postgresql/doc/src/sgml/ref/createdb.sgml

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

450 lines
14 KiB
Plaintext
Raw Normal View History

<!--
2010-09-20 22:08:53 +02:00
doc/src/sgml/ref/createdb.sgml
PostgreSQL documentation
-->
<refentry id="app-createdb">
<indexterm zone="app-createdb">
<primary>createdb</primary>
</indexterm>
<refmeta>
<refentrytitle><application>createdb</application></refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo>Application</refmiscinfo>
</refmeta>
<refnamediv>
<refname>createdb</refname>
<refpurpose>create a new <productname>PostgreSQL</productname> database</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>createdb</command>
<arg rep="repeat"><replaceable>connection-option</replaceable></arg>
<arg rep="repeat"><replaceable>option</replaceable></arg>
<arg choice="opt"><replaceable>dbname</replaceable>
<arg choice="opt"><replaceable>description</replaceable></arg></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="r1-app-createdb-1">
<title>Description</title>
<para>
<application>createdb</application> creates a new <productname>PostgreSQL</productname>
database.
</para>
<para>
Normally, the database user who executes this command becomes the owner of
the new database.
However, a different owner can be specified via the <option>-O</option>
option, if the executing user has appropriate privileges.
</para>
<para>
<application>createdb</application> is a wrapper around the
Improve <xref> vs. <command> formatting in the documentation SQL commands are generally marked up as <command>, except when a link to a reference page is used using <xref>. But the latter doesn't create monospace markup, so this looks strange especially when a paragraph contains a mix of links and non-links. We considered putting <command> in the <refentrytitle> on the target side, but that creates some formatting side effects elsewhere. Generally, it seems safer to solve this on the link source side. We can't put the <xref> inside the <command>; the DTD doesn't allow this. DocBook 5 would allow the <command> to have the linkend attribute itself, but we are not there yet. So to solve this for now, convert the <xref>s to <link> plus <command>. This gives the correct look and also gives some more flexibility what we can put into the link text (e.g., subcommands or other clauses). In the future, these could then be converted to DocBook 5 style. I haven't converted absolutely all xrefs to SQL command reference pages, only those where we care about the appearance of the link text or where it was otherwise appropriate to make the appearance match a bit better. Also in some cases, the links where repetitive, so in those cases the links where just removed and replaced by a plain <command>. In cases where we just want the link and don't specifically care about the generated link text (typically phrased "for further information see <xref ...>") the xref is kept. Reported-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org> Discussion: https://www.postgresql.org/message-id/flat/87o8pco34z.fsf@wibble.ilmari.org
2020-10-03 16:16:51 +02:00
<acronym>SQL</acronym> command <link linkend="sql-createdatabase"><command>CREATE DATABASE</command></link>.
2003-09-12 02:12:47 +02:00
There is no effective difference between creating databases via
this utility and via other methods for accessing the server.
</para>
2003-09-12 02:12:47 +02:00
</refsect1>
<refsect1>
<title>Options</title>
2002-10-12 01:03:48 +02:00
<para>
<application>createdb</application> accepts the following command-line arguments:
2002-10-12 01:03:48 +02:00
<variablelist>
<varlistentry>
2002-10-12 01:03:48 +02:00
<term><replaceable class="parameter">dbname</replaceable></term>
<listitem>
<para>
Specifies the name of the database to be created. The name must be
unique among all <productname>PostgreSQL</productname> databases in this cluster.
2002-10-12 01:03:48 +02:00
The default is to create a database with the same name as the
current system user.
</para>
</listitem>
</varlistentry>
<varlistentry>
2002-10-12 01:03:48 +02:00
<term><replaceable class="parameter">description</replaceable></term>
<listitem>
<para>
Specifies a comment to be associated with the newly created
database.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-D <replaceable class="parameter">tablespace</replaceable></option></term>
<term><option>--tablespace=<replaceable class="parameter">tablespace</replaceable></option></term>
<listitem>
<para>
Specifies the default tablespace for the database. (This name
is processed as a double-quoted identifier.)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-e</option></term>
<term><option>--echo</option></term>
<listitem>
<para>
Echo the commands that <application>createdb</application> generates
and sends to the server.
