Sometimes it's good to re-think how to write a query; set operations can provide performance benefits over 'straight SQL'. In this article, David Fitzjarrell takes a look at one such example in action.
2016-05-25
3,710 reads
Oracle offers a number of security-related settings, but one could definitely create more harm than good. David Fitzjarrell looks at which parameter that is, and why.
2016-03-24
5,227 reads
Defining unique records in an Oracle table is necessary for employee data, and manufacturing part numbers and user names, to name a couple of examples. David Fitzjarrell looks at the various ways uniqueness can be defined, and which method may not be acceptable to third-party applications.
2016-02-26
386 reads
Oracle 12.1.0.2 can throw an ORA-01438 when importing an interval partitioned table. In this post, David Fitzjarrell suggests a work-around until Oracle patches the bug.
2015-12-25
3,295 reads
David Fitzjarrell looks at how and why to use a feature called Automatic Column Group Detection to recognize column dependencies and create extended statistics on recognized groups in Oracle 12.1.0.2.
2015-11-11
3,177 reads
Oracle offers a results cache in the database (from 11.2 onwards) and in PL/SQL (again, from 11.2 onwards) which can greatly reduce execution time of repeated statements when insert/update/delete activity is not heavy. The mechanism in PL/SQL, however, may not work as expected with global temporary tables. Using a slightly modified example, Jonathan Lewis looks at what you might see when using this option.
2015-10-22
4,120 reads
Automatic UNDO Management isn't voodoo or black magic, although it can seem that way when it isn't clearly understood. How does Oracle decide how many UNDO segments to create at startup, and what is the underlying goal of the process? David Fitzjarrell investigates.
2015-10-06
3,322 reads
Designing a system with primary keys in mind is not an easy task, and the solutions may not be the simplest. However the effort is well worth the time and trouble when you realize that it's the best way to prevent duplicate data - but how do you choose a primary key? David Fitzjarrell looks at several examples.
2015-08-25
4,312 reads
In this tip, Daniel Calbimonte compares the SQL Server (T-SQL) and Oracle (PL-SQL) extensions of the SQL language. The tip will compare both T-SQL and PL-SQL languages with respect to retrieving data, creating databases, tables, variables, etc.
2015-06-22
4,457 reads
On January 28th 3PM GMT, Randolf Geist will present a free, one-hour webinar analyzing different database query profiles based on a real-world customer case. He'll also look at how these different profiles influence the efficiency of Exadata's features and the new Oracle In-Memory column store option. Register now.
2015-01-23
8,371 reads
By Steve Jones
What topics do you want to see presented at a future SQL Saturday (or...
By Steve Jones
I recently had an issue in one of my Git repos, and decided to...
By James Serra
I’ve collaborated with two industry experts to design a transformative course for data leaders:...
Comments posted to this topic are about the item 7 sept, scheduled book
Comments posted to this topic are about the item 7 sept, schedlued article
Comments posted to this topic are about the item 6 sept, published book
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