To use HDS, install the following components after you have installed Replication Server version 15.1:
Datatype definitions
Replication Server support objects in the replicate database
Replication Server function strings
Class-level translations for non-Sybase datatypes
Datatype definitions assign a unique datatype ID to each datatype, and describe the attributes of each non-Sybase datatype, such as delimiters, length, scale, precision, minimum and maximum values, how it is represented using native Replication Server datatypes. Replication Server uses datatype definitions to:
Identify datatypes
Convert datatypes into native datatypes for internal handling (if necessary)
Translate datatypes
Replication Server relies on a replicate database to maintain some of the operational data that Replication Server needs to replicate to that database.
HDS accommodates the Replication Server replicate database requirements by creating two tables in the replicate database:
rs_info – stores the character set and sort order used by the database. The Replication Server maintenance user ID must have select permission on this table.
rs_lastcommit – is used by the replicate Replication Server to record information about the most recent replicated operations committed in the replicate database. Because this table is both read and updated by the replicate Replication Server, the Replication Server maintenance user ID must have both insert and update permission on this table.
Function strings allow users to customize the database operations sent by the replicate Replication Server to the replicate database. HDS uses function strings to replace invocations of stored procedures and certain database commands that the replicate Replication Server sends to the replicate database.
The function strings required to support HDS are installed in the RSSD of the replicate Replication Server. Sample scripts are provided for this purpose.
HDS provides default datatype-to-datatype mappings, called class-level translations.
HDS provides a function-string class for each supported database server. The class-level translations are specific to each function-string class that supports a non-Sybase replicate database.
