Archiving and Deletion in PI

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Deletion of XML messages:

XML messages processed by the Integration Engine are saved in the multiple database tables when persisted. XML messages are saved in a hierarchy.  Each XML message has a master entry that contains the most important data, such as the message ID, QualityOfService or date of execution.  This data is also used as search criteria in dynamic searches for XML messages. All additional table entries are attached to this master entry. For each message version, the header and body of the XML message and the message payload are saved in a separate table for each version, along with a version record.

The XML messages are not automatically deleted from the database tables. You can determine whether an XML message is to be archived or deleted, according to the interface. The deletion and archiving jobs are scheduled in cycles using the administration interface.

If a message is to be deleted, the first step is to set the flag Flagged for Deletion in the master entry. The second step is then to delete all dependent table entries.

If a message is to be archived, the first step is to set the flag Flagged for Archiving.  You can then archive all dependent table entries. Finally, you can delete all archived table entries.

Below are two different procedures for deleting XML messages from the database tables:

Simple Deletion Procedure:

The simple deletion procedure deletes all XML messages flagged for deletion or archiving from the database tables in records.

This procedure is recommended when small volumes of XML messages are to be processed by the Integration Engine. However, large data volumes have an adverse effect on performance during the deletion process.  For this reason, the switch procedure is recommended when processing large volumes of messages.

To schedule delete jobs, proceed as follows:

1.        In the Integration Engine ® Administration menu, choose Schedule Delete Jobs.  

 

2.        Select the job(s) to be scheduled.  

 

3.        Specify the start time and date and specify the period you want to use and choose Schedule.  

Check if the deletion and archiving jobs have been carried out.  

Enter transaction SM37 and search for

- SAP_BC_XMB_DELETE_<client> (Deletion job for XML messages)

- SAP_BC_XMB_HIST_DELETE_<client> (Deletion job for history entries)  

Table Switch Procedure:

The switch procedure is based on the fact that an identical table copy exists for each persistence layer table. The copies are shipped by SAP. To begin with, the original tables are the active tables. All XML messages are saved in these tables.

When the deletion job is started, the table entries are not physically deleted from the database tables as in the procedure above, instead the flag Deleted is set in the master entry. The monitors then no longer display this XML message.

When a certain fill level is reached (currently 90% as shown in screen shot below), the deletion job recognizes that a reorganization (or switch) is required. The table copies that were inactive before now become active tables. All new XML messages are written to the table copies. For all existing XML messages, the system checks whether the delete flag in the master entry is set or not.  If it is not set, all corresponding table entries from the original tables are copied to the table copies. Once the all the table entries have been copied, the original tables in the database are deleted and then recreated again immediately.

Set parameter “DROP_MAX_TABLE_LOAD” to determine levels at which Switch procedure is required as shown in screenshot below.

To Activate Table Switch procedures go to transaction SXMB_ADM à Configure Delete Procedure.

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