Month: December 2018

SQL Cheat sheet

SQL Cheat sheet: After following this SQL Cheat sheet we will be in a position to understand quickly and use SQL statement as per requirements.  Below are the SQL commands Cheat sheet mentioned which perform different kinds of operations. Various SQL types: DRL, DDL, DML, TCL, DCL  DESCRIPTION select syntax: DRL: DATA RETRIEVAL LANGUAGE COMMANDS …

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oracle performance tuning 12c

oracle performance tuning 12c SQL Tuning The main objective of “Oracle performance tuning”, “SQL tuning” is to avoid performing unnecessary work to access rows that do not affect the result. Scenarios: If a table has huge data, and some SQL queries are taking so much time to execute, what could be the reason? How to tune that query? 1. …

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SQL*Loader

SQL*Loader: SQL Loader is an Oracle database utility, used for data loading from flat-files into the database table. Files used in SQL* Loder are Data_file, Control file, Bad_file, Doscard_file, Log_file.    Data Source: It can be a flat file(data_file) / stdin(standard input) -> file redirect in command prompt while executing sqlldr.    Control file: It gives …

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Oracle Data Redaction

Oracle Data Redaction Oracle Database 12c introduced a new feature related to Advanced Security option which enables the protection of data shown to the user in real-time, without requiring changes to the application. The feature is called Data-redaction. During Data redaction the stored data remain unchanged, while the data to be displayed is transformed on-the-fly before …

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DBMS_REDACT API parameters

DBMS_REDACT API parameters: NameDatatype Value Description Add Policy NONEBINARY_INTEGER 0 No redaction, zero effect on the result of a query against table. FULLBINARY_INTEGER 1 Full redaction, redacts full values of the column data. PARTIALBINARY_INTEGER 2 Partial redaction, redacts a portion of the column data. FORMAT_PRESERVING BINARY_INTEGER 3 Format Preserving RANDOMBINARY_INTEGER 4 Random redaction, each query …

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