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Oracle - Page 3

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How To Improve Your Tablespaces
by Carlos Alvarez
The following technique will allow you to free your tablespaces from Oracle
Use Of 'Connect By' clause for Hierarchal Query
by Trupti Rajparia
The Connect By clause is useful for tables which have 2 or more columns with parent-child relationships. While displaying rows, we can use 'LEVEL' pseudo column to indent the results as hierarchy.
Code to Send E-Mails from an Oracle Stored Procedure
by Jose Antonio
The following code (based on the UTL_SMTP package supplied in Oracle8i V8.1.6, ...
Use Decode Function for Oracle Queries
by Trupti Rajparia
Decode is a very useful and handy function for Oracle queries. ...
Showing Rows of a Table in Columns Format
by Jatin Shah
Sometimes in our database structures we've got to store information in such a ...
Using ROWNUM Pseudocolumn in Oracle
by Trupti Rajparia
When querying in Oracle, use ROWNUM pseudocolumn to limit the number of returned rows. Pseudocolumns behave like table columns but are not actually stored in tables. (Other pseudocolumns are RowId, ...
SubQueries in the FROM Clause of SELECT
by Trupti Rajparia
When a SubQuery is used in a FROM clause instead of a Table name, Oracle ...
Optimize Oracle's SQL Statement Cache
by Andrew Holliday
When Oracle receives a SQL statement to execute, it first looks to see ...
Determining Your Session IDs for SQL Server and Oracle
by Andrew Holliday
If you work with SQL Server or Oracle you at some point probably will need ...
Roles Are Disabled at Package Compilation Time
by Trupti Rajparia
When granting permissions through roles, it is important to know that ...
Dynamic SQL in Oracle 8i
by Andrew Holliday
Oracle 8I gives developers a new feature to allow execution of native dynamic SQL. This is an alternative to the DBMS_SQL package previously required. Now developers can use dynamic SQL in their ...
Using Temp Tables in Oracle 8i
by Andrew Holliday
Oracle 8i introduces the concept of temp tables. This feature long since enjoyed by SQL Server developers enables data to be visible on a Session ...
Quickly Comment and Uncomment Blocks of Code in SQL
by Don Benson
During development, it is often necessary to have blocks of code for ...
Wrapping Application Code
by Jayanta Sengupta
Oracle comes with a PL/SQL wrapper, which converts the PL/SQL source code into an intermediate form of object code. By hiding application internals, the wrapper prevents the misuse of your code by ...
Avoid Multiple Exit Points in a Function
by Jayanta Sengupta
If you have a database function that has multiple return statements, try to minimize the exit points. I will explain with the following ...
Caching Packages on Database Startup
by Jayanta Sengupta
Oracle8i has introduced database-level and system-level triggers. They can track events in the database such as logon/logoff from a schema, startup and shutdown of a database, and response to a ...
Performance Analysis of Application by Code Profiling
by Jayanta Sengupta
Oracle8i provides a standard package, DBMS_PROFILER, which facilitates performance and code coverage analysis of your PL/SQL application. This package provides functions for gathering statistics, ...
Performance Enhancements Using Temporary Tables
by Jayanta Sengupta
A temporary table has a definition or structure like that of a regular table, but the data it contains exists for only the duration of a transaction or session. Oracle8i allows you to create ...
Advantages of EXISTS over IN Clause in a Query
by Jayanta Sengupta
If you wish to retrieve from the department table all the department numbers that have at least one employee assigned to them, write the query ...
Faster Data Access Using Index-Organized Tables
by Jayanta Sengupta
If you have a table whose columns always are queried together, maybe you should store them as an index-organized table (IOT). An IOT is indexed on one or more columns and all the table data is ...
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