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Optimizing SQL Performance
 
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Held on July 12 2018 In July's session we mainly looked at performance. Highlights include: 1:30 How does the database process subqueries? 5:20 Performance: comparing insert ... select to create tmp table, insert select from tmp; DDL in PL/SQL; dynamic SQL problems 12:45 18c private temporary tables; tables specific to a session; DDL you can rollback across! 21:00 Improving update performance: things to watch for; insert vs. update; "join-update" - create a view instead; create table as select "update" 34:05 Analytic function performance: first_value non-determinism; min keep vs first_value; computing function in a subquery; indexes for analytic functions 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: 747 Oracle Developers
Oracle Hints Tutorial for improving performance
 
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Oracle Hints Tutorial for improving performance APPEND PARALLEL JOIN INDEX NO_INDEX SELECT /*+ FIRST_ROWS(10) */ * FROM emp WHERE deptno = 10; SELECT /*+ ALL_ROWS */ * FROM emp WHERE deptno = 10; SELECT /*+ NO_INDEX(emp emp_dept_idx) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ INDEX(e,emp_dept_idx) */ * FROM emp e WHERE e.deptno = 10; -- SELECT /*+ INDEX(scott.emp,emp_dept_idx) */ * FROM scott.emp; SELECT /*+ AND_EQUAL(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ INDEX_JOIN(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ PARALLEL_INDEX(e,emp_dept_idx , 8) */ * FROM emp e; SELECT /*+ LEADING (dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ PARALLEL(8) CACHE (e) FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL USE_MERGE (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- SORT Merge Join SELECT /*+ PARALLEL USE_HASH (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- Hash Join SELECT /*+ PARALLEL */ * FROM emp e ; INSERT /*+ APPEND */ INTO mytmp select /*+ CACHE (e) */ *from emp e; commit;
Views: 10293 TechLake
Oracle Performance Tuning using Bulk Collect.
 
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This video will give you understanding of Bulk Collect and Bulk Binding for Performance Tuning,
Views: 17021 amit wadbude
BULK COLLECT and FORALL-A PL/SQL Performance Booster
 
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In this Video Tutorial, I have covered 2 great feature in Oracle PL/SQL - BULK COLLECT and FORALL with some demos.
Views: 56253 Anindya Das
Oracle Performance Tuning - Loading Data - 04 Direct Path Load
 
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Connect with me or follow me at https://www.linkedin.com/in/durga0gadiraju https://www.facebook.com/itversity https://github.com/dgadiraju https://www.youtube.com/c/TechnologyMentor https://twitter.com/itversity
Views: 2047 itversity
High Performance Bulk Data Loading
 
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What is the best way to get data into an Oracle database? This session covers how to bulk load data quickly into an Oracle database. It will help developers avoid common gotchas that will limit performance, and it gives insight into how to make sure the solution will be database AND DBA-friendly! Example SQL is used to demonstrate the solution, and links to working examples will be provided.
Oracle SQL Loader - How to load data from file(.csv, .dat, .txt) into table - Tutorial - 3
 
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This video is the third tutorial on Oracle SQL*Loader tutorial series created by Kishan Mashru. Oracle SQL Loader utility is used to load data from flat files like .csv files, .dat files, .txt files into Oracle database tables. In this video tutorial, we demonstrated how to load data from excel to oracle using sql loader We showed the SQL Loader control file example and loaded data from the .csv file into the database table. Check out the first video: https://youtu.be/fSV51bljrwY Check out the second video: https://youtu.be/ogidUWHHRL8 Check out the advantages of using TRUNCATE over a DELETE from the following video: Delete VS Truncate : https://youtu.be/u76wMm2byXo #KishanMashru #Oracle #SqlLoader #SqlLoaderExample #LoadCSV #LoadExcel #SQLandPLSQL #OracleSqlLoader #ETL #database
Views: 6193 Kishan Mashru
Oracle : Stored Procedure with Input and Output Parameters
 
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Java Source Code here: http://ramj2ee.blogspot.com/2015/07/oracle-stored-procedure-with-input-and.html Oracle : Stored Procedure with Input and Output Parameters JavaEE Tutorials and Sample code - Click here : http://ramj2ee.blogspot.in/
Views: 40577 Ram N
Coding for High Performance Data Loading in Oracle Database
 
