Postgresql 中文操作指南
Synopsis
clusterdb [ connection-option …] [ —verbose | -v ] [ —table | -t table ] … [ dbname ]
clusterdb [connection-option…] [ —verbose | -v ] [ —table | -t table ] … [dbname]
clusterdb [ connection-option …] [ —verbose | -v ] —all | -a
clusterdb [connection-option…] [ —verbose | -v ] —all | -a
Description
clusterdb 是用于在 PostgreSQL 数据库中重新对表进行集群的实用程序。它找到先前已进行集群的表，然后使用上次使用的相同索引再次对它们进行集群。从未进行过集群的表不会受到影响。
clusterdb is a utility for reclustering tables in a PostgreSQL database. It finds tables that have previously been clustered, and clusters them again on the same index that was last used. Tables that have never been clustered are not affected.
clusterdb 是用于 SQL 命令 CLUSTER 的包装器。通过此实用程序对数据库进行集群与通过其他服务器访问方法进行集群之间没有有效差异。
clusterdb is a wrapper around the SQL command CLUSTER. There is no effective difference between clustering databases via this utility and via other methods for accessing the server.
Options
clusterdb 接受以下命令行参数：
clusterdb accepts the following command-line arguments:
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-a_—all_
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Cluster all databases.
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[-d] _dbname[--dbname=]_dbname
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Specifies the name of the database to be clustered, when -a/—all is not used. If this is not specified, the database name is read from the environment variable PGDATABASE. If that is not set, the user name specified for the connection is used. The dbname can be a connection string. If so, connection string parameters will override any conflicting command line options.
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-e_—echo_
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Echo the commands that clusterdb generates and sends to the server.
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-q_—quiet_
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Do not display progress messages.
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-t _table—table=_table
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Cluster table only. Multiple tables can be clustered by writing multiple -t switches.
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-v_—verbose_
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Print detailed information during processing.
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-V_—version_
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Print the clusterdb version and exit.
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-?_—help_
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Show help about clusterdb command line arguments, and exit.
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clusterdb 还接受以下命令行参数作为连接参数：
clusterdb also accepts the following command-line arguments for connection parameters:
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-h _host—host=_host
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Specifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix domain socket.
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-p _port—port=_port
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Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
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-U _username—username=_username
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User name to connect as.
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-w_—no-password_
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Never issue a password prompt. If the server requires password authentication and a password is not available by other means such as a .pgpass file, the connection attempt will fail. This option can be useful in batch jobs and scripts where no user is present to enter a password.
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-W_—password_
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Force clusterdb to prompt for a password before connecting to a database.
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This option is never essential, since clusterdb will automatically prompt for a password if the server demands password authentication. However, clusterdb will waste a connection attempt finding out that the server wants a password. In some cases it is worth typing -W to avoid the extra connection attempt.
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—maintenance-db=_dbname_
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Specifies the name of the database to connect to to discover which databases should be clustered, when -a/—all is used. If not specified, the postgres database will be used, or if that does not exist, template1 will be used. This can be a connection string. If so, connection string parameters will override any conflicting command line options. Also, connection string parameters other than the database name itself will be re-used when connecting to other databases.
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Environment
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PGDATABASE_PGHOST_PGPORT__PGUSER
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Default connection parameters
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PG_COLOR
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Specifies whether to use color in diagnostic messages. Possible values are always, auto and never.
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此实用程序与大多数其他 PostgreSQL 实用程序一样，还使用 libpq 支持的环境变量（请参阅 Section 34.15 ）。
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 34.15).