</para>
</listitem>
</varlistentry>
2011-05-10 21:37:22 +02:00
<varlistentry>
<term><option>-E <replaceable class="parameter">encoding</replaceable></option></term>
<term><option>--encoding=<replaceable class="parameter">encoding</replaceable></option></term>
2011-05-10 21:37:22 +02:00
<listitem>
<para>
Specifies the character encoding scheme to be used in this
database. The character sets supported by the
<productname>PostgreSQL</productname> server are described in
<xref linkend="multibyte-charset-supported"/>.
2011-05-10 21:37:22 +02:00
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l <replaceable class="parameter">locale</replaceable></option></term>
<term><option>--locale=<replaceable class="parameter">locale</replaceable></option></term>
<listitem>
<para>
Specifies the locale to be used in this database. This is equivalent
to specifying <option>--lc-collate</option>,
<option>--lc-ctype</option>, and <option>--icu-locale</option> to the
same value. Some locales are only valid for ICU and must be set with
<option>--icu-locale</option>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--lc-collate=<replaceable class="parameter">locale</replaceable></option></term>
<listitem>
<para>
Specifies the LC_COLLATE setting to be used in this database.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--lc-ctype=<replaceable class="parameter">locale</replaceable></option></term>
<listitem>
<para>
Specifies the LC_CTYPE setting to be used in this database.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--builtin-locale=<replaceable class="parameter">locale</replaceable></option></term>
<listitem>
<para>
Specifies the locale name when the builtin provider is used. Locale support
is described in <xref linkend="locale"/>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--icu-locale=<replaceable class="parameter">locale</replaceable></option></term>
<listitem>
<para>
Specifies the ICU locale ID to be used in this database, if the
ICU locale provider is selected.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--icu-rules=<replaceable class="parameter">rules</replaceable></option></term>
<listitem>
<para>
Specifies additional collation rules to customize the behavior of the
default collation of this database. This is supported for ICU only.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--locale-provider={<literal>builtin</literal>|<literal>libc</literal>|<literal>icu</literal>}</option></term>
<listitem>
<para>
Specifies the locale provider for the database's default collation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-O <replaceable class="parameter">owner</replaceable></option></term>
<term><option>--owner=<replaceable class="parameter">owner</replaceable></option></term>
<listitem>
<para>
Specifies the database user who will own the new database.
(This name is processed as a double-quoted identifier.)
</para>
</listitem>
</varlistentry>
Add new block-by-block strategy for CREATE DATABASE. Because this strategy logs changes on a block-by-block basis, it avoids the need to checkpoint before and after the operation. However, because it logs each changed block individually, it might generate a lot of extra write-ahead logging if the template database is large. Therefore, the older strategy remains available via a new STRATEGY parameter to CREATE DATABASE, and a corresponding --strategy option to createdb. Somewhat controversially, this patch assembles the list of relations to be copied to the new database by reading the pg_class relation of the template database. Cross-database access like this isn't normally possible, but it can be made to work here because there can't be any connections to the database being copied, nor can it contain any in-doubt transactions. Even so, we have to use lower-level interfaces than normal, since the table scan and relcache interfaces will not work for a database to which we're not connected. The advantage of this approach is that we do not need to rely on the filesystem to determine what ought to be copied, but instead on PostgreSQL's own knowledge of the database structure. This avoids, for example, copying stray files that happen to be located in the source database directory. Dilip Kumar, with a fairly large number of cosmetic changes by me. Reviewed and tested by Ashutosh Sharma, Andres Freund, John Naylor, Greg Nancarrow, Neha Sharma. Additional feedback from Bruce Momjian, Heikki Linnakangas, Julien Rouhaud, Adam Brusselback, Kyotaro Horiguchi, Tomas Vondra, Andrew Dunstan, Álvaro Herrera, and others. Discussion: http://postgr.es/m/CA+TgmoYtcdxBjLh31DLxUXHxFVMPGzrU5_T=CYCvRyFHywSBUQ@mail.gmail.com
2022-03-29 17:31:43 +02:00
<varlistentry>
<term><option>-S <replaceable class="parameter">strategy</replaceable></option></term>