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This session covers how to load data quickly into an Oracle database using clients implemented in languages such as Java, C++, Ruby, Python and PHP. It focuses on scenarios where data arrives continuously and must be made visible and queryable as soon as possible. Java code examples are presented with some Python
Improve load performance with Bulk Load in Talend
 
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Improve load performance with Bulk Load in Talend. Difference between Bulk and simple load. ETL Performance Optimization tips. For details visit: http://www.vikramtakkar.com/2013/07/improve-load-performance-with-bulk-load.html
Views: 15865 Vikram Takkar
JSON In the Oracle Database 12c Release 1 (12.1.0.2)
 
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A really quick look at the ability to store JSON in the Oracle Database 12c Release 1 (12.1.0.2) and accessing it using Python and the Oracle_CX open source driver. You can find the Oracle documentation on it here http://docs.oracle.com/database/121/ADXDB/json.htm#ADXDB6246
Views: 8985 Dominic Giles
Real-World Performance - 4 - Bind Variables and Soft Parse
 
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Check out the entire series on the Oracle Learning Library at http://www.oracle.com/goto/oll/rwp In this video, listen and watch Andrew Holdsworth, Vice President of Oracle Database Real-World Performance at Oracle Corporation, as he demonstrates how bind variables and soft parsing make significant performance gains as they contribute to transaction throughput and reverse the mistakes of a poor configuration. 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.
Database Performance Analyzer Overview for Oracle Databases
 
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Learn more: http://slrwnds.com/DPAforOracle This video will give a high level overview on how to use DPA in assisting you to find performance issues in your Oracle instance. Connect with SolarWinds: THWACK: http://thwack.solarwinds.com/ Facebook: https://www.facebook.com/SolarWinds Twitter: https://twitter.com/solarwinds LinkedIn: http://www.linkedin.com/company/solarwinds
Views: 12278 solarwindsinc
Faster Inserts!
 
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Lots of tools generate insert scripts from existing data. But here's a trick to make those inserts run MUCH faster. blog: https://connor-mcdonald.com twitter: https://twitter.com/connor_mc_d All other social media channels here: https://linktr.ee/connor My current favorite Oracle stuff: - Favorite 12.2 feature: Almost all structural maintenance can be done online. No more outages. https://docs.oracle.com/en/database/oracle/oracle-database/12.2/newft/new-features.html#GUID-BEEEA34D-3D81-4360-887C-A92BC711816D - Favorite 18c feature: Killing a runaway SQL without killing the entire session. https://docs.oracle.com/en/database/oracle/oracle-database/18/newft/new-features.html#GUID-49F77A8D-CF54-415C-B04F-DB4CE733C513 - Favorite 19c feature: Handling JSON just got a lot easier! https://docs.oracle.com/en/database/oracle/oracle-database/19/newft/new-features.html#GUID-9587F5B4-871B-401A-8978-BDA491F07F8A Subscribe for new tech videos every week Music: Night Owl (Broke For Free) #oracle #insert #performance
Views: 448 Connor McDonald
Why Is My Query Slow? More Reasons Storing Dates as Numbers Is Bad
 
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Storing dates as numbers can cause unexpected problems. In this video Chris looks at one possible issue: inconsistent query performance. He then shows methods you can use to improve performance, including function-based indexes and histograms. ============================ The Magic of SQL with Chris Saxon 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.
Views: 7694 The Magic of SQL
Performance Anti-Patterns: Non-query DML inside loops
 
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Lots of code follows patterns. Some of the patterns are good ones, some them are bad - and these we call "anti-patterns." In this video, Steven identifies a common and, for many, surprising anti-pattern - and then shows how to turn it into a design pattern worthy of use. The anti-pattern is the execution on non-query DML (inserts, updates, deletes) inside a loop. The refactored positive design is based on bulk processing in PL/SQL. Along the way, Steven shows how this involves moving from row-by-row to phased processing. ================================================== 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.
Oracle Performance Tuning - Loading Data - 05 Direct Path Load
 
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Connect with me or follow me at https://www.linkedin.com/in/durga0gadiraju https://www.facebook.com/itversity https://github.com/dgadiraju https://www.youtube.com/c/TechnologyMentor https://