Rule Definition
A query that retrieves all columns of a table with a SELECT * can potentially be the source of important changeability problems. One cannot control how the columns will be ordered and returned to the client. This can lead to important data inconsistencies and thus stability issues.
Also performance problems may arise when the execution of the query returns a large result sets (many row with all the columns may then become a huge amount of data to transport over the network). Thus optimizer module can't provide a correct execution.
Remediation
Review the design of the query to select only useful Columns
Related Technologies
DB2 Server
Forms
Visual Basic
.Net
Cobol
PL/SQL
JEE
Microsoft T-SQL
Sybase T-SQL
DB2 z/OS
SHELL
SQLScript
Technical Criterion
Efficiency - SQL and Data Handling Performance
About CAST Appmarq
CAST Appmarq is by far the biggest repository of data about real IT systems. It's built on thousands of analyzed applications, made of 35 different technologies, by over 300 business organizations across major verticals. It provides IT Leaders with factual key analytics to let them know if their applications are on track.