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Oracle Function Result Cache | Steven Feuerstein
 
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Returning for his seventh 2 Minute Tech Tip, Oracle architect and "Oracle PL/SQL Programming 6e" author Steven Feuerstein delivers the details on the Function Result Cache, a feature introduced in Oracle Database 11g that can add a performance boost to your applications.
Oracle 11g Result Cache Tutorial by SkillBuilders.com
 
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Dave Anderson of SkillBuilders.com/11g demonstrates how to improve query performance with the Oracle 11g Result Cache.
Views: 2487 SkillBuilders
Efficient Function Calls From SQL (Part 3) : PL/SQL Function Result Cache
 
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The third part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we take a look at the Cross-Session PL/SQL Function Result Cache introduced in Oracle 11g. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#oracle-11g-caching https://oracle-base.com/articles/11g/cross-session-plsql-function-result-cache-11gr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Auckland Oracle DBAs Meetup : Website: http://www.meetup.com/Auckland-Oracle-DBAs-Meetup/ Sponsors: - DBvisit: http://www.dbvisit.com/ - Datacom: http://www.datacom.co.nz/ - Oracle New Zealand: http://www.oracle.com/ - Pythian: http://www.pythian.com/ - Enterprise IT: http://www.enterpriseit.co.nz/ Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 2960 ORACLE-BASE.com
Oracle Coherence: Explaining the 3 Cache Types
 
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Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Caching Business Service Results and Enabling Load Balancing in Oracle Service Bus
 
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This video shows you how to improve performance by enabling result caching and configuring load balancing in Oracle Service Bus. ================================= For more information, see http://www.oracle.com/goto/oll Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
How to Cache Database Queries with Redis in Laravel - Redis Series Episode 4
 
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In this short episode, I show you how you can cache database queries for a certain period of time. This is really nice when you have data you know won't change during x period of time, because once it's in cache, Laravel knows to automatically skip the database query and immediately deliver the requested content from RAM. Super fast, super easy. Here's the complete project throughout all episodes: https://gitlab.com/Christf24/RedisCast/tree/master/ Next episode will go over tagging with Redis (for blog posts, movie genres, or whatever else). Previous episode (Counting page views, and creating a "Top Viewed Article" list on home page): https://www.youtube.com/watch?v=ZMjw5WFPG8c Next episode (Tagging articles, products, movies, etc..): http://youtu.be/L2keoHFThwY
Views: 22443 Christophe Limpalair
Will huge Consistent Reads floods BUFFER CACHE?
 
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Video Blog on Oracle Real Time Activity regarding CACHE chains in BUFFER CACHE on Consistent Read operations. Looking for Oracle DBA training? WhatsApp/Contact: +919951696808 More training options at www.orskl.com/training
Views: 1991 OrSkl Academy
Oracle Disk Manager (ODM) and Cached ODM
 
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This video describes Oracle Disk Manager (ODM) and Cached ODM (CODM) and how Storage Foundation uses these.
Buffer Cache
 
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This video is part of the Udacity course "GT - Refresher - Advanced OS". Watch the full course at https://www.udacity.com/course/ud098
Views: 17060 Udacity
Cache Management - Design of Computer Programs
 
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This video is part of an online course, Design of Computer Programs. Check out the course here: https://www.udacity.com/course/cs212.
Views: 863 Udacity
Full DB In-Memory Caching
 
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This is the first of two demonstrations about In-Memory caching new features, introduced in Oracle Database 12.1.0.2. This one illustrates the Full Database In-memory Caching feature enabling an entire database to be cached in memory when the database size is smaller than the buffer cache size. Caching and running a database from memory leads to huge performance benefits. Copyright © 2014 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the "Materials"). The Materials are provided "as is" without any warranty of any kind, either express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement.
Oracle Business Intelligence Server Caching | Robin Moffatt
 
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Oracle ACE Robin Moffatt, Principal Consultant and Trainer with Rittman Mead, packs his tech tip with advice on what, when, and how to use Oracle BI Server Caching.
Caching in Applications Still Matters
 
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Henri Tremblay, Senior Software Engineer, Terracotta, a Software AG company Anthony Dahanne, Software Developer, Software AG Is caching data in your application still relevant today, with all those HTTP caches, very fast key value stores, and microservices? During this presentation, you will learn the basics of caching (TTL, TTI, invalidation, tiering, and so on), key figures in the caching world, how the Java community came up with a specification (JSR 107), and how you can leverage it in your application with the implementation of your choice (EhCache 3). During the multiple demos, you’ll even see how you can sync up your (clustered) caches when you start scaling your application.
Views: 162 Oracle Developers
SOA and Applications Grid: Using Service Result Cache
 
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In a whiteboard demonstration, Oracle's Dave Chappell discusses how to use the Service Result Cache in SOA and applications grids.
Views: 665 Oracle Video
Why Hewlett Packard Chose Altibase Over Oracle TimesTen?
 
