Datacom data compression without Presspack

Products

• Datacom/DB
• Datacom
• DATACOM - AD
• Datacom/AD

Issue/Introduction

Can data compression be done in Datacom without Presspack?

Is Datacom Presspack required for data compression? 

Environment

Release: 15.1

 

Resolution

Datacom Presspack offers the best data compression but requires a separate license. 

There are three types of compression that can be used in Datacom:

• Datacom Presspack
  
  
• Datacom/DB data compression 
  
  
• a User Compression Exit 

Data compression can be done without Datacom Presspack, using the standard Datacom/DB data compression or a User Compression Exit.

The standard Datacom/DB data compression does basic compression, it removes three or more consecutive blanks, character zeros or binary zeros.

To turn on standard Datacom/DB data compression perform the following:

• DBUTLTY BACKUP the area
• set the COMPRESSION attribute to Y for the table in datadictionary. 
• CATALOG the database
• DBUTLTY LOAD the area

For large areas Table Alter 24x7 (TA24) can also be used  to implement compression instead of the above BACKUP/LOAD process.

Additional Information

See documentation sections Data Compression, TABLE Attribute-Types and Table Alter 24x7.