Greenplum+Hadoop学习笔记-14-定义数据库对象之创建与管理表空间，hadoop-14-

[gpadmin@master gpfs]$ gpfilespace --help

COMMAND NAME: gpfilespace

Creates a filespace using a configuration file that defines per-segment file system locations. Filespaces describe the physical file system resources to be used by a tablespace.

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SYNOPSIS

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gpfilespace [<connection_option> ...] [-l <logfile_directory>]  [-o [<output_fs_config_file>]]

gpfilespace [<connection_option> ...] [-l <logfile_directory>]    -c <fs_config_file>

gpfilespace movetempfilespace {<filespace_name>|default}

gpfilespace movetransfilespace {<filespace_name>|default}

gpfilespace --showtempfilespace

gpfilespace --showtransfilespace

gpfilespace -v | -?

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DESCRIPTION

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A tablespace requires a file system location to store its database files. In Greenplum Database, the master and each segment (primary and mirror) needs its own distinct storage location. This collection of file system locations for all components in a Greenplum system is referred to as a filespace. Once a filespace is defined, it can be used by one or more tablespaces.

When used with the -o option, the gpfilespace utility looks up your system configuration information in the Greenplum Database catalog tables and prompts you for the appropriate file system locations needed to create the filespace. It then outputs a configuration file that can be used to create a filespace. If a file name is

not specified, a gpfilespace_config_<#> file will be created in the current directory by default. 

Once you have a configuration file, you can run gpfilespace with the -c option to create the filespace in Greenplum Database.

You will need to create a filespace before you can use the gpfilespace --movetempfilespace or --movetransfilespace option to move your temporary or transaction files to the new location.

Use either gpfilespace --showtempfilespace or --showtransfilespace options to show the name of the filespace currently associated with temporary or transaction files.

Note: If segments are down due to a power or nic failure, you may see inconsistencies during filespace creation. You may not be able to bring up the Greenplum Database.

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OPTIONS

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-c | --config <fs_config_file>

 A configuration file containing:

 * An initial line denoting the new filespace name. For example: filespace:myfs

 * One line each for the master, the primary segments, and the    mirror segments. A line describes a file system location that  a particular segment database instance should use as its data  directory location to store database files associated with a  tablespace. Each line is in the format of:

   <hostname>:<dbid>:/<filesystem_dir>/<seg_datadir_name>

-l | --logdir <logfile_directory>

 The directory to write the log file. Defaults to ~/gpAdminLogs.

-o | --output <output_file_name>

 The directory location and file name to output the generated  filespace configuration file. You will be prompted to enter a  name for the filespace, a master file system location, the primary segment file system locations, and the mirror segment file system locations. For example, if your configuration has  2 primary and 2 mirror segments per host, you will be prompted for a total of 5 locations (including the master). The file system locations must exist on all hosts in your system prior  to running the gpfilespace utility. The utility will designate  segment-specific data directories within the location(s) you  specify, so it is possible to use the same location for multiple  segments. However, primaries and mirrors cannot use the same  location. After the utility creates the configuration file, you  can manually edit the file to make any required changes to the  filespace layout before creating the filespace in Greenplum Database.

--movetempfilespace {<filespace_name>|default}

 Moves temporary files to a new filespace or to the default location.

--movetransfilespace {<filespace_name>|default}

 Moves transaction files to a new filespace or to the default location.

--showtempfilespace

 Show the name of the filespace currently associated with temporary  files. This option checks that all primary and mirror segments, master  and master standby are using the same filespace or temporary files.You will receive a warning message and an email if any inconsistencies  exist.

--showtransfilespace

 Show the name of the filespace currently associated with transaction  files. This option checks that all primary and mirror segments, master  and master standby are using the same filespace or transaction files. You will receive a warning message and an email if any inconsistencies exist.

-v | --version (show utility version)

 Displays the version of this utility.

-? | --help (help)

 Displays the utility usage and syntax.

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CONNECTION OPTIONS

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-h host | --host host

 The host name of the machine on which the Greenplum master  database server is running. If not specified, reads from  the environment variable PGHOST or defaults to localhost.

-p port | --port port

 The TCP port on which the Greenplum master database server is listening for connections. If not specified, reads from  the environment variable PGPORT or defaults to 5432.

-U username | --username superuser_name

 The database superuser role name to connect as. If not specified, reads from the environment variable PGUSER or  defaults to the current system user name. Only database  superusers are allowed to create filespaces.

-W | --password

 Force a password prompt.

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EXAMPLES

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Create a filespace configuration file. You will be prompted to enter a name for the filespace, a master file system location, the primary segment file system locations, and the mirror segment file system locations. For example, if your configuration has 2 primary and 2 mirror segments per host, you will be prompted for a total of 5 locations