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Commit877e296

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Spelling fix.
Robert Treat
1 parent9ca4c15 commit877e296

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‎doc/FAQ‎

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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated:Sat Jun3 20:17:01 EDT 2006
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Last updated:Wed Jun717:22:48 EDT 2006
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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One limitation is that indexes can not be created on columns longer
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than about 2,000 characters. Fortunately, such indexes are rarely
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needed. Uniqueness is best guaranteed by afuntion index of an MD5
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needed. Uniqueness is best guaranteed by afunction index of an MD5
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hash of the long column, and full text indexing allows for searching
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of words within the column.
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FROM tab
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WHERE lower(col) = 'abc';
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This will not use an standard index. However, if you createa
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expresssion index, it will be used:
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This will not use an standard index. However, if you createan
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expression index, it will be used:
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CREATE INDEX tabindex ON tab (lower(col));
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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?
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Every row that is created in PostgreSQL gets a unique OID unless
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created WITHOUT OIDS. OIDs areautotomatically assigned unique 4-byte
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created WITHOUT OIDS. OIDs areautomatically assigned unique 4-byte
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integers that are unique across the entire installation. However, they
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overflow at 4 billion, and then the OIDs start being duplicated.
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PostgreSQL uses OIDs to link its internal system tables together.

‎doc/src/FAQ/FAQ.html‎

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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated:Sat Jun3 20:17:01 EDT 2006</P>
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<P>Last updated:Wed Jun717:22:48 EDT 2006</P>
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<P>Current maintainer: Bruce Momjian (<Ahref=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
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<P>One limitation is that indexes can not be created on columns
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longer than about 2,000 characters. Fortunately, such indexes are
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rarely needed. Uniqueness is best guaranteed by afuntion index
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rarely needed. Uniqueness is best guaranteed by afunction index
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of an MD5 hash of the long column, and full text indexing
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allows for searching of words within the column.</P>
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FROM tab
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WHERE lower(col) = 'abc';
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</PRE>
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This will not use an standard index. However, if you createa
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expresssion index, it will be used:
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This will not use an standard index. However, if you createan
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expression index, it will be used:
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<PRE>
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CREATE INDEX tabindex ON tab (lower(col));
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</PRE>
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<P>Every row that is created in PostgreSQL gets a unique
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<SMALL>OID</SMALL> unless created<SMALL>WITHOUT OIDS</SMALL>.
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O<SMALL>ID</SMALL>s areautotomatically assigned unique 4-byte
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O<SMALL>ID</SMALL>s areautomatically assigned unique 4-byte
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integers that are unique across the entire installation. However,
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they overflow at 4 billion, and then the O<SMALL>ID</SMALL>s start
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being duplicated. PostgreSQL uses<SMALL>OID</SMALL>s to link its

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