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Altibase easily outperforms Oracle TimesTen. Moreover, Altibase is open source.
Views: 2074 Altibase
Oracle Database + TimesTen (In-Memory Database)
 
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This short video shows the benefits of running PL/SQL with In-Memory Database Cache (IMDB Cache) for the Oracle Database. It demonstrates using TimesTen as an in-memory database cache to enhance the performance. Softwares: Oracle 11gR2 Oracle In-Memory Database Cache 11gR2 SQL Developer 3.0 Oracle Enterprise Manager (OEM) 11g
Webinar: All About the Function Result Cache
 
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Presented by Steven Feuerstein, Oracle Corporation The function result cache, added in Oracle Database 11g, offers developers a way to dramatically reduce the amount of time it takes to retrieve data requested repeatedly by database sessions (specifically, when the same rows of a table are fetched much more frequently than they are changed). This cache is stored in the SGA, shared across all sessions in the instance, and automatically purged of "dirty data" by the Oracle Database. Every application running on 11.1 or higher should be taking advantage of this feature. Best of all, there is minimal impact on your code to start using this feature.
Views: 1057 ODTUG
Automatic Big Table Caching
 
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This is the second of two demonstrations about In-Memory caching new features, introduced in Oracle Database 12.1.0.2. This one illustrates the Automatic Big Table caching feature enhancing the in-memory parallel query capabilities of the Oracle Database in both single instance and Oracle RAC environments. An optional section of the buffer cache, called the big table cache, is used to store data for serial and parallel table scans. Copyright © 2014 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the "Materials"). The Materials are provided "as is" without any warranty of any kind, either express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement.
Managing Oracle Database In-Memory
 
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In this second of three presentations, Maria Colgan explains how to control which objects get populated into the column store and how to monitor the performance of queries against the column store.
Data Caching Strategies for Oracle Mobile Application Framework (part I)
 
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Fetching and forgetting data access is not optimal for mobile applications and Oracle Mobile Application Framework in particular. Data transfer is expensive in terms of performance and network bandwidth for mobile applications. We should optimize this and implement data caching for successful Oracle Mobile Application Framework applications. Learn how to use a local Oracle Mobile Application Framework SQLite database to cache data and minimize web service calls. This practical session explains a strategy for how and when to cache and refresh data and includes live demos for Oracle Mobile Application Framework data caching strategies.
Views: 282 Andrej Baranovskij
Oracle Coherence Data Grid
 
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Google Tech Talks June 27, 2007 ABSTRACT Data Grid-based infrastructures are being developed, deployed and used to achieve unlimited application scalability and continuous availability. This presentation focuses on Oracle Coherence Data Grid and how it's capabilities, which includes coherent in-memory caching, dynamic data partitioning, even processing, parallel query and process execution and on how these capabilities enable achievement of these goals and more. In this presentation we will address: · How Coherence capabilities function, such as coherent in-memory caching, dynamic data partitioning, and parallel query and process execution, and how they enable a new generation of grid...
Views: 35150 GoogleTechTalks
Caching In: Understand, Measure, and Use Your CPU Cache More Effectively
 
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Modern computationally intensive tasks are rarely bottlenecked by the absolute performance of your processor cores. The real bottleneck in 2013 is getting data out of memory. CPU caches are designed to alleviate the difference in performance between CPU core clock speed and main memory clock speed, but developers rarely understand how this interaction works or how to measure or tune their application accordingly. This session aims to address this by • Describing how CPU caches work in the latest Intel hardware • Showing what and how to measure in order to understand the caching behavior of software • Giving examples of how this affects Java program performance and what can be done to address poor cache utilization Author: Richard Warburton Richard Warburton is a software developer who loves solving complex problems, but actively challenges how much of software development is dealing with day-to-day trivialities. Having obtained a PhD in the area of compiler optimizations and static analysis, he has been applying his abilities in industry. Initially on bytecode analysis software, and more recently on Java performance tuning tools. He actively involves himself in the London Java Community, and its Java Community Process Committee. He has been helping with the push to improve and complete the JSR 310 API and the expand community engagement with JSR 335. View more trainings by Richard Warburton at https://www.parleys.com/author/richard-warburton Find more related tutorials at https://www.parleys.com/category/developer-training-tutorials
Views: 15260 Oracle Developers
Data Caching Strategies for Oracle Mobile Application Framework (part II)
 
