tests, it cannot guarantee that the database will not reach a state
in which the constraint condition is false (due to subsequent changes
of the other row(s) involved). This would cause a database dump and
- reload to fail. The reload could fail even when the complete
+ restore to fail. The restore could fail even when the complete
database state is consistent with the constraint, due to rows not
being loaded in an order that will satisfy the constraint. If
possible, use <literal>UNIQUE</literal>, <literal>EXCLUDE</literal>,
If what you desire is a one-time check against other rows at row
insertion, rather than a continuously-maintained consistency
guarantee, a custom <link linkend="triggers">trigger</link> can be used
- to implement that. (This approach avoids the dump/reload problem because
+ to implement that. (This approach avoids the dump/restore problem because
<application>pg_dump</application> does not reinstall triggers until after
- reloading data, so that the check will not be enforced during a
- dump/reload.)
+ restoring data, so that the check will not be enforced during a
+ dump/restore.)
</para>
</note>
function. <productname>PostgreSQL</productname> does not disallow
that, but it will not notice if there are rows in the table that now
violate the <literal>CHECK</literal> constraint. That would cause a
- subsequent database dump and reload to fail.
+ subsequent database dump and restore to fail.
The recommended way to handle such a change is to drop the constraint
(using <command>ALTER TABLE</command>), adjust the function definition,
and re-add the constraint, thereby rechecking it against all table rows.
<application>pg_dump</application>. But that behavior is undesirable for a
configuration table; any data changes made by the user need to be
included in dumps, or the extension will behave differently after a dump
- and reload.
+ and restore.
</para>
<indexterm>
<para>
Dump scripts generated by <application>pg_dump</application> automatically apply
- several, but not all, of the above guidelines. To reload a
+ several, but not all, of the above guidelines. To restore a
<application>pg_dump</application> dump as quickly as possible, you need to
do a few extra things manually. (Note that these points apply while
<emphasis>restoring</emphasis> a dump, not while <emphasis>creating</emphasis> it.
attached to a function when <varname>check_function_bodies</varname> is on.
Therefore, checks whose results might be affected by GUC parameters
definitely should be skipped when <varname>check_function_bodies</varname> is
- off, to avoid false failures when reloading a dump.
+ off, to avoid false failures when restoring a dump.
</para>
<para>
around</quote> since the original creation of the enum type). The slowdown is
usually insignificant; but if it matters, optimal performance can be
regained by dropping and recreating the enum type, or by dumping and
- reloading the database.
+ restoring the database.
</para>
</refsect1>
function. <productname>PostgreSQL</productname> does not disallow that,
but it will not notice if there are stored values of the domain type that
now violate the <literal>CHECK</literal> constraint. That would cause a
- subsequent database dump and reload to fail. The recommended way to
+ subsequent database dump and restore to fail. The recommended way to
handle such a change is to drop the constraint (using <command>ALTER
DOMAIN</command>), adjust the function definition, and re-add the
constraint, thereby rechecking it against stored data.
useful for making dumps that can be loaded into
non-<productname>PostgreSQL</productname> databases.
However, since this option generates a separate command for each row,
- an error in reloading a row causes only that row to be lost rather
+ an error in restoring a row causes only that row to be lost rather
than the entire table contents.
</para>
</listitem>
This option is relevant only when creating a data-only dump.
It instructs <application>pg_dump</application> to include commands
to temporarily disable triggers on the target tables while
- the data is reloaded. Use this if you have referential
+ the data is restored. Use this if you have referential
integrity checks or other triggers on the tables that you
- do not want to invoke during data reload.
+ do not want to invoke during data restore.
</para>
<para>
it is mainly useful for making dumps that can be loaded into
non-<productname>PostgreSQL</productname> databases.
However, since this option generates a separate command for each row,
- an error in reloading a row causes only that row to be lost rather
+ an error in restoring a row causes only that row to be lost rather
than the entire table contents.
Note that
the restore might fail altogether if you have rearranged column order.
target the root of the partitioning hierarchy that contains it, rather
than the partition itself. This causes the appropriate partition to
be re-determined for each row when the data is loaded. This may be
- useful when reloading data on a server where rows do not always fall
+ useful when restoring data on a server where rows do not always fall
into the same partitions as they did on the original server. That
could happen, for example, if the partitioning column is of type text
and the two systems have different definitions of the collation used
with this option, because <application>pg_restore</application> will
not know exactly which partition(s) a given archive data item will
load data into. This could result in inefficiency due to lock
- conflicts between parallel jobs, or perhaps even reload failures due
+ conflicts between parallel jobs, or perhaps even restore failures due
to foreign key constraints being set up before all the relevant data
is loaded.
