Columns Tab - Oracle Application Server 10.1.3.4 User Manual

Table A–1 (Cont.) General Tab Components
Field
Organization
Record format
Maximum record
length
DB Command
Filter Expression

Columns Tab

Use the Columns tab to specify metadata that describe the table columns. The tab is
divided into the following:
Column Definition Section
■
Column Properties
■
The Columns tab is shown in the following figure:
Description
Select how the record represented by the table is
organized. The options that are displayed depend on the
record. The following options are available:
Index
■
Sequential
■
Relative: Used with RRDS files. Access to a specific
■
record number of a relative file is performed by using
a pseudo column to specify the record position. The
hash symbol (#) is used to specify a pseudo column.
For example:
SELECT * FROM colleges WHERE # = 6
Specifies how the record, represented by the table, is
formatted. The options that are displayed depend on the
record. The IMS/DB records have a fixed format.
The maximum allowable size of a record (in bytes).
IMS/DB specific commands are displayed in the DB
Command section of the General tab. The information
displayed is generated automatically when the metadata is
generated and should not be modified.
A WHERE clause. This clause is added to every query
accessed using this metadata. The filter is specified
without the WHERE keyword. Specify a filter when more
than one logical table is stored in the same physical file.
Metadata for the IMS/DB Data Source
Advanced Tuning of the Metadata A-3