While Oracle Database can combine B-trees (via a "bitmap conversion from rowids"), this is relatively expensive. In general to get the same performance as the three bitmaps, you need to place all three columns in a single index. This affects how reusable an index is, which we'll come...
Database log mode Archive Mode Automatic archival Enabled Archive destination /dbaclass06/arch Oldest online log sequence 25626 Next log sequence to archive 25628 Current log sequence 25628 SQL> select destination,STATUS from v$archive_dest where statuS='VALID'; DESTINATION STATUS --- --- /dbaclas...
In general, only application designers using the programming interfaces to Oracle Database are concerned with which types of actions should be grouped together as one transaction. Transactions must be defined properly so that work is accomplished in logical units and data is kept consistent. A transa...
Some tables can have many unique identifiers. A common reason for this is surrogate keys – sequence assigned or GUID values that have no meaning outside of the application. For example you may add anaccount_idcolumn to theaccountstable: Copy code snippet Copied to Clipboard Error: Could not...
How to Best Configure, Size, and Monitor the Oracle Database Fast Recovery Area Presented by: Andy Colvin Principal Consultant, Enkitec October 6, 2011 1 About Me/Enkitec y Who am I? y Principal Consultant at Enkitec y Worked with Oracle dating back to version 7 y What is Enkitec? y ...
Nowadays, we have big data that is large and complex that the traditional databases can’t handle them. There are severalDatabase toolsare available in the marketFor Example,MS-Access, MS SQL Server, SQL Server, Oracle, Oracle Financial, MySQL, PostgreSQL, DB2, Toad, Admirer, etc. These to...
Oracle Edition-Based Redefinition is a powerful feature that can be utilized to have near-zero downtime of the application. Hope you like the article on Edition-Based Redefinition in Oracle Database 11gR2. Please do provide the feedback. If you like this page, please do share it....
some differences may exist. As a preliminary setup before we learn how to add a column to table, install Toad for Oracle, create an instance of Oracle Autonomous Database 19c (or other) and connect to the database instance, all of which is discussed inHow to download Toad for Oracle. ...
Atomicitymeans that each transaction (a sequence of one or more SQL operations) is treated as a unit. When a user purchases an item, money is withdrawn from the user’s account and deposited into the merchant’s account. Atomicity ensures that if the deposit transaction fails, the withdrawal...
1. How to check the consistency the backup , why i am can not see my table ? 2. How to set NBU script when in one box solaris have 3 instance oracle ? for example each instance different oracle home and password and user the oracle owner ...