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Fetching and forgetting data access is not optimal for mobile applications and Oracle Mobile Application Framework in particular. Data transfer is expensive in terms of performance and network bandwidth for mobile applications. We should optimize this and implement data caching for successful Oracle Mobile Application Framework applications. Learn how to use a local Oracle Mobile Application Framework SQLite database to cache data and minimize web service calls. This practical session explains a strategy for how and when to cache and refresh data and includes live demos for Oracle Mobile Application Framework data caching strategies.
Views: 283 Andrej Baranovskij
Java Caching (JSR 107): The State of the Union
 
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Now that the Java Caching API has been ratified, it’s time to look at what’s new since it was first proposed. This session covers some of the background decisions behind the API, what survived, what was removed, what was refactored, and what’s next. It discusses how to adopt the new API to improve application performance and scalability. It also outlines how to identify and locate a suitable caching provider at runtime, how to use the API manually, how to use the API declaratively (through annotations), and how to integrate applications with the caching infrastructure through the use of entry processors. Authors: Brian Oliver Brian Oliver is an Architect at Oracle. He works with the Coherence and Messaging Engineering teams predominantly focusing on high-performance computing and architectures for scalability. Over the past 10 years he's been leading the development of large-scale multi-language and multi-currency Web, E-Commerce, Sports Gaming and Financial systems making extensive use of Java technologies. He's the founder of the Coherence SIG, one of the only regularly meeting Data Grid Special Interest Groups in the world, and the Coherence Incubator, a site dedicated to providing reference implementations of architectural patterns on top of Oracle Coherence. He's been using Java since 1996. He opens an IDE every couple of days to cook up new distributed computing solutions. View more trainings by Brian Oliver at https://www.parleys.com/author/brian-oliver Greg Luck Greg founded Ehcache in 2003. He regularly speaks at conferences, writes and codes. He has also founded and maintains the JPam and Spnego open source projects, which are security focused. Prior to joining Terracotta in 2009, Greg was Chief Architect at Wotif.com where he provided technical leadership as the company went from a single product startup to a billion dollar public company with multiple product lines. Before that Greg was a consultant for ThoughtWorks with engagements in the US and Australia in the travel, health care, geospatial, banking and insurance industries. Before doing programming, Greg managed IT. He was CIO at Virgin Blue, Tempo Services, Stamford Hotels and Resorts and Australian Resorts. He is a Chartered Accountant, and spent 7 years with KPMG in small business and insolvency. View more trainings by Greg Luck at https://www.parleys.com/author/greg-luck Find more related tutorials at https://www.parleys.com/category/developer-training-tutorials
Views: 4147 Oracle Developers
Oracle Coherence Quickstart Tutorials: Pre-Loading Cache | packtpub.com
 
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Part of 'Oracle Coherence Quickstart' video series. For the full Course visit: http://www.packtpub.com/oracle-coherence-quickstart/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu Loading thousands of objects into the cache can be a slow process; we'll examine how you can speed it up. • Perform bulk load and distributed load operations ----------------------------------------------------------------------------------------------- For the latest in Big Data and Business Intelligence video tutorials, please visit: http://www.packtpub.com/books/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu Find us on Facebook -- http://www.facebook.com/Packtvideo Follow us on Twitter - http://www.twitter.com/packtvideo
Views: 3347 Packt Video
Oracle Datenbank 12c In-Memory Cache Option Teil 1: Architektur
 
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Am 18. September 2014 haben wir die In-Memory Cache Option der Oracle 12c Datenbank im Rahmen eines Events vorgestellt. Im ersten Teil stellen wir die Architekur vor.
Views: 247 DBMasters
Coherence 12.2.1 - Federated Caching
 
