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Postgres FD Implementation
Commit 3fb8c9d1 authored by Bruce Momjian's avatar Bruce Momjian
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Update FAQ.

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doc/FAQ
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Features Features
PostgreSQL has most features present in large commercial PostgreSQL has most features present in large commercial
DBMS's, like transactions, subselects, triggers, views, and DBMS's, like transactions, subselects, triggers, views, foreign
sophisticated locking. We have some features they don't have, key referential integrity, and sophisticated locking. We have
like user-defined types, inheritance, rules, and multi-version some features they don't have, like user-defined types,
concurrency control to reduce lock contention. We don't have inheritance, rules, and multi-version concurrency control to
foreign key referential integrity or outer joins, but are reduce lock contention. We don't have outer joins, but are
working on them for our next release. working on them for our next release.
Performance Performance
...@@ -396,10 +396,10 @@ ...@@ -396,10 +396,10 @@
2.1) Are there ODBC drivers for PostgreSQL? 2.1) Are there ODBC drivers for PostgreSQL?
There are two ODBC drivers available, PostODBC and OpenLink ODBC. There are two ODBC drivers available, PsqlODBC and OpenLink ODBC.
PostODBC is included in the distribution. More information about it PsqlODBC is included in the distribution. More information about it
can be gotten from: http://www.insightdist.com/psqlodbc can be gotten from: ftp://ftp.postgresql.org/pub/odbc/index.html
OpenLink ODBC can be gotten from http://www.openlinksw.com. It works OpenLink ODBC can be gotten from http://www.openlinksw.com. It works
with their standard ODBC client software so you'll have PostgreSQL with their standard ODBC client software so you'll have PostgreSQL
...@@ -410,6 +410,8 @@ ...@@ -410,6 +410,8 @@
commercial-quality support, but a freeware version will always be commercial-quality support, but a freeware version will always be
available. Questions to postgres95@openlink.co.uk. available. Questions to postgres95@openlink.co.uk.
See also the ODBC chapter of the Programmer's Guide.
2.2) What tools are available for hooking PostgreSQL to Web pages? 2.2) What tools are available for hooking PostgreSQL to Web pages?
A nice introduction to Database-backed Web pages can be seen at: A nice introduction to Database-backed Web pages can be seen at:
...@@ -972,12 +974,9 @@ BYTEA bytea variable-length array of bytes ...@@ -972,12 +974,9 @@ BYTEA bytea variable-length array of bytes
4.22) How do I create a column that will default to the current time? 4.22) How do I create a column that will default to the current time?
This way always works: Use now():
CREATE TABLE test (x int, modtime timestamp default now() ); CREATE TABLE test (x int, modtime timestamp default now() );
In releases 7.0 and later, you may use:
create table test (x int, modtime timestamp default 'now');
4.23) Why are my subqueries using IN so slow? 4.23) Why are my subqueries using IN so slow?
Currently, we join subqueries to outer queries by sequential scanning Currently, we join subqueries to outer queries by sequential scanning
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doc/src/FAQ.html
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...@@ -434,10 +434,10 @@ reliability, support, and price.<P> ...@@ -434,10 +434,10 @@ reliability, support, and price.<P>
<DD> <DD>
PostgreSQL has most features present in large commercial DBMS's, like PostgreSQL has most features present in large commercial DBMS's, like
transactions, subselects, triggers, views, and sophisticated locking. transactions, subselects, triggers, views, foreign key referential
We have some features they don't have, like user-defined types, integrity, and sophisticated locking. We have some features they don't
inheritance, rules, and multi-version concurrency control to reduce lock have, like user-defined types, inheritance, rules, and multi-version
contention. We don't have foreign key referential integrity or outer concurrency control to reduce lock contention. We don't have outer
joins, but are working on them for our next release.<BR><BR> joins, but are working on them for our next release.<BR><BR>
<DT> <B>Performance</B> <DT> <B>Performance</B>
...@@ -506,11 +506,11 @@ in our BSD-style license stated above.<BR><BR> ...@@ -506,11 +506,11 @@ in our BSD-style license stated above.<BR><BR>
<H4><A NAME="2.1">2.1</A>) Are there ODBC drivers for PostgreSQL?</H4><P> <H4><A NAME="2.1">2.1</A>) Are there ODBC drivers for PostgreSQL?</H4><P>
There are two ODBC drivers available, PostODBC and OpenLink ODBC.<P> There are two ODBC drivers available, PsqlODBC and OpenLink ODBC.<P>
PostODBC is included in the distribution. More information about it can PsqlODBC is included in the distribution. More information about it can
be gotten from: <A HREF="http://www.insightdist.com/psqlodbc"> be gotten from: <A HREF="ftp://ftp.postgresql.org/pub/odbc/index.html">
http://www.insightdist.com/psqlodbc</A><P> ftp://ftp.postgresql.org/pub/odbc/index.html</A><P>
OpenLink ODBC can be gotten from <A HREF="http://www.openlinksw.com/"> OpenLink ODBC can be gotten from <A HREF="http://www.openlinksw.com/">
http://www.openlinksw.com</A>. It works with their standard ODBC client http://www.openlinksw.com</A>. It works with their standard ODBC client
...@@ -522,6 +522,8 @@ commercial-quality support, but a freeware version will always be ...@@ -522,6 +522,8 @@ commercial-quality support, but a freeware version will always be
available. Questions to <A available. Questions to <A
HREF="mailto:postgres95@openlink.co.uk">postgres95@openlink.co.uk</A>.<P> HREF="mailto:postgres95@openlink.co.uk">postgres95@openlink.co.uk</A>.<P>
See also the <A HREF="http://www.postgresql.org/docs/programmer/odbc.htm">
ODBC chapter of the Programmer's Guide</A>.<P>
<H4><A NAME="2.2">2.2</A>) What tools are available for hooking <H4><A NAME="2.2">2.2</A>) What tools are available for hooking
...@@ -1054,7 +1056,7 @@ you need to dump and reload the database, you need to use <I>pg_dump's -o</I> ...@@ -1054,7 +1056,7 @@ you need to dump and reload the database, you need to use <I>pg_dump's -o</I>
option or <SMALL>COPY WITH OIDS</SMALL> option to preserve the oids.<P> option or <SMALL>COPY WITH OIDS</SMALL> option to preserve the oids.<P>
For more details, see Bruce Momjian's chapter on For more details, see Bruce Momjian's chapter on
<A HREF="http://www.postgresql.org/docs/aw_pgsql_book/node74.html">Numbering Rows.</A> <A HREF="http://www.postgresql.org/docs/aw_pgsql_book">Numbering Rows.</A>
<H4><A NAME="4.16.2">4.16.2</A>) How do I get the back the generated SERIAL value after an insert?</H4><P> <H4><A NAME="4.16.2">4.16.2</A>) How do I get the back the generated SERIAL value after an insert?</H4><P>
Probably the simplest approach is to to retrieve the next SERIAL value from the sequence object with the <I>nextval()</I> function <I>before</I> inserting and then insert it explicitly. Using the example table in <A HREF="#4.16.1">4.16.1</A>, that might look like this: Probably the simplest approach is to to retrieve the next SERIAL value from the sequence object with the <I>nextval()</I> function <I>before</I> inserting and then insert it explicitly. Using the example table in <A HREF="#4.16.1">4.16.1</A>, that might look like this:
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