Sydney Oracle Meetup - indexes

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The document discusses various types of indexes in Oracle databases including B-tree, bitmap, function-based and cluster indexes. It provides details on how each index type works and when they should be used based on factors like cardinality of columns and types of queries. The document also covers monitoring and managing indexes such as rebuilding, coalescing and making them usable or invisible.

Sydney Oracle Meetup - Indexes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Monitoring Index Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Monitoring Space Use of Indexes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Rebuild or Coalesce ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

B-tree indexes ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Index Organised Tables (IOTs) ,[object Object],[object Object],[object Object],[object Object]

Index Organised Tables (IOTs) ,[object Object],[object Object],[object Object]

Bitmap indexes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Bitmap join indexes ,[object Object],[object Object],[object Object]

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The document discusses various techniques for optimizing database performance in Oracle, including: - Using the cost-based optimizer (CBO) to choose the most efficient execution plan based on statistics and hints. - Creating appropriate indexes on columns used in predicates and queries to reduce I/O and sorting. - Applying constraints and coding practices like limiting returned rows to improve query performance. - Tuning SQL statements through techniques like predicate selectivity, removing unnecessary objects, and leveraging indexes.

Part3 Explain the Explain Plan

Maria Colgan

Part 3 of the SQL Tuning workshop examines the different aspects of an execution plan, from cardinality estimates to parallel execution and explains what information you should be gleaming from the plan and how it affects the execution. It offers insight into what caused the Optimizer to make the decision it did as well as a set of corrective measures that can be used to improve each aspect of the plan.

Ground Breakers Romania: Explain the explain_plan

Maria Colgan

This session was delivered as part of the EMEA Ground Breakers tour in Romania, Oct. 2019. The execution plan for a SQL statement can often seem complicated and hard to understand. Determining if the execution plan you are looking at is the best plan you could get or attempting to improve a poorly performing execution plan can be a daunting task even for the most experienced DBA or developer. This session examines the different aspects of an execution plan, from selectivity to parallel execution and explains what information you should be gleaming from the plan and how it affects the execution. It offers insight into what caused the Optimizer to make the decision it did as well as a set of corrective measures that can be used to improve each aspect of the plan.

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SQL is a standard language used to manage data in relational database systems. The SELECT statement is used to retrieve data from databases. It allows specifying columns, tables, filters and sorting. Common clauses include SELECT, FROM, WHERE, ORDER BY, and optional clauses like DISTINCT, GROUP BY and HAVING. Operators allow filtering rows by conditions, ranges, patterns and more. SQL is a non-procedural language used to perform queries, inserts, updates and deletes on a relational database.

SQL Server Views

Randy Riness @ South Puget Sound Community College

Views provide a virtual table that allows users to select specific columns and rows from underlying tables without storing any data. Views can reduce complexity, hide sensitive data, and improve performance. Indexed views can significantly improve query performance by adding an index, but have additional requirements around determinism and schema binding. Views must meet certain criteria to be updateable.

Advanced Sql Training

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The document summarizes topics that will be covered in an advanced SQL training seminar, including SQL statement types, data types, aggregate functions, NULL handling, comparison operators, mathematical functions, joins, subqueries, views, materialized views, inline views, and optimizing SQL queries. Techniques for data sharing between databases are also mentioned. The seminar aims to provide in-depth knowledge of SQL concepts through explanations, examples, exercises and discussion.

This document provides an introduction to the SELECT clause in SQL and how to write basic and advanced SELECT statements. It covers selecting columns, using literals and operators, filtering rows with comparison and logical operators, and ordering results with the ORDER BY clause. Examples are provided for concatenation, mathematical expressions, restricting rows based on conditions, pattern matching with LIKE, and sorting ascending or descending.

Part4 Influencing Execution Plans with Optimizer Hints

Maria Colgan

Part 4 of the SQL Tuning workshop is called “Harnessing the power of optimizer hints”. Although I am not a strong supporter of adding hints to SQL statements for a whole host of reasons, from time to time, it may become necessary to influence the plan the Optimizer chooses. The most powerful way to alter the plan chosen is via Optimizer hints. But knowing when and how to use Optimizer hints correctly is somewhat of a dark art. This session explains how Optimizer hints are interpreted, when and where they should be used, and why they sometimes appear to be ignored.

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The document discusses various SQL statements and concepts. It introduces the different types of SQL statements - DQL, DML, DDL, TCL, DCL and describes common statements like SELECT, INSERT, UPDATE, DELETE. It also covers SQL concepts like data types, NULL values, joins, aggregation, sorting, filtering using WHERE clause and logical operators. Single-row functions for character, number and date manipulations are explained along with examples.

