Calling PL/SQL Functions From SQL

Isn't it great how you "extend" Oracle SQL by calling your own user-defined PL/SQL functions from within SQL statements? Yes, it really is nice, but there are things you need to know about and take into consideration, from read-consistency to optimizer nuances. Chris Saxon gave an overview of the key issues from performance to correctness. Highlights include: 03:30 - performance comparison of plain SQL vs. calling PL/SQL function 04:30 - SQL to PL/SQL context switches; what they are and how they affect performance 06:10 - Techniques to make calling PL/SQL from SQL faster: scalar subquery caching, deterministic keyword, function result cache, pragma UDF 14:00 - Performance comparison of these options 21:20 - Performance comparison when calling non-deterministic functions 35:30 - The danger when you have SQL that calls PL/SQL that calls SQL 41:30 - Calling PL/SQL in SQL dos and don'ts AskTOM Office Hours offers free, monthly training and tips on how to make the most of Oracle Database, from Oracle product managers, developers and evangelists. https://asktom.oracle.com/ Oracle Developers portal: https://developer.oracle.com/ Sign up for an Oracle Cloud trial: https://cloud.oracle.com/en_US/tryit