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Converting COBOL Data to SQL Data: GDT-ETL Part 1

Converting COBOL Data to SQL Data: GDT-ETL Part 1. GDT ETL. What is ETL? Extract Transform Load Extract data from your legacy system. Transform (Convert or cleanse). Load the data into the relational database, data warehouse, data mart or Operational Data Store. Why GDT-ETL?

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Converting COBOL Data to SQL Data: GDT-ETL Part 1

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  1. Converting COBOL Data to SQL Data: GDT-ETL Part 1

  2. GDT ETL • What is ETL? • Extract Transform Load • Extract data from your legacy system. • Transform (Convert or cleanse). • Load the data into the relational database, data warehouse, data mart or Operational Data Store. • Why GDT-ETL? • Built for Legacy Systems. • Native access to ISAM data. • Transformation from COBOL data types to more general types. • Allows you to focus on where the data is going not how you get access to it.

  3. GDT ETL • Data flow for a system running GDT • MF file system to a relational database MF Files GDT-ETL GDT-ETL RDMS RDMS GDT

  4. GDT ETL • Data flow for Legacy Systems UFAS MF Files Fileconv2 RDMS RDMS Fileconv2 GDT-ETL GDT-ETL GCOS GDT

  5. GDT ETL • ETL Features • Command line tool and now with a Graphical User Interface (to be shown) • Object Oriented Design. • Will work on Windows or UNIX platforms. • Comprehensive error logging and process monitoring. • Will work with existing enterprise scheduling facilities. • ETL Requirements • Windows • GDT V4.1 • .NET Framework 2.0 • Solaris • GDT V4.1

  6. What can I do with GDT-ETL? • There are two main features of this tool. • Help build database schemas from your ISAM data. • Creating Data marts • Data warehouse • Data Stores • Loading data into a database system.

  7. GDT ETLA Working Example! ICOM system

  8. SQL1GEN process • GDT process that generates a File Access Component (GDTFAC.DLL) • To be used by GDT ETL to generically access all Micro Focus ISAM files • Configuration • SQLCONV.PAR • FILE DEFINITION(S) fd’s • FILE SELECT STATEMENTS • MULTIPLE 01 RECORD DEFINITION PARAMETER FILES • Requires GDT V4.1  • GDTFAC.DLL contains all necessary file info. • Key information, data types, record types, fields etc..

  9. A Typical Production Environment ISAM Order Master File Customer Data Batch process Report Data Report Generation

  10. Using the ORDERS file FILE DEFINITION SQL1GEN PLUS FILE COBOL Select statement PLUS GDTSQL Parameter File ------------------------------------------------------------------------------------------- Creates GDTFAC.DLL

  11. The ETL process GDTFAC DLL Order Info. File Access Component GDTETL PLUS ------------------------------------------------------------------------------------------- ETL PARAMETER FILE Delete ORDER Master Database Table Create ORDER Master Database Table Load ORDER Master Database Table

  12. Results of the ETL process Data is in the database via the ETL Load

  13. ETL in a nutshell • Step 1: File Analysis • Using the File Access Component built by GDT GDTFAC.DLL, the ETL tool first analyzes the file layout for each file.

  14. ETL in a nutshell • Step 2 - Build the tables and the relationships in SQL • Each record denotes a new table. • Each sub record denotes a new table with a 1 to many relationship with the parent record. • Nested OCCURS within a file produces more relationships. • Each field produces a field in a SQL table and ETL maps COBOL data types to the SQL Servers data types.

  15. ETL in a nutshell • Step 3: • Optional • Modify the table schema and stored procedures to suit your needs. • Build transformations as needed. • Step 4: • Load the Data • Read each file, extract the data, transform from COBOL data types to database server data types and load the data into the database.

  16. GDT ETL IN ACTION • How does ETL build database schemas? • When Generating a table schema GDT-ETL makes the following assumptions. • Each file consists of 1 or more record types. • Each record in a file consists of 1 or more fields and it may contain hierarchy of sub records as denoted by the OCCURS clause. • Each field has a location in a record as well as an associated COBOL data type. • Group name and redefines are ignored.

  17. GDT ETL IN ACTION • Create the database schema and stored procedures. • Build the tables and relationships • Three basic data type transformations: • PIC X(NN) to char(NN) • PIC 9(NN) to INT • PIC S9(NN)V9(NN) to double • Setup default stored procedures for each table: • For each table there are 3 separate stored procedures • Insert • Update (ODS Only) • Delete (ODS Only) • The tables can be modified but the stored procedures must reflect any schema modifications. • The store procedures can be modified but the parameters must stay the same.

  18. GDT ETL IN ACTION • Build the default database objects • Setup the ETL Configuration. • Set database properties. • Reference the location of the file access component. • Build the database objects.

  19. Building Transformations • What value do transformations add? • Allows for cleansing of data before it enters the database. • Determine if it is accurate. • Avoid data corruption. • Create more interesting data transformation • Example: Date time

  20. Building Transformations • Use Data Integration tools • BusinessObjects Data Integrator. • Develop the transformations by hand. • Modify the table layout if desired. • Modify the default stored procedures to setup desired transformations.

  21. ETL in a nutshell • ETL Configuration Utility - GUI • Set the database properties. • Modify which files you want to load. • AND MORE TO COME…..

  22. GDT-ETL • THE DEMONSTRATION!

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