January 2002
Intermediate to advanced
640 pages
16h 39m
English
Content preview from Practical PostgreSQL
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Cluster
Provides the backend server with clustering information about a table.
Synopsis
CLUSTER indexname ON tablename
Parameters
indexnameThe name of the index to use in clustering.
tablenameThe name of the table you wish to cluster.
Results
CLUSTERThe message returned when a table is successfully clustered.
ERROR: CLUSTER: "indexname" is not an index for table "tablename"The error returned if you attempt to cluster an index
indexnamewhich is not placed on the specified table (tablename).ERROR: Index "indexname" does not existThe error returned if the specified index (
indexname) cannot be found in the connected database.ERROR: Relation "tablename" does not existThe error returned if the specified table (
tablename) cannot be found in the connected database.ERROR: Relation "child_table" inherits from "tablename"The error returned if the specified table (
tablename) is inherited by another table (child_table).
Description
Use the CLUSTER command to cluster a table on a specific index. The
table (identified by the tablename parameter) must
already, exist and the index (identified by the indexname parameter) must exist, and be placed on the table.
During clustering, a table is reordered for performance in an arrangement based on the specified index. A cluster is a one-time operation upon a table; to recluster a table, you must execute the command again.
Note
When a cluster is created, the rows of ...
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