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Remove pgsql_tmp directory FAQ item.

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Bruce Momjian 2005-02-02 13:41:18 +00:00
parent 73f630500b
commit cde6056e34
2 changed files with 21 additions and 47 deletions
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doc/FAQ
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@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Feb 1 16:10:47 EST 2005 Last updated: Wed Feb 2 08:40:42 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) 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? 3.3) How do I tune the database engine for better performance?
3.4) What debugging features are available? 3.4) What debugging features are available?
3.5) Why do I get "Sorry, too many clients" when trying to connect? 3.5) Why do I get "Sorry, too many clients" when trying to connect?
3.6) What is in the pgsql_tmp directory? 3.6) Why do I need to do a dump and restore to upgrade PostgreSQL
3.7) Why do I need to do a dump and restore to upgrade PostgreSQL
releases? releases?
3.8) What computer hardware should I use? 3.7) What computer hardware should I use?
Operational Questions Operational Questions
@ -430,18 +429,7 @@
processes it can start by changing the max_connections value in processes it can start by changing the max_connections value in
postgresql.conf and restarting the postmaster. postgresql.conf and restarting the postmaster.
3.6) What is in the pgsql_tmp directory? 3.6) Why do I need to do a dump and restore to upgrade between major
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
PostgreSQL releases? PostgreSQL releases?
The PostgreSQL team makes only small changes between minor 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 files. A dump outputs data in a generic format that can then be loaded
in using the new internal format. 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 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 all PC hardware is of equal quality. It is not. ECC RAM, SCSI, and
@ -651,12 +639,12 @@
4.10) What is the difference between the various character types? 4.10) What is the difference between the various character types?
Type Internal Name Notes Type Internal Name Notes
VARCHAR(n) varchar size specifies maximum length, no padding VARCHAR(n) varchar size specifies maximum length, no padding
CHAR(n) bpchar blank padded to the specified fixed length CHAR(n) bpchar blank padded to the specified fixed length
TEXT text no specific upper limit on length TEXT text no specific upper limit on length
BYTEA bytea variable-length byte array (null-byte safe) BYTEA bytea variable-length byte array (null-byte safe)
"char" char one character "char" char one character
You will see the internal name when examining system catalogs and in You will see the internal name when examining system catalogs and in
some error messages. some error messages.

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doc/src/FAQ/FAQ.html
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@ -10,7 +10,7 @@
alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Tue Feb 1 16:10:47 EST 2005</P> <P>Last updated: Wed Feb 2 08:40:42 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>) "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="#3.4">3.4</A>) What debugging features are available?<BR>
<A href="#3.5">3.5</A>) Why do I get <I>"Sorry, too many <A href="#3.5">3.5</A>) Why do I get <I>"Sorry, too many
clients"</I> when trying to connect?<BR> clients"</I> when trying to connect?<BR>
<A href="#3.6">3.6</A>) What is in the <I>pgsql_tmp</I> <A href="#3.6">3.6</A>) Why do I need to do a dump and restore
directory?<BR>
<A href="#3.7">3.7</A>) Why do I need to do a dump and restore
to upgrade PostgreSQL releases?<BR> 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> <H2 align="center">Operational Questions</H2>
@ -573,19 +571,7 @@
<I>max_connections</I> value in <I>postgresql.conf</I> and <I>max_connections</I> value in <I>postgresql.conf</I> and
restarting the <I>postmaster</I>.</P> restarting the <I>postmaster</I>.</P>
<H4><A name="3.6">3.6</A>) What is in the <I>pgsql_tmp</I> directory?</H4> <H4><A name="3.6">3.6</A>) Why do I need to do a dump and restore
<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
to upgrade between major PostgreSQL releases?</H4> to upgrade between major PostgreSQL releases?</H4>
<P>The PostgreSQL team makes only small changes between minor releases, <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 data in a generic format that can then be loaded in using the new internal
format.</P> 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 <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 all PC hardware is of equal quality. It is not. ECC RAM, SCSI, and
@ -672,7 +658,7 @@
table, and a database?</H4> table, and a database?</H4>
<P>These are the limits:</P> <P>These are the limits:</P>
<CENTER> <BLOCKQUOTE>
<TABLE BORDER=1> <TABLE BORDER=1>
<TR><TD>Maximum size for a database?</TD><TD>unlimited (32 TB databases <TR><TD>Maximum size for a database?</TD><TD>unlimited (32 TB databases
exist)</TD></TR> exist)</TD></TR>
@ -685,8 +671,7 @@ on column types</TD></TR>
<TR><TD>Maximum number of indexes on a <TR><TD>Maximum number of indexes on a
table?</TD><TD>unlimited</TD></TR> table?</TD><TD>unlimited</TD></TR>
</TABLE> </TABLE>
</CENTER> </BLOCKQUOTE>
<BR>
<P>Of course, these are not actually unlimited, but limited to <P>Of course, these are not actually unlimited, but limited to
available disk space and memory/swap space. Performance may suffer 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 <H4><A name="4.10">4.10</A>) What is the difference between the
various character types?</H4> various character types?</H4>
<CENTER> <BLOCKQUOTE>
<TABLE BORDER=1> <TABLE BORDER=1>
<TR><TH>Type</TH><TH>Internal Name</TH><TH>Notes</TH></TR> <TR><TH>Type</TH><TH>Internal Name</TH><TH>Notes</TH></TR>
<TR><TD>VARCHAR(n)</TD><TD>varchar</TD><TD>size specifies maximum <TR><TD>VARCHAR(n)</TD><TD>varchar</TD><TD>size specifies maximum
@ -850,7 +835,8 @@ length</TD></TR>
(null-byte safe)</TD></TR> (null-byte safe)</TD></TR>
<TR><TD>"char"</TD><TD>char</TD><TD>one character</TD></TR> <TR><TD>"char"</TD><TD>char</TD><TD>one character</TD></TR>
</TABLE> </TABLE>
</CENTER> </BLOCKQUOTE>
<P>You will see the internal name when examining system catalogs <P>You will see the internal name when examining system catalogs
and in some error messages.</P> and in some error messages.</P>