第二章 SQL参考命令-CLUSTER

CLUSTER

根据一个索引对磁盘上的物理重新排序堆存储表。Greenplum数据引擎不推荐此操作。

概要

CLUSTER indexname ON tablename

CLUSTER tablename

CLUSTER

描述

When a table is clustered using thiscommand, Greenplum Database remembers on which index it was clustered. The formcluster tablename reclusters the table on the sameindex that it was clustered before. CLUSTER without any parameter reclustersall previously clustered tables in the current database that the calling userowns, or all tables if called by a superuser. This form of cluster cannot be executedinside a transaction block.

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