Create Work Table FAQS

1. What is the purpose of the "Create Work Table" task?
•  The Create Work Table task is responsible for creating a loading table in the target database. This temporary table is used to hold the data extracted from the source system before it is transformed and loaded into the final target tables.
2. When is the "Create Work Table" task executed?
•  This task is executed at the beginning of the loading phase. It prepares the loading table that will temporarily hold the data during the integration process.
3. What happens if the loading table already exists?
•  The Create Work Table task will fail if the loading table already exists. However, depending on the specific Knowledge Module (KM) being used, the table might be dropped and recreated, or an error might occur.
4. How is the table name generated in the "Create Work Table" task?
•  The table name is dynamically generated using the getTable method and the COLL_NAME property. This allows the system to correctly reference the table based on the mapping context.

<%=snpRef.getTable("L", "COLL_NAME", "A")%>

• This generates the table name dynamically, based on the collection name (COLL_NAME).
4. How is the column structure of the loading table defined?
•  The column structure of the loading table is dynamically generated using the getColList method, which includes the column names and their data types. This method ensures that the correct attributes are included in the table, including any write date or nullable columns, as specified.

<%=snpRef.getColList("", "[CX_COL_NAME]\t[DEST_WRI_DT] " + snpRef.getInfo("DEST_DDL_NULL"), ",\n\t", "","")%>

6. Can I modify the column structure in the "Create Work Table" task?
•  Yes, you can modify the column structure by editing the Knowledge Module or the column definitions in ODI Studio. The column names, data types, and other properties can be customized based on your specific requirements.
7. What is the significance of the DEST_WRI_DT field?
•  The DEST_WRI_DT field typically represents the write date or a timestamp that tracks when the data was loaded into the staging area. This field helps to maintain historical data or track when the data integration occurred.
8. What is the DEST_DDL_NULL parameter used for?
•  The DEST_DDL_NULL parameter defines whether the columns in the loading table should allow NULL values. This ensures that the column definitions are aligned with the target database’s requirements.
9. Can I change the table structure after the "Create Work Table" task has executed?
•  Modifying the table structure after the task executes may cause inconsistencies in the data flow. Any changes should be made in the Knowledge Module or before running the integration process.
10. What command is executed to create the loading table?
•  The task generates a CREATE TABLE SQL command, which is dynamically constructed based on the table name and column structure:

create table <%=snpRef.getTable("L", "COLL_NAME", "A")%> (

  <%=snpRef.getColList("", "[CX_COL_NAME]\t[DEST_WRI_DT] " + snpRef.getInfo("DEST_DDL_NULL"), ",\n\t", "","")%>

)