In Replication Server 15.0, partitioned tables introduced in Adaptive Server® Enterprise 15.0 are replicated in a way that is similar to nonpartitioned tables. The rs_truncate system function in LTL, and the rs_truncate function and function string in Replication Server have been extended to support partitioned tables.
In LTL, the rs_truncate function has been extended to include partition names, as shown in the following syntax:
distribute command_tags applied [owner=owner_name] table.rs_truncate [partition_name, [partition_name]...] yielding
You must assign a partition_name for each partition specified in the truncate table partition command.
In Replication Server, the rs_truncate function has been extended to accept parameters to support a new truncate table paritition command, shown as follows:
truncate table table_name partition partition_name
When a truncate partition command is issued, the RepAgent sends the following LTL:
applied [owner=owner_name] table_name.rs_truncate, partition_name _yd
The partition names are passed as parameters to the rs_truncate function. The rs_truncate function string accepts position-based function-string parameters. The following is a position-based variable that specifies the parameter position in the function, in the LTL command:
?n!param?
A sample function string for rs_truncate with the position-based variable is as follows:
truncate table publishers partition ?1!param?, ?2!param?
Example 1 To replicate truncate table partition as a delete command, alter the function string in the following way:
alter function string publisher.rs_truncate for rs_sqlserver_function_class output language 'begin transaction if (?1!param? = '''') /* NO parameter */ delete publisher if (?1!param? = ''A'') delete publishers where c1 < 1000 if (?1!param? = ''B'') delete publishers where c1 >= 1000 commit transaction'
Example 2 : To not to truncate table partitions at the replicate server, alter the function string to do nothing if there is a parameter, in the following way:
alter function string publisher.rs_truncate for rs_sqlserver_function_class output language 'if (?1!param? = '''') delete publisher'
For the RepAgent to send an rs_truncate applied subcommand with parameters, the site version must be 15.0 and the LTL version must be 700. If the LTL version is below 700, RepAgent skips the rs_truncate portion of the distribute command.
To replicate the rs_truncate function with a parameter to the replicate Replication Server, the route version must be 1500. If the route version is lower than 1500, the rs_truncate command with the parameter is skipped.