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An overview of the federated caching features included in the Oracle Coherence 12c (12.2.1) release. Coherence 12.2.1 YouTube Playlist: https://www.youtube.com/playlist?list=PLxqhEJ4CA3JtazSZ0CI9JyriEjyHkb-9R Oracle Coherence: ‪http://coherence.oracle.com‬ Coherence on OTN: http://www.oracle.com/technetwork/middleware/coherence/overview/ The Coherence Community: ‪https://java.net/projects/coherence Coherence Discussion Forums: https://forums.oracle.com/community/developer/english/fusion_middleware/application_server/coherence_support
Views: 1358 OracleCoherence
OBIEE Cache Doubt
 
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Views: 18 peddolaaravind
Oracle Coherence Tutorial: Clustered Cache Topologies -- Partitioned Cache | packtpub.com
 
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Part of 'Oracle Coherence Quickstart' video series. For the full Course visit: http://www.packtpub.com/oracle-coherence-quickstart/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu A Partitioned Cache can hold much more data than a replicated cache in a clustered environment. • Configure a distributed scheme in the cache configuration file • Test the distributed cache • Monitor the distributed cache via JMX ------------------------------------------------------------------------------------------------ For the latest in Big Data and Business Intelligence video tutorials, please visit: http://www.packtpub.com/books/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu Find us on Facebook -- http://www.facebook.com/Packtvideo Follow us on Twitter - http://www.twitter.com/packtvideo
Views: 749 Packt Video
How to use Wercker cache
 
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How to use Wercker cache to store data, and use that data in pipeline runs. ================================= To improve the video quality, click the gear icon and set the Quality to 1080p/720p HD. For more information, see http://www.oracle.com/goto/oll and http://docs.oracle.com Copyright © 2018 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Clear OBIEE Cache remotely
 
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Clear cache of OBIEE hosted in Windows landscape from a different server
Views: 460 The Analytics World
Getting Started with Oracle Coherence
 
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Join our monthly email newsletter to gain insight into the middleware industry's best practices http://www.c2b2.co.uk/middleware_newsletter_c2b2 Part 2 of the Coherence Webinar Series In this webinar we will demonstrate the principles of Oracle Coherence and develop the code to store data in and retrieve data from the grid. Delivered by Mike Croft and Arvind Anandam on the 11th of June 2013 To find out more visit http://www.c2b2.co.uk/oracle_coherence_webinars
Views: 14108 c2b2 Consulting
Oracle Coherence Tutorial : Clustered Cache Topologies -- Replicated Cache  | packtpub.com
 
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Part of 'Oracle Coherence Quickstart' video series. For the full Course visit: http://www.packtpub.com/oracle-coherence-quickstart/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu All cache servers need to access the same data; use replicated caches to reduce processing time. • Configure a replicated scheme in the cache configuration file • Test the replicated cache • Monitor the replicated cache via JMX ---------------------------------------------------------------------------------------------- For the latest in Big Data and Business Intelligence video tutorials, please visit: http://www.packtpub.com/books/video?utm_source=youtube&utm_medium=video-description&utm_campaign=yt-oraclecohqu Find us on Facebook -- http://www.facebook.com/Packtvideo Follow us on Twitter - http://www.twitter.com/packtvideo
Views: 1679 Packt Video
Exadata Flash Cache and Database In-Memory
 
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Held on August 29 2018 Explore the Database In-Memory option with Markus Kissling, Product Manager for In-Memory, based in Germany. Oracle Database In-Memory optimizes both analytics and mixed workload OLTP, delivering outstanding performance for transactions while simultaneously supporting real-time analytics, business intelligence, and reports. Learn about new features of Oracle Database 18c and how to use Exadata Flash Cache. AskTOM Office Hours offers free, monthly training and tips on how to make the most of Oracle Database, from Oracle product managers, developers and evangelists. https://asktom.oracle.com/ Oracle Developers portal: https://developer.oracle.com/ Sign up for an Oracle Cloud trial: https://cloud.oracle.com/en_US/tryit music: bensound.com
Views: 243 Oracle Developers
Oracle Database 12c demos: In-Memory Column Store Architecture Overview
 
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The demonstration provides an overview of the architecture of the In-Memory Column Store feature introduced in Oracle Database 12c Release 1 patchset 1.
Oracle Database In-Memory Performance Demo
 
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Demonstration of Oracle Database In-Memory from Oracle's Real World Performance Team.
Oracle Coherence 12c: Strategy and Roadmap
 
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Join Craig Blitz (Director of Product Management) as he discusses new features in Oracle Coherence 12c, including the HotCache feature of Oracle GoldenGate and Oracle Coherence’s Managed Coherence Servers feature. Oracle Coherence also provides new options for integration, including support for JCache (JSR 107), and new monitoring capabilities. You’ll learn about innovative features such as Recoverable Caching, Federated Caching, multitenancy, and support for Oracle Cloud.
JSON in Oracle 12C Part 1 - Creating JSON Columns in Tables
 