Add new block-by-block strategy for CREATE DATABASE. Because this strategy logs changes on a block-by-block basis, it avoids the need to checkpoint before and after the operation. However, because it logs each changed block individually, it might generate a lot of extra write-ahead logging if the template database is large. Therefore, the older strategy remains available via a new STRATEGY parameter to CREATE DATABASE, and a corresponding --strategy option to createdb. Somewhat controversially, this patch assembles the list of relations to be copied to the new database by reading the pg_class relation of the template database. Cross-database access like this isn't normally possible, but it can be made to work here because there can't be any connections to the database being copied, nor can it contain any in-doubt transactions. Even so, we have to use lower-level interfaces than normal, since the table scan and relcache interfaces will not work for a database to which we're not connected. The advantage of this approach is that we do not need to rely on the filesystem to determine what ought to be copied, but instead on PostgreSQL's own knowledge of the database structure. This avoids, for example, copying stray files that happen to be located in the source database directory. Dilip Kumar, with a fairly large number of cosmetic changes by me. Reviewed and tested by Ashutosh Sharma, Andres Freund, John Naylor, Greg Nancarrow, Neha Sharma. Additional feedback from Bruce Momjian, Heikki Linnakangas, Julien Rouhaud, Adam Brusselback, Kyotaro Horiguchi, Tomas Vondra, Andrew Dunstan, Álvaro Herrera, and others. Discussion: http://postgr.es/m/CA+TgmoYtcdxBjLh31DLxUXHxFVMPGzrU5_T=CYCvRyFHywSBUQ@mail.gmail.com
2022-03-29 17:31:43 +02:00
<term><option>--strategy=<replaceable class="parameter">strategy</replaceable></option></term>
<listitem>
<para>
Specifies the database creation strategy. See
<xref linkend="create-database-strategy" /> for more details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-T <replaceable class="parameter">template</replaceable></option></term>
<term><option>--template=<replaceable class="parameter">template</replaceable></option></term>
<listitem>
<para>
Specifies the template database from which to build this
database. (This name is processed as a double-quoted identifier.)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-V</option></term>
<term><option>--version</option></term>
<listitem>
<para>
Print the <application>createdb</application> version and exit.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-?</option></term>
<term><option>--help</option></term>
<listitem>
<para>
Show help about <application>createdb</application> command line
arguments, and exit.
</para>
</listitem>
</varlistentry>
2002-10-12 01:03:48 +02:00
</variablelist>
</para>
2002-10-12 01:03:48 +02:00
<para>
The options <option>-D</option>, <option>-l</option>, <option>-E</option>,
2002-10-12 01:03:48 +02:00
<option>-O</option>, and
<option>-T</option> correspond to options of the underlying
Improve <xref> vs. <command> formatting in the documentation SQL commands are generally marked up as <command>, except when a link to a reference page is used using <xref>. But the latter doesn't create monospace markup, so this looks strange especially when a paragraph contains a mix of links and non-links. We considered putting <command> in the <refentrytitle> on the target side, but that creates some formatting side effects elsewhere. Generally, it seems safer to solve this on the link source side. We can't put the <xref> inside the <command>; the DTD doesn't allow this. DocBook 5 would allow the <command> to have the linkend attribute itself, but we are not there yet. So to solve this for now, convert the <xref>s to <link> plus <command>. This gives the correct look and also gives some more flexibility what we can put into the link text (e.g., subcommands or other clauses). In the future, these could then be converted to DocBook 5 style. I haven't converted absolutely all xrefs to SQL command reference pages, only those where we care about the appearance of the link text or where it was otherwise appropriate to make the appearance match a bit better. Also in some cases, the links where repetitive, so in those cases the links where just removed and replaced by a plain <command>. In cases where we just want the link and don't specifically care about the generated link text (typically phrased "for further information see <xref ...>") the xref is kept. Reported-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org> Discussion: https://www.postgresql.org/message-id/flat/87o8pco34z.fsf@wibble.ilmari.org
2020-10-03 16:16:51 +02:00
SQL command <link linkend="sql-createdatabase"><command>CREATE DATABASE</command></link>; see there for more information
2002-10-12 01:03:48 +02:00
about them.