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Amrit Kaur

The document provides an overview of SQL concepts for retrieving and manipulating data using SQL statements like SELECT, JOIN, GROUP BY, and subqueries. It discusses the key clauses and operations for projection, selection, aggregation, sorting, joining tables, grouping data, and using subqueries. Some important points covered include using SELECT to retrieve specific attributes or calculate column values, filtering rows with WHERE, sorting with ORDER BY, aggregation functions, inner/outer/cross joins, and applying grouping and aggregation at different levels with ROLLUP and CUBE.

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This document discusses SQL SELECT statements and their use in retrieving data from database tables. It covers: - The basic SELECT statement syntax including selecting all or specific columns and from which table(s) - Additional functionality like arithmetic expressions, column aliases, concatenation operators, and literal strings - How to work with null values, define column headings, and eliminate duplicate rows - The interaction between SQL statements and the iSQL*Plus environment for running queries

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The document provides guidelines for optimizing SQL and PL/SQL code for performance. It discusses best practices for using indexes like creating them on frequently queried columns and avoiding functions on indexed columns. Other topics covered include using EXISTS instead of JOINs when possible, avoiding DISTINCT, and placing filters in the WHERE clause instead of HAVING. Modular code design, avoiding negatives and LIKE patterns, and letting the optimizer do its work are also recommended. The goal is to help programmers write efficient code by understanding query execution and tuning techniques.

Where conditions and Operators in SQL

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The SELECT statement is used to retrieve data from one or more tables. It allows you to select specific columns, rows, and expressions. The general syntax includes keywords like SELECT, FROM, WHERE, and clauses for filtering, sorting, grouping, and joining results. Examples demonstrate how to select all data, particular rows and columns, use aliases, DISTINCT, comparison operators, patterns, ranges, and handle NULL values.

Introduction to oracle functions

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Introduction To Oracle Sql

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Advanced functions in PL SQL

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Analytic functions allow calculations to be performed on sets of rows and return multiple rows of data per record. They are similar to aggregate functions but do not group results. Some common analytic functions discussed include ROW_NUMBER, RANK, DENSE_RANK, LEAD, LAG, FIRST_VALUE, LAST_VALUE. The document also describes functions like LISTAGG, TRANSLATE, REGEXP_LIKE, REGEXP_COUNT, COALESCE, EXTRACT, ADD_MONTHS, INITCAP, INSTR and GREATEST.

Views, Triggers, Functions, Stored Procedures, Indexing and Joins

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The document provides information about various SQL concepts like views, triggers, functions, indexes, and joins. It defines views as virtual tables created by queries on other tables. Triggers are blocks of code that execute due to data modification language statements on tables. Functions allow reusable code and improve clarity. Indexes speed up searches by allowing fast data retrieval. Joins combine data from two or more tables based on relationships between columns. Stored procedures are SQL statements with an assigned name that are stored for shared use.

Database development coding standards

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This document provides guidelines for developing databases and writing SQL code. It includes recommendations for naming conventions, variables, select statements, cursors, wildcard characters, joins, batches, stored procedures, views, data types, indexes and more. The guidelines suggest using more efficient techniques like derived tables, ANSI joins, avoiding cursors and wildcards at the beginning of strings. It also recommends measuring performance and optimizing for queries over updates.

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Iban culture

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1) Ibans are an indigenous ethnic group located mainly in Sarawak, Malaysia. They speak the Iban language and traditionally live in longhouses. 2) A key part of Iban culture is their festivals, especially Gawai Dayak which celebrates the rice harvest. As part of the festival there is tuak drinking, ceremonies, and the kujuk tradition of sharing food. 3) Iban traditional clothing, music, and dance are also important aspects of their culture. For dance, the ngajat is performed during festivals and has different styles for men and women. Their clothing includes ngepan and sirat. Musical instruments include gendang engkerumung and bebend

Sarawak

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Sarawak is located in Malaysian Borneo and is home to a rich diversity of cultures and natural attractions. It has 28 ethnic groups with distinct cultures and languages. Major ethnic groups include Iban, Chinese, Malay, and other native tribes. Notable places to visit include the Sarawak Cultural Village, Bako National Park, Damai Beach, Sunday Market in Satok, Kuching Waterfront, Niah National Park, and Gunung Mulu National Park. These locations offer insights into culture, opportunities for nature activities, and places of historical significance. Kuching International Airport is the main entry point for visiting Sarawak.

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Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/ DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen! Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell. Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten. Diese Themen werden behandelt - Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten - Wie funktionieren CCB- und CCX-Lizenzen wirklich? - Verstehen des DLAU-Tools und wie man es am besten nutzt - Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw. - Praxisbeispiele und Best Practices zum sofortigen Umsetzen

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HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU

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