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This is the first video in a series of videos on how to handle JSON data in Oracle 12C. In this video, I'll show you how to create columns in a table that will be used to hold JSON data.
Views: 4706 Pretty Printed
Database Tutorial 72 - SGA Database Buffer Part 1  - Oracle DBA Tutorial
 
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Database Tutorial 72 - SGA Database Buffer Part 1 - Oracle DBA Tutorial
Views: 5917 Sam Dhanasekaran
Redis Beginner Tutorial 1 - What is REDIS
 
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Today we will learn redis from scratch REDIS = remote dictionary server What is redis ? Redis is a KEY-VALUE store a store/server that stores data as key-value pairs e.g. Name=John Key=Value this key-value store can be used as a database to read and write data as key-values Features: Its a No-SQL db Uses data structures to store data Interaction with data is command based Its an in-memory db (with persistence options) Salvatore Sanfilippo (original developer) May 10, 2009 (first release) Cross Platform (written in ANSI C) Open Source References. https://redis.io/ Redis Playlist - https://www.youtube.com/playlist?list=PLhW3qG5bs-L8n1fsiT8z_VnDhnUk4vaVq Like on Facebook - https://www.facebook.com/automationst... Subscribe on: Youtube - http://youtube.com/automationstepbystep ________ ONLINE COURSES TO LEARN ________ Visit - http://automationstepbystep.com/ ------------ UI TESTING ------------ Selenium Beginners - https://bit.ly/2MGRS8K Selenium Java Framework from Scratch - https://bit.ly/2N9xvR6 Selenium Python - https://bit.ly/2oyMp5x Selenium Tips - https://bit.ly/2owxc50 Selenium Builder - https://bit.ly/2MKNtlq Katalon Studio - https://bit.ly/2wARFdi Robot Framework - https://bit.ly/2Px6Ue9 ------------ API TESTING ------------ Web Services (API) - https://bit.ly/2MGafL7 SoapUI - https://bit.ly/2MGahmd Postman - https://bit.ly/2wz8LrW General - https://bit.ly/2PYdwmV ------------ MOBILE TESTING ------------ Mobile Playlist - https://bit.ly/2PxpeUv ------------ CI | CD | DEVOPS ------------ Jenkins Beginner - https://bit.ly/2MIn8EC Jenkins Tips & Trick - https://bit.ly/2LRt6xC Docker - https://bit.ly/2MInnzx ------------ VERSION CONTROL SYSTEM ------------ Git & GitHub - https://bit.ly/2Q1pagY ------------ PERFORMANCE TESTING ------------ JMeter Beginner - https://bit.ly/2oBbtIU JMeter Intermediate - https://bit.ly/2oziNVB JMeter Advanced - https://bit.ly/2Q22Y6a JMeter Tips & Tricks - https://bit.ly/2NOfWD2 Performance Testing - https://bit.ly/2wEXbLS ------------ JAVA ------------ Java Beginners - https://bit.ly/2PVUcXs Java Tips & Tricks - https://bit.ly/2CdcDnJ ------------ MAVEN ------------ Maven - https://bit.ly/2NJdDRS ------------ OTHERS ------------ Redis- https://bit.ly/2N9jyCG Misc - https://bit.ly/2Q2q5xQ Tools & Tips - https://bit.ly/2oBfwoR QnA Friday- https://bit.ly/2NgwGpw Sunday Special - https://bit.ly/2wB23BO Ask Raghav- https://bit.ly/2CoJGWf Interviews - https://bit.ly/2NIPPxk All Playlists - https://bit.ly/2LSiezA ------------ FOLLOW ------------ Facebook - https://www.facebook.com/automationstepbystep Twitter - https://twitter.com/automationsbs Youtube - http://youtube.com/automationstepbystep
Distributed Caching to Data Grids: The Past, Present, and Future of Scalable Java
 
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Ten years ago, driven by demands for scalable architecture as a result of new internet-inspired business models and the SOA revolution, we saw the birth of the Java distributed caching market. Since then we have seen an explosion of functionality, taking the paradigm on a ride from from simple distributed caching to the more robust data grid. This session presents the history of Java distributed caching and its most important innovations and details how this technology has become integral to enterprises building reliable and scalable large-scale distributed systems (including financial services, travel, online gaming, retail, and many others). Come get a glimpse into how the technology might evolve and how enterprises will adopt it. Copyright © 2013 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the "Materials"). The Materials are provided "as is" without any warranty of any kind, either express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement.
RTView Oracle Coherence Monitor - "Single Cache" Views
 