</para>
<para>
<application>createdb</application> also accepts the following
command-line arguments for connection parameters:
<variablelist>
<varlistentry>
<term><option>-h <replaceable class="parameter">host</replaceable></option></term>
<term><option>--host=<replaceable class="parameter">host</replaceable></option></term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p <replaceable class="parameter">port</replaceable></option></term>
<term><option>--port=<replaceable class="parameter">port</replaceable></option></term>
<listitem>
<para>
Specifies the TCP port or the local Unix domain socket file
extension on which the server is listening for connections.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-U <replaceable class="parameter">username</replaceable></option></term>
<term><option>--username=<replaceable class="parameter">username</replaceable></option></term>
<listitem>
<para>
User name to connect as.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-w</option></term>
<term><option>--no-password</option></term>
<listitem>
<para>
Never issue a password prompt. If the server requires
password authentication and a password is not available by
other means such as a <filename>.pgpass</filename> 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.
</para>
</listitem>
</varlistentry>
2002-10-12 01:03:48 +02:00
<varlistentry>
<term><option>-W</option></term>
<term><option>--password</option></term>
2002-10-12 01:03:48 +02:00
<listitem>
<para>
Force <application>createdb</application> to prompt for a
password before connecting to a database.
</para>
<para>
This option is never essential, since
<application>createdb</application> will automatically prompt
for a password if the server demands password authentication.
However, <application>createdb</application> will waste a
connection attempt finding out that the server wants a password.
In some cases it is worth typing <option>-W</option> to avoid the extra
connection attempt.
2002-10-12 01:03:48 +02:00
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--maintenance-db=<replaceable class="parameter">dbname</replaceable></option></term>
<listitem>
<para>
Specifies the name of the database to connect to when creating the
new database. If not specified, the <literal>postgres</literal>
database will be used; if that does not exist (or if it is the name
of the new database being created), <literal>template1</literal> will
be used.
This can be a <link linkend="libpq-connstring">connection
string</link>. If so, connection string parameters will override any
conflicting command line options.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
2002-10-12 01:03:48 +02:00
</refsect1>
<refsect1>
<title>Environment</title>
<variablelist>
<varlistentry>
<term><envar>PGDATABASE</envar></term>
<listitem>
<para>
If set, the name of the database to create, unless overridden on
the command line.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><envar>PGHOST</envar></term>
<term><envar>PGPORT</envar></term>
<term><envar>PGUSER</envar></term>
<listitem>
<para>
Default connection parameters. <envar>PGUSER</envar> also
determines the name of the database to create, if it is not
specified on the command line or by <envar>PGDATABASE</envar>.
</para>
</listitem>
</varlistentry>
Unified logging system for command-line programs This unifies the various ad hoc logging (message printing, error printing) systems used throughout the command-line programs. Features: - Program name is automatically prefixed. - Message string does not end with newline. This removes a common source of inconsistencies and omissions. - Additionally, a final newline is automatically stripped, simplifying use of PQerrorMessage() etc., another common source of mistakes. - I converted error message strings to use %m where possible. - As a result of the above several points, more translatable message strings can be shared between different components and between frontends and backend, without gratuitous punctuation or whitespace differences. - There is support for setting a "log level". This is not meant to be user-facing, but can be used internally to implement debug or verbose modes. - Lazy argument evaluation, so no significant overhead if logging at some level is disabled. - Some color in the messages, similar to gcc and clang. Set PG_COLOR=auto to try it out. Some colors are predefined, but can be customized by setting PG_COLORS. - Common files (common/, fe_utils/, etc.) can handle logging much more simply by just using one API without worrying too much about the context of the calling program, requiring callbacks, or having to pass "progname" around everywhere. - Some programs called setvbuf() to make sure that stderr is unbuffered, even on Windows. But not all programs did that. This is now done centrally. Soft goals: - Reduces vertical space use and visual complexity of error reporting in the source code. - Encourages more deliberate classification of messages. For example, in some cases it wasn't clear without analyzing the surrounding code whether a message was meant as an error or just an info. - Concepts and terms are vaguely aligned with popular logging frameworks such as log4j and Python logging. This is all just about printing stuff out. Nothing affects program flow (e.g., fatal exits). The uses are just too varied to do that. Some existing code had wrappers that do some kind of print-and-exit, and I adapted those. I tried to keep the output mostly the same, but there is a lot of historical baggage to unwind and special cases to consider, and I might not always have succeeded. One significant change is that pg_rewind used to write all error messages to stdout. That is now changed to stderr. Reviewed-by: Donald Dong <xdong@csumb.edu> Reviewed-by: Arthur Zakirov <a.zakirov@postgrespro.ru> Discussion: https://www.postgresql.org/message-id/flat/6a609b43-4f57-7348-6480-bd022f924310@2ndquadrant.com
