This article is the first of a series. In this series, we will discuss all the good things JDBC® 3.0 package has to offer. JDBC API provides a programmatic way of accessing data from Java code. Even though non-relational data can be accessed, the goal of JDBC and the technology revolves around accessing relational data. The JDBC is packaged in the java.sql and javax.sql packages.
If you've been developing applications on Oracle for a while, you've no doubt come across the concept of 'Bind Variables'. Bind variables are one of those Oracle concepts that experts frequently cite as being key to application performance, but it's often not all that easy to pin down exactly what they are and how you need to alter your programming style to use them. With this in mind, I've tried to pull together the key information about bind variables and why they are a 'good thing' when building Oracle applications.
Being an emergency support DBA is a job with huge stress-levels and it always provides a giant adrenaline rush for even the most experienced DBA. Senior management is in a panic, and high-level executives are continuously asking for a status update. Most of these databases are brand-new to me, and I have only a few minutes to access the situation and devise a plan to quickly relieve their bottleneck.
With the recent release of Oracle Database 10g, OTN have recently been running a series of articles by Arup Nanda entitled "Oracle Database 10g: The Top 20 Features for DBAs".
With this in mind, I thought it worth putting something similar but this time focusing on those features that apply to Data Warehousing and Business Intelligence. So here's my Top 10...
It is the business that has the knowledge about their entities (things of importance) and what kind of unique information that separate them (invoice numbers, customer IDs, and so on).
Your role as an analyst/designer is to validate such properties, and to fit them into a normalized database model that reflects the needs of the business.
In this article, we discuss the different ways in which Java can communicate with a database. We will talk about the traditional different kinds of drivers and also discuss some code to connect to a database in order to run queries.
Oracle Database 10g has expanded the ability to globalize Oracle databases dramatically. As you can see by looking over the following list of globalization improvements, Oracle has attempted to make Database 10g the database of choice for all globally supported and utilized databases.
Many Oracle professional do not realize the important of having good statistics for the Oracle cost-based SQL optimizer (CBO). The CBO has received a "bum-rap" from some Oracle professionals who wonder why the CBO is generating sub-optimal execution plans for their SQL statements.
Oracle databases have many types of auditing features. In mandatory auditing, certain actions are always audited, regardless of the other audit options or parameters. Database activities, such as system startup and shutdown, are always recorded.
SQL tuning is one of the challenging tasks faced by DBAs and developers. It is an interesting and creative, but at the same time, daunting task. Manual tuning of SQL statements requires a high level of expertise and experience to understand and design suitable access paths to yield better response times. It is also a time consuming process. Other challenges include periodic collection of statistics and an ever-changing workload. And in a typical application, there are just too many SQL statements to tune.