEY, or ALL. KEY distribution A single column acts as a distribution key (DISTKEY) and helps place matching values on the same node slice. As a rule of thumb, choose a column that: Is uniformly distributed –Otherwise skew data will ...
A compound key is made up of all of the columns listed in the sort key definition, in the order they are listed. A compound sort key is most useful when a query's filter applies conditions, such as filters and joins, that use a prefix of the sort keys. T
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在自动 (AUTO) 分配方式下,Amazon Redshift 基于表数据大小分配最佳分配方式。例如,如果指定 AUTO 分配方式,Amazon Redshift 最初向小型表指定的是 ALL 分配方式。当表变大时,Amazon Redshift 可能会将分配方式更改为 KEY,选择主键(或复合主键的列)作为分配键。如果表变大且没有任何一列适合用作分配键,Amazon ...
When the table grows larger, Amazon Redshift might change the distribution style to KEY, choosing the primary key (or a column of the composite primary key) as the distribution key. If the table grows larger and none of the columns are suitable to be the distribution key, Amazon Redshift ...