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Jakob Huber
postgres-lambda-diff
Commits
cde6056e
Commit
cde6056e
authored
20 years ago
by
Bruce Momjian
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Remove pgsql_tmp directory FAQ item.
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doc/FAQ
+11
-23
11 additions, 23 deletions
doc/FAQ
doc/src/FAQ/FAQ.html
+10
-24
10 additions, 24 deletions
doc/src/FAQ/FAQ.html
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doc/FAQ
+
11
−
23
View file @
cde6056e
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated:
Tue
Feb
1 16:1
0:4
7
EST 2005
Last updated:
Wed
Feb
2 08:4
0:4
2
EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
@@ -41,10 +41,9 @@
3.3) How do I tune the database engine for better performance?
3.4) What debugging features are available?
3.5) Why do I get "Sorry, too many clients" when trying to connect?
3.6) What is in the pgsql_tmp directory?
3.7) Why do I need to do a dump and restore to upgrade PostgreSQL
3.6) Why do I need to do a dump and restore to upgrade PostgreSQL
releases?
3.
8
) What computer hardware should I use?
3.
7
) What computer hardware should I use?
Operational Questions
...
...
@@ -430,18 +429,7 @@
processes it can start by changing the max_connections value in
postgresql.conf and restarting the postmaster.
3.6) What is in the pgsql_tmp directory?
This directory contains temporary files generated by the query
executor. For example, if a sort needs to be done to satisfy an ORDER
BY and the sort requires more space than the backend's -S parameter
allows, then temporary files are created here to hold the extra data.
The temporary files are usually deleted automatically, but might
remain if a backend crashes during a sort. A stop and restart of the
postmaster will remove files from those directories.
3.7) Why do I need to do a dump and restore to upgrade between major
3.6) Why do I need to do a dump and restore to upgrade between major
PostgreSQL releases?
The PostgreSQL team makes only small changes between minor releases,
...
...
@@ -452,7 +440,7 @@
files. A dump outputs data in a generic format that can then be loaded
in using the new internal format.
3.
8
) What computer hardware should I use?
3.
7
) What computer hardware should I use?
Because PC hardware is mostly compatible, people tend to believe that
all PC hardware is of equal quality. It is not. ECC RAM, SCSI, and
...
...
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doc/src/FAQ/FAQ.html
+
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−
24
View file @
cde6056e
...
...
@@ -10,7 +10,7 @@
alink=
"#0000ff"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated:
Tue
Feb
1 16:1
0:4
7
EST 2005
</P>
<P>
Last updated:
Wed
Feb
2 08:4
0:4
2
EST 2005
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
...
...
@@ -61,11 +61,9 @@
<A
href=
"#3.4"
>
3.4
</A>
) What debugging features are available?
<BR>
<A
href=
"#3.5"
>
3.5
</A>
) Why do I get
<I>
"Sorry, too many
clients"
</I>
when trying to connect?
<BR>
<A
href=
"#3.6"
>
3.6
</A>
) What is in the
<I>
pgsql_tmp
</I>
directory?
<BR>
<A
href=
"#3.7"
>
3.7
</A>
) Why do I need to do a dump and restore
<A
href=
"#3.6"
>
3.6
</A>
) Why do I need to do a dump and restore
to upgrade PostgreSQL releases?
<BR>
<A
href=
"#3.
8
"
>
3.
8
</A>
) What computer hardware should I use?
<BR>
<A
href=
"#3.
7
"
>
3.
7
</A>
) What computer hardware should I use?
<BR>
<H2
align=
"center"
>
Operational Questions
</H2>
...
...
@@ -573,19 +571,7 @@
<I>
max_connections
</I>
value in
<I>
postgresql.conf
</I>
and
restarting the
<I>
postmaster
</I>
.
</P>
<H4><A
name=
"3.6"
>
3.6
</A>
) What is in the
<I>
pgsql_tmp
</I>
directory?
</H4>
<P>
This directory contains temporary files generated by the query
executor. For example, if a sort needs to be done to satisfy an
<SMALL>
ORDER BY
</SMALL>
and the sort requires more space than the
backend's
<I>
-S
</I>
parameter allows, then temporary files are created
here to hold the extra data.
</P>
<P>
The temporary files are usually deleted automatically, but might
remain if a backend crashes during a sort. A stop and restart of the
<I>
postmaster
</I>
will remove files from those directories.
</P>
<H4><A
name=
"3.7"
>
3.7
</A>
) Why do I need to do a dump and restore
<H4><A
name=
"3.6"
>
3.6
</A>
) Why do I need to do a dump and restore
to upgrade between major PostgreSQL releases?
</H4>
<P>
The PostgreSQL team makes only small changes between minor releases,
...
...
@@ -596,7 +582,7 @@
data in a generic format that can then be loaded in using the new internal
format.
</P>
<H4><A
name=
"3.
8
"
>
3.
8
</A>
) What computer hardware should I use?
</H4>
<H4><A
name=
"3.
7
"
>
3.
7
</A>
) What computer hardware should I use?
</H4>
<P>
Because PC hardware is mostly compatible, people tend to believe that
all PC hardware is of equal quality. It is not. ECC RAM, SCSI, and
...
...
@@ -672,7 +658,7 @@
table, and a database?
</H4>
<P>
These are the limits:
</P>
<
CEN
TE
R
>
<
BLOCKQUO
TE>
<TABLE
BORDER=
1
>
<TR><TD>
Maximum size for a database?
</TD><TD>
unlimited (32 TB databases
exist)
</TD></TR>
...
...
@@ -685,8 +671,7 @@ on column types</TD></TR>
<TR><TD>
Maximum number of indexes on a
table?
</TD><TD>
unlimited
</TD></TR>
</TABLE>
</CENTER>
<BR>
</BLOCKQUOTE>
<P>
Of course, these are not actually unlimited, but limited to
available disk space and memory/swap space. Performance may suffer
...
...
@@ -837,7 +822,7 @@ table?</TD><TD>unlimited</TD></TR>
<H4><A
name=
"4.10"
>
4.10
</A>
) What is the difference between the
various character types?
</H4>
<
CEN
TE
R
>
<
BLOCKQUO
TE>
<TABLE
BORDER=
1
>
<TR><TH>
Type
</TH><TH>
Internal Name
</TH><TH>
Notes
</TH></TR>
<TR><TD>
VARCHAR(n)
</TD><TD>
varchar
</TD><TD>
size specifies maximum
...
...
@@ -850,7 +835,8 @@ length</TD></TR>
(null-byte safe)
</TD></TR>
<TR><TD>
"char"
</TD><TD>
char
</TD><TD>
one character
</TD></TR>
</TABLE>
</CENTER>
</BLOCKQUOTE>
<P>
You will see the internal name when examining system catalogs
and in some error messages.
</P>
...
...
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