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This demo will show you how you can look at all current and historical metrics about any cache, including currently activity, number and size of objects in a cache as well as trend information.
Views: 427 slrtview
MySQL 101: 69 - Query Caching
 
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MySQL 101: 69 - Query Caching
Views: 122 CarAni Studio
enable or desable caching in obiee11g
 
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This tutorial describes about how to enable or desable caching in obiee11g
Efficient Function Calls From SQL (Part 2) : The DETERMINISTIC Hint
 
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The second part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we take a look at the DETERMINISTIC hint. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#deterministic-hint Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Dana Singleterry : Blog: https://blogs.oracle.com/dana/ Twitter: https://twitter.com/dsingleterry Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 2288 ORACLE-BASE.com
Sql server query plan cache
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache.html Slides http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache_12.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All SQL Server Tutorial Videos https://www.youtube.com/playlist?list=PL08903FB7ACA1C2FB All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss 1. What happens when a query is issued to SQL Server 2. How to check what is in SQL Server plan cache 3. Things to consider to promote query plan reusability What happens when a query is issued to SQL Server In SQl Server, every query requires a query plan before it is executed. When you run a query the first time, the query gets compiled and a query plan is generated. This query plan is then saved in sql server query plan cache. Next time when we run the same query, the cached query plan is reused. This means sql server does not have to create the plan again for that same query. So reusing a query plan can increase the performance. How long the query plan stays in the plan cache depends on how often the plan is reused besides other factors. The more often the plan is reused the longer it stays in the plan cache. How to check what is in SQL Server plan cache SELECT cp.usecounts, cp.cacheobjtype, cp.objtype, st.text, qp.query_plan FROM sys.dm_exec_cached_plans AS cp CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS st CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY cp.usecounts DESC As you can see we have sorted the result set by usecounts column in descending order, so we can see the most frequently reused query plans on the top. usecounts - Number of times the plan is reused objtype - Specifies the type of object text - Text of the SQL query query_plan - Query execution plan in XML format To remove all elements from the plan cache use the following command DBCC FREEPROCCACHE In older versions of SQL Server up to SQL Server 6.5 only stored procedure plans are cached. The query plans for Adhoc sql statements or dynamic sql statements are not cached, so they get compiled every time. With SQL Server 7, and later versions the query plans for Adhoc sql statements and dynamic sql statements are also cached. Things to consider to promote query plan reusability For example, when we execute the following query the first time. The query is compiled, a plan is created and put in the cache. Select * From Employees Where FirstName = 'Mark' When we execute the same query again, it looks up the plan cache, and if a plan is available, it reuses the existing plan instead of creating the plan again which can improve the performance of the query. However, one important thing to keep in mind is that, the cache lookup is by a hash value computed from the query text. If the query text changes even slightly, sql server will not be able to reuse the existing plan. For example, even if you include an extra space somewhere in the query or you change the case, the query text hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. Another example : If you want the same query to find an employee whose FirstName is Steve instead of Mark. You would issue the following query Select * From Employees Where FirstName = 'Steve' Even in this case, since the query text has changed the hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. This is why, it is very important to use parameterised queries for sql server to be able to reuse cached query plans. With parameterised queries, sql server will not treat parameter values as part of the query text. So when you change the parameters values, sql server can still reuse the cached query plan. The following query uses parameters. So even if you change parameter values, the same query plan is reused. Declare @FirstName nvarchar(50) Set @FirstName = 'Steve' Execute sp_executesql N'Select * from Employees where [email protected]', N'@FN nvarchar(50)', @FirstName One important thing to keep in mind is that, when you have dynamic sql in a stored procedure, the query plan for the stored procedure does not include the dynamic SQL. The block of dynamic SQL has a query plan of its own. Summary: Never ever concatenate user input values with strings to build dynamic sql statements. Always use parameterised queries which not only promotes cached query plans reuse but also prevent sql injection attacks.
Views: 24125 kudvenkat
Oracle 12c Performance Essentials exam - Force Full DB Caching
 
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Oracle 12c Performance Essentials exam - Force Full DB Caching, from ExamREVIEW

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