</para>
This option is relevant only when creating a data-only dump.
It instructs <application>pg_dumpall</application> to include commands
to temporarily disable triggers on the target tables while
- the data is reloaded. Use this if you have referential
+ the data is restored. Use this if you have referential
integrity checks or other triggers on the tables that you
- do not want to invoke during data reload.
+ do not want to invoke during data restore.
</para>
<para>
target the root of the partitioning hierarchy that contains it, rather
than the partition itself. This causes the appropriate partition to
be re-determined for each row when the data is loaded. This may be
- useful when reloading data on a server where rows do not always fall
+ useful when restoring data on a server where rows do not always fall
into the same partitions as they did on the original server. That
could happen, for example, if the partitioning column is of type text
and the two systems have different definitions of the collation used
</para>
<para>
- To reload database(s) from this file, you can use:
+ To restore database(s) from this file, you can use:
<screen>
<prompt>$</prompt> <userinput>psql -f db.out postgres</userinput>
</screen>
After running this command, it should be possible to start the server,
but bear in mind that the database might contain inconsistent data due to
partially-committed transactions. You should immediately dump your data,
- run <command>initdb</command>, and reload. After reload, check for
+ run <command>initdb</command>, and restore. After restore, check for
inconsistencies and repair as needed.
</para>
discussed below. If you are not able to determine correct values for all
these fields, <option>-f</option> can still be used, but
the recovered database must be treated with even more suspicion than
- usual: an immediate dump and reload is imperative. <emphasis>Do not</emphasis>
+ usual: an immediate dump and restore is imperative. <emphasis>Do not</emphasis>
execute any data-modifying operations in the database before you dump,
as any such action is likely to make the corruption worse.
</para>
This option is relevant only when performing a data-only restore.
It instructs <application>pg_restore</application> to execute commands
to temporarily disable triggers on the target tables while
- the data is reloaded. Use this if you have referential
+ the data is restored. Use this if you have referential
integrity checks or other triggers on the tables that you
- do not want to invoke during data reload.
+ do not want to invoke during data restore.
</para>
<para>
</para>
<para>
- To reload the dump into a new database called <literal>newdb</literal>:
+ To restore the dump into a new database called <literal>newdb</literal>:
<screen>
<prompt>$</prompt> <userinput>createdb -T template0 newdb</userinput>
<para>
<application>pg_upgrade</application> (formerly called <application>pg_migrator</application>) allows data
stored in <productname>PostgreSQL</productname> data files to be upgraded to a later <productname>PostgreSQL</productname>
- major version without the data dump/reload typically required for
+ major version without the data dump/restore typically required for
major version upgrades, e.g., from 9.5.8 to 9.6.4 or from 10.7 to 11.2.
It is not required for minor version upgrades, e.g., from 9.6.2 to 9.6.3
or from 10.1 to 10.2.
<para>
The <option>--jobs</option> option allows multiple CPU cores to be used
- for copying/linking of files and to dump and reload database schemas
+ for copying/linking of files and to dump and restore database schemas
in parallel; a good place to start is the maximum of the number of
CPU cores and tablespaces. This option can dramatically reduce the
time to upgrade a multi-database server running on a multiprocessor
For <emphasis>major</emphasis> releases of <productname>PostgreSQL</productname>, the
internal data storage format is subject to change, thus complicating
upgrades. The traditional method for moving data to a new major version
- is to dump and reload the database, though this can be slow. A
+ is to dump and restore the database, though this can be slow. A
faster method is <xref linkend="pgupgrade"/>. Replication methods are
also available, as discussed below.
</para>
<para>
One upgrade method is to dump data from one major version of
- <productname>PostgreSQL</productname> and reload it in another — to do
+ <productname>PostgreSQL</productname> and restore it in another — to do
this, you must use a <emphasis>logical</emphasis> backup tool like
<application>pg_dumpall</application>; file system
level backup methods will not work. (There are checks in place that prevent
explicitly when creating <type>tsvector</type> values inside triggers,
so that the column's contents will not be affected by changes to
<varname>default_text_search_config</varname>. Failure to do this is likely to
- lead to problems such as search results changing after a dump and reload.
+ lead to problems such as search results changing after a dump and restore.
</para>
</sect2>
projects / thirdparty / postgresql.git / commitdiff
