lt_createdb — creates a new LightDB database.
lt_createdb [connection-option...] [option...] [dbname
[description]]
lt_createdb is a tool to create a LightDB database.
lt_createdb is a wrapper for the createdb command. It is equivalent to creating a database using the createdb command directly. However, in a distributed environment (Canopy), it automatically creates the database on all nodes, and these databases together form a distributed cluster.
Note: Canopy is related to databases. This tool only checks the deployment status of Canopy in the LightDB database, retrieves the list of Canopy nodes from the LightDB database, and then creates a database with the same name on each node.
lt_createdb accepts the following command-line arguments:
dbnameSpecifies the name of the database to be created. The name must be unique among all LightDB databases in this cluster. The default is to create a database with the same name as the current system user.
-D tablespace--tablespace=tablespaceSpecifies the default tablespace for the database. (This name is processed as a double-quoted identifier.)
-e--echoEcho the commands that lt_createdb generates and sends to the server.
-E encoding--encoding=encodingSpecifies the character encoding scheme to be used in this database. The character sets supported by the LightDB server are described in Section 21.3.1.
-l locale--locale=locale
Specifies the locale to be used in this database. This is equivalent
to specifying both --lc-collate and --lc-ctype.
--lc-collate=localeSpecifies the LC_COLLATE setting to be used in this database.
--lc-ctype=localeSpecifies the LC_CTYPE setting to be used in this database.
-O owner--owner=ownerSpecifies the database user who will own the new database. (This name is processed as a double-quoted identifier.)
-T template--template=templateSpecifies the template database from which to build this database. (This name is processed as a double-quoted identifier.)
--compatible-type=compatible-typecompatible type. TYPE=off: not compatible with other database features. off, mysql and oracle can be set.
--mysql-lower-case=mysql-lower-caseWhether to enable the all-lowercase feature in MySQL compatibility mode. The value is one of (1, true, on, 0, false, off), the default value is 1.
--ascii-zero-store-value=ascii-zero-store-valueWhether to store another ASCII value for ASCII ZERO. Available value range from 0 to 32 (including 0 and 32).
-V--versionPrint the lt_createdb version and exit.
-?--helpShow help about lt_createdb command line arguments, and exit.
lt_createdb also accepts the following command-line arguments for connection parameters:
-h host--host=hostSpecifies 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.
-p port--port=portSpecifies the TCP port or the local Unix domain socket file extension on which the server is listening for connections.
-U username--username=usernameUser name to connect as.
-w--no-password
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.
-W--passwordForce lt_createdb to prompt for a password before connecting to a database.
This option is never essential, since
lt_createdb will automatically prompt
for a password if the server demands password authentication.
However, lt_createdb 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.
--maintenance-db=dbname
Specifies the name of the database to connect to when creating the
new database. If not specified, the postgres
database will be used; if that does not exist (or if it is the name
of the new database being created), template1 will
be used.
This can be a connection
string. If so, connection string parameters will override any
conflicting command line options.
LTDATABASEIf set, the name of the database to create, unless overridden on the command line.
LTHOSTLTPORTLTUSER
Default connection parameters. LTUSER also
determines the name of the database to create, if it is not
specified on the command line or by LTDATABASE.
LT_COLOR
Specifies whether to use color in diagnostic messages. Possible values
are always, auto and
never.
This utility, like most other LightDB utilities, also uses the environment variables supported by libpq (see Section 31.14).
Execute on a cn node to create a distributed database named
demo:
$lt_createdb demo
To create a non-distributed database named
demo using the
template1 template database on a non-cn node host
eden with port 5000, here are the command-line command:
$lt_createdb -p 5000 -h eden -T template1 -e demo