User Guide

SAP AG November 2002
Metadata in UNICODE
The names of the database objects (such as table or column names) can be stored internally
in UNICODE and can therefore then be displayed in the required presentation code in the
database tools.
Application data in UNICODE
SAP DB supports the code attribute UNICODE for the data types CHAR[ACTER], VARCHAR
and LONG[VARCHAR].
See also:
Installing a UNICODE-Enabled Database [Page
91]
Reference Manual: SAP DB 7.4, Code attribute [See SAP DB Library]
Version File
If, during a log backup [Page 142], you use a backup medium [Page 127] that refers to a file,
the content of the log area [Page
142] is copied to files known as “version files.” One version
file is generated for each log segment.
The names of the generated version files consist of the version file name entered during
definition of the backup medium, and a number that the database system assigns in
sequence during backup of the log segments.
Volume
A volume is a logical grouping of physical storage units (disks). A volume can be a part of a
physical disk, a complete physical disk, or a completely structured storage system consisting
of several storage units.
The disks used should have identical performance parameters (specifically access speeds) to
ensure an even filling of the volumes.
If database management tools are used, a volume is addressed via a directory path.
The database system differentiates between data volumes [Page 130] and log volumes [Page
144].
Every database instance [Page 132] has one or more log volumes and data volumes. You
configure the maximum numbers of data and log volumes that are possible when installing
the database instance.
If necessary, you can add data or log volumes to a database instance while the database is
running. Directory paths for data and log volumes can be changed.
Users
See SAP DB user classes [Page 149]
User Manual: SAP DB 153