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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
877e2963
Commit
877e2963
authored
Jun 07, 2006
by
Bruce Momjian
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Spelling fix.
Robert Treat
parent
9ca4c153
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doc/FAQ
View file @
877e2963
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)
...
...
@@ -519,7 +519,7 @@
One limitation is that indexes can not be created on columns longer
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 fun
c
tion index of an MD5
hash of the long column, and full text indexing allows for searching
of words within the column.
...
...
@@ -620,8 +620,8 @@
FROM tab
WHERE lower(col) = 'abc';
This will not use an standard index. However, if you create a
express
s
ion index, it will be used:
This will not use an standard index. However, if you create a
n
expression index, it will be used:
CREATE INDEX tabindex ON tab (lower(col));
If the above index is created as UNIQUE, though the column can store
...
...
@@ -726,7 +726,7 @@
4.12) What is an OID? What is a CTID?
Every row that is created in PostgreSQL gets a unique OID unless
created WITHOUT OIDS. OIDs are auto
to
matically assigned unique 4-byte
created WITHOUT OIDS. OIDs are automatically assigned unique 4-byte
integers that are unique across the entire installation. However, they
overflow at 4 billion, and then the OIDs start being duplicated.
PostgreSQL uses OIDs to link its internal system tables together.
...
...
doc/src/FAQ/FAQ.html
View file @
877e2963
...
...
@@ -10,7 +10,7 @@
alink=
"#0000ff"
>
<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=
"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
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 fun
c
tion index
of an MD5 hash of the long column, and full text indexing
allows for searching of words within the column.
</P>
...
...
@@ -812,8 +812,8 @@ table?</TD><TD>unlimited</TD></TR>
FROM tab
WHERE lower(col) = 'abc';
</PRE>
This will not use an standard index. However, if you create a
express
s
ion index, it will be used:
This will not use an standard index. However, if you create a
n
expression index, it will be used:
<PRE>
CREATE INDEX tabindex ON tab (lower(col));
</PRE>
...
...
@@ -957,7 +957,7 @@ length</TD></TR>
<P>
Every row that is created in PostgreSQL gets a unique
<SMALL>
OID
</SMALL>
unless created
<SMALL>
WITHOUT OIDS
</SMALL>
.
O
<SMALL>
ID
</SMALL>
s are auto
to
matically assigned unique 4-byte
O
<SMALL>
ID
</SMALL>
s are automatically assigned unique 4-byte
integers that are unique across the entire installation. However,
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
...
...
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