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860d507b
编写于
12月 24, 2004
作者:
B
Bruce Momjian
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电子邮件补丁
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Updates from Ian Barwick.
Update FAQ with new URL's for site.
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doc/FAQ
浏览文件 @
860d507b
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri Dec 24 12:1
3:41
EST 2004
Last updated: Fri Dec 24 12:1
8:49
EST 2004
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
doc/src/FAQ/FAQ.html
浏览文件 @
860d507b
...
...
@@ -10,17 +10,19 @@
alink=
"#0000ff"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated:
Wed Dec 15 20:06:34
EST 2004
</P>
<P>
Last updated:
Fri Dec 24 12:18:49
EST 2004
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
<BR>
</P>
<P>
The most recent version of this document can be viewed at
<A
href=
"http://www.PostgreSQL.org/docs/faqs/FAQ.html"
>
http://www.PostgreSQL.org/docs/faqs/FAQ.html
</A>
.
</P>
"http://www.postgresql.org/files/documentation/faqs/FAQ.html"
>
http://www.postgresql.org/files/documentation/faqs/FAQ.html
</A>
.
</P>
<P>
Platform-specific questions are answered at
<A
href=
"http://www.PostgreSQL.org/docs/index.html"
>
http://www.PostgreSQL.org/docs/index.html
</A>
.
</P>
"http://www.postgresql.org/docs/faq/"
>
http://www.postgresql.org/docs/faq/
</A>
.
</P>
<HR>
<H2
align=
"center"
>
General Questions
</H2>
...
...
@@ -177,7 +179,8 @@
responsible for all development of PostgreSQL. It is a community
project and is not controlled by any company. To get involved, see
the developer's FAQ at
<A
href=
"http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html"
>
http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html
</A>
"http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html"
>
http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html
</A>
</P>
<P>
The authors of PostgreSQL 1.01 were Andrew Yu and Jolly Chen.
...
...
@@ -339,8 +342,9 @@
href=
"http://techdocs.PostgreSQL.org/"
>
http://techdocs.PostgreSQL.org/
</A>
.
</P>
<P><I>
psql
</I>
has some nice \d commands to show information about
types, operators, functions, aggregates, etc.
</P>
<P>
The command line client program
<I>
psql
</I>
has some \d commands to show
information about types, operators, functions, aggregates, etc. - use \? to
display the available commands.
</P>
<P>
Our web site contains even more documentation.
</P>
...
...
@@ -398,8 +402,8 @@
<H4><A
name=
"1.13"
>
1.13
</A>
) How do I submit a bug report?
</H4>
<P>
Visit the PostgreSQL bug form at
<A
href=
"http://www.postgresql.org/
bugform.html
"
>
http://www.postgresql.org/
bugform.html
</A>
.
</P>
"http://www.postgresql.org/
support/submitbug
"
>
http://www.postgresql.org/
support/submitbug
</A>
.
</P>
<P>
Also check out our ftp site
<A
href=
"ftp://ftp.PostgreSQL.org/pub"
>
ftp://ftp.PostgreSQL.org/pub
</A>
to
...
...
@@ -425,21 +429,15 @@
<DT><B>
Performance
</B></DT>
<DD>
PostgreSQL
has performance similar
to other commercial and
open source databases.
i
t is faster for some things, slower for
<DD>
PostgreSQL
's performance is comparable
to other commercial and
open source databases.
I
t is faster for some things, slower for
others. In comparison to MySQL or leaner database systems, we are
faster for multiple users, complex queries, and a read/write query
load. MySQL is faster for simple SELECT queries done by a few users.
Of course, MySQL does not have most of the features mentioned in the
<I>
Features
</I>
section above. We are built for reliability and
features, and we continue to improve performance in every
release. There is an interesting Web page comparing PostgreSQL to
MySQL at
<A
href=
"http://openacs.org/philosophy/why-not-mysql.html"
>
http://openacs.org/philosophy/why-not-mysql.html
</A>
Also, MySQL is
is a company that distributes its products via open source, and requires
a commercial license for close-source software, not an
open source development community like PostgreSQL.
<BR>
release.
<BR>
<BR>
</DD>
...
...
@@ -498,12 +496,12 @@
"contributions" item is solely to support the PostgreSQL project
and does not fund any specific company. If you prefer, you can also
send a check to the contact address.
</P>
<HR>
<P>
Also, if you have a success story about PostgreSQL, please
submit
it to our advocacy
site at
<a
href=
"http://advocacy.
postgresql.org"
>
http://advocacy.
postgresql.org
</a>
.
</P>
<P>
Also, if you have a success story about PostgreSQL, please
email
it to our advocacy
list at
<a
href=
"mailto:pgsql-advocacy@
postgresql.org"
>
pgsql-advocacy@
postgresql.org
</a>
.
</P>
<HR>
<H2
align=
"center"
>
User Client Questions
</H2>
...
...
@@ -544,7 +542,7 @@
<P>
Yes, there are several graphical interfaces to PostgreSQL available.
These include PgAccess
<a
href=
"http://www.pgaccess.org"
>
http://www.pgaccess.org
</a>
),
P
gAdmin III (
<a
http://www.pgaccess.org
</a>
),
p
gAdmin III (
<a
href=
"http://www.pgadmin.org"
>
http://www.pgadmin.org
</a>
, RHDB Admin (
<a
href=
"http://sources.redhat.com/rhdb/"
>
http://sources.redhat.com/rhdb/
</a>
), TORA (
<a
href=
"http://www.globecom.net/tora/"
>
http://www.globecom.net/tora/
...
...
@@ -674,9 +672,9 @@
kernel's limit on shared memory space. Each buffer is 8K and the
default is 1000 buffers.
</P>
<P>
You can also use the
<I>
sort_mem
</I>
and
<I>
work_mem
</I>
options
to increase the maximum amount of memory used by the backend processes
for each temporary sort. The default is 1024 (i.e. 1MB).
</P>
<P>
You can also use the
<I>
sort_mem
</I>
(from PostgreSQL 8.0:
<I>
work_mem
</I>
)
options to increase the maximum amount of memory used by the backend
processes
for each temporary sort. The default is 1024 (i.e. 1MB).
</P>
<P>
You can also use the
<SMALL>
CLUSTER
</SMALL>
command to group
data in tables to match an index. See the
<SMALL>
CLUSTER
</SMALL>
...
...
@@ -1170,14 +1168,14 @@ BYTEA bytea variable-length byte array (null-byte safe)
execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
new_id = execute("SELECT currval('person_id_seq')");
</PRE>
Finally, you could use the
<A
href=
"#4.16"
><SMALL>
OID
</SMALL></A>
<P>
Finally, you could use the
<A
href=
"#4.16"
><SMALL>
OID
</SMALL></A>
returned from the
<SMALL>
INSERT
</SMALL>
statement to look up the
default value, though this is probably the least portable approach,
and the oid value will wrap around when it reaches 4 billion.
In Perl, using DBI with
Edmund Mergl's DBD::Pg module, the oid
value is made
available via
<I>
$sth-
>
{pg_oid_status}
</I>
after
<I>
$sth-
>
execute()
</I>
.
In Perl, using DBI with
the DBD::Pg module, the oid value is made
available via
<I>
$sth-
>
{pg_oid_status}
</I>
after
<I>
$sth-
>
execute()
</I>
.
</P>
<H4><A
name=
"4.15.3"
>
4.15.3
</A>
) Doesn't
<I>
currval()
</I>
lead to a race condition with other users?
</H4>
...
...
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