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Spelling fix. 

Robert Treat
This commit is contained in:
Bruce Momjian 2006-06-07 21:23:01 +00:00
parent 9ca4c153bf
commit 877e296306
2 changed files with 10 additions and 10 deletions
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sat Jun 3 20:17:01 EDT 2006 Last updated: Wed Jun 7 17:22:48 EDT 2006
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -519,7 +519,7 @@
One limitation is that indexes can not be created on columns longer One limitation is that indexes can not be created on columns longer
than about 2,000 characters. Fortunately, such indexes are rarely than about 2,000 characters. Fortunately, such indexes are rarely
needed. Uniqueness is best guaranteed by a funtion index of an MD5 needed. Uniqueness is best guaranteed by a function index of an MD5
hash of the long column, and full text indexing allows for searching hash of the long column, and full text indexing allows for searching
of words within the column. of words within the column.
@ -620,8 +620,8 @@
FROM tab FROM tab
WHERE lower(col) = 'abc'; WHERE lower(col) = 'abc';
This will not use an standard index. However, if you create a This will not use an standard index. However, if you create an
expresssion index, it will be used: expression index, it will be used:
CREATE INDEX tabindex ON tab (lower(col)); CREATE INDEX tabindex ON tab (lower(col));
If the above index is created as UNIQUE, though the column can store If the above index is created as UNIQUE, though the column can store
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4.12) What is an OID? What is a CTID? 4.12) What is an OID? What is a CTID?
Every row that is created in PostgreSQL gets a unique OID unless Every row that is created in PostgreSQL gets a unique OID unless
created WITHOUT OIDS. OIDs are autotomatically assigned unique 4-byte created WITHOUT OIDS. OIDs are automatically assigned unique 4-byte
integers that are unique across the entire installation. However, they integers that are unique across the entire installation. However, they
overflow at 4 billion, and then the OIDs start being duplicated. overflow at 4 billion, and then the OIDs start being duplicated.
PostgreSQL uses OIDs to link its internal system tables together. PostgreSQL uses OIDs to link its internal system tables together.

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doc/src/FAQ/FAQ.html
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alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sat Jun 3 20:17:01 EDT 2006</P> <P>Last updated: Wed Jun 7 17:22:48 EDT 2006</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>)
@ -694,7 +694,7 @@ table?</TD><TD>unlimited</TD></TR>
<P>One limitation is that indexes can not be created on columns <P>One limitation is that indexes can not be created on columns
longer than about 2,000 characters. Fortunately, such indexes are longer than about 2,000 characters. Fortunately, such indexes are
rarely needed. Uniqueness is best guaranteed by a funtion index rarely needed. Uniqueness is best guaranteed by a function index
of an MD5 hash of the long column, and full text indexing of an MD5 hash of the long column, and full text indexing
allows for searching of words within the column.</P> allows for searching of words within the column.</P>
@ -812,8 +812,8 @@ table?</TD><TD>unlimited</TD></TR>
FROM tab FROM tab
WHERE lower(col) = 'abc'; WHERE lower(col) = 'abc';
</PRE> </PRE>
This will not use an standard index. However, if you create a This will not use an standard index. However, if you create an
expresssion index, it will be used: expression index, it will be used:
<PRE> <PRE>
CREATE INDEX tabindex ON tab (lower(col)); CREATE INDEX tabindex ON tab (lower(col));
</PRE> </PRE>
@ -957,7 +957,7 @@ length</TD></TR>
<P>Every row that is created in PostgreSQL gets a unique <P>Every row that is created in PostgreSQL gets a unique
<SMALL>OID</SMALL> unless created <SMALL>WITHOUT OIDS</SMALL>. <SMALL>OID</SMALL> unless created <SMALL>WITHOUT OIDS</SMALL>.
O<SMALL>ID</SMALL>s are autotomatically assigned unique 4-byte O<SMALL>ID</SMALL>s are automatically assigned unique 4-byte
integers that are unique across the entire installation. However, integers that are unique across the entire installation. However,
they overflow at 4 billion, and then the O<SMALL>ID</SMALL>s start they overflow at 4 billion, and then the O<SMALL>ID</SMALL>s start
being duplicated. PostgreSQL uses <SMALL>OID</SMALL>s to link its being duplicated. PostgreSQL uses <SMALL>OID</SMALL>s to link its