diff options
Diffstat (limited to 'doc/src/sgml/ref')
| -rw-r--r-- | doc/src/sgml/ref/alter_table.sgml | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml index 6bc5ac54459..2d87902b2f4 100644 --- a/doc/src/sgml/ref/alter_table.sgml +++ b/doc/src/sgml/ref/alter_table.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.38 2002/02/17 13:29:00 momjian Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.39 2002/03/05 05:33:04 momjian Exp $ PostgreSQL documentation --> @@ -31,6 +31,8 @@ ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ] ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ] ALTER [ COLUMN ] <replaceable class="PARAMETER">column</replaceable> SET STATISTICS <replaceable class="PARAMETER">integer</replaceable> ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ] + ALTER [ COLUMN ] <replaceable class="PARAMETER">column</replaceable> SET STORAGE {PLAIN | EXTERNAL | EXTENDED | MAIN} +ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ] RENAME [ COLUMN ] <replaceable class="PARAMETER">column</replaceable> TO <replaceable class="PARAMETER">newcolumn</replaceable> ALTER TABLE <replaceable class="PARAMETER">table</replaceable> @@ -169,6 +171,17 @@ ALTER TABLE <replaceable class="PARAMETER">table</replaceable> The <literal>ALTER COLUMN SET STATISTICS</literal> form allows you to set the statistics-gathering target for subsequent <xref linkend="sql-analyze" endterm="sql-analyze-title"> operations. + The <literal>ALTER COLUMN SET STORAGE</literal> form allows the + column storage mode to be set. This controls whether this column is + held inline or in a supplementary table, and whether the data + should be compressed or not. <literal>PLAIN</literal> must be used + for fixed-length values such as <literal>INTEGER</literal> and is + inline, uncompressed. <literal>MAIN</literal> is for inline, + compressible data. <literal>EXTERNAL</literal> is for external, + uncompressed data and <literal>EXTENDED</literal> is for external, + compressed data. The use of <literal>EXTERNAL</literal> will make + substring operations on a column faster, at the penalty of + increased storage space. The <literal>RENAME</literal> clause causes the name of a table, column, index, or sequence to change without changing any of the data. The data will remain of the same type and size after the |