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May 18, 2001 · Tom: I read you section on function based indexes and got the impression that by creating an index on a user-defined function I may be able to improve the speed of a query except I do not see how it happens.
When DML changes are made to master table data, Oracle Database stores rows describing those changes in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table.
What Is the Redo Log? The most crucial structure for recovery operations is the redo log, which consists of two or more preallocated files that store all changes made to the database as they occur.Every instance of an Oracle Database has an associated redo log …
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We've a table with a varchar2(100) column, that occasionally contains carriage-return & line-feeds. We should like to remove those characters in the SQL query. We're using: REPLACE( col_name, CHR(10) ) which has no effect, however replacing 'CHR(10)' for a more conventional 'letter' character proves that the REPLACE function works otherwise.We have also found that
An Oracle DATE does not store times with more precision than a second. You cannot store millisecond precision data in a DATE column.. Your two options are to either truncate the string of the milliseconds before converting it into a DATE, i.e. . to_date( substr('23.12.2011 13:01:001', 1, …
This Oracle tutorial explains how to use the Oracle / PLSQL CONCAT function with syntax and examples. The Oracle / PLSQL CONCAT function allows you to concatenate two strings together.
This Oracle tutorial explains how to use the Oracle / PLSQL REGEXP_SUBSTR function with syntax and examples. This function, introduced in Oracle 11g, will allow you to extract a substring from a string using regular expression pattern matching.