2019-04-01 14:24:37 +02:00
<varlistentry>
<term><envar>PG_COLOR</envar></term>
<listitem>
<para>
Specifies whether to use color in diagnostic messages. Possible values
are <literal>always</literal>, <literal>auto</literal> and
Unified logging system for command-line programs This unifies the various ad hoc logging (message printing, error printing) systems used throughout the command-line programs. Features: - Program name is automatically prefixed. - Message string does not end with newline. This removes a common source of inconsistencies and omissions. - Additionally, a final newline is automatically stripped, simplifying use of PQerrorMessage() etc., another common source of mistakes. - I converted error message strings to use %m where possible. - As a result of the above several points, more translatable message strings can be shared between different components and between frontends and backend, without gratuitous punctuation or whitespace differences. - There is support for setting a "log level". This is not meant to be user-facing, but can be used internally to implement debug or verbose modes. - Lazy argument evaluation, so no significant overhead if logging at some level is disabled. - Some color in the messages, similar to gcc and clang. Set PG_COLOR=auto to try it out. Some colors are predefined, but can be customized by setting PG_COLORS. - Common files (common/, fe_utils/, etc.) can handle logging much more simply by just using one API without worrying too much about the context of the calling program, requiring callbacks, or having to pass "progname" around everywhere. - Some programs called setvbuf() to make sure that stderr is unbuffered, even on Windows. But not all programs did that. This is now done centrally. Soft goals: - Reduces vertical space use and visual complexity of error reporting in the source code. - Encourages more deliberate classification of messages. For example, in some cases it wasn't clear without analyzing the surrounding code whether a message was meant as an error or just an info. - Concepts and terms are vaguely aligned with popular logging frameworks such as log4j and Python logging. This is all just about printing stuff out. Nothing affects program flow (e.g., fatal exits). The uses are just too varied to do that. Some existing code had wrappers that do some kind of print-and-exit, and I adapted those. I tried to keep the output mostly the same, but there is a lot of historical baggage to unwind and special cases to consider, and I might not always have succeeded. One significant change is that pg_rewind used to write all error messages to stdout. That is now changed to stderr. Reviewed-by: Donald Dong <xdong@csumb.edu> Reviewed-by: Arthur Zakirov <a.zakirov@postgrespro.ru> Discussion: https://www.postgresql.org/message-id/flat/6a609b43-4f57-7348-6480-bd022f924310@2ndquadrant.com
2019-04-01 14:24:37 +02:00
<literal>never</literal>.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
This utility, like most other <productname>PostgreSQL</productname> utilities,
also uses the environment variables supported by <application>libpq</application>
(see <xref linkend="libpq-envars"/>).
</para>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<para>
In case of difficulty, see <xref linkend="sql-createdatabase"/>
and <xref linkend="app-psql"/> for
discussions of potential problems and error messages.
The database server must be running at the
targeted host. Also, any default connection settings and environment
variables used by the <application>libpq</application> front-end
library will apply.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To create the database <literal>demo</literal> using the default
database server:
<screen>
<prompt>$ </prompt><userinput>createdb demo</userinput>
</screen>
</para>
<para>
To create the database <literal>demo</literal> using the
server on host <literal>eden</literal>, port 5000, using the
<literal>template0</literal> template database, here is the
command-line command and the underlying SQL command:
<screen>
<prompt>$ </prompt><userinput>createdb -p 5000 -h eden -T template0 -e demo</userinput>
<computeroutput>CREATE DATABASE demo TEMPLATE template0;</computeroutput>
</screen></para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="app-dropdb"/></member>
<member><xref linkend="sql-createdatabase"/></member>
</simplelist>
</refsect1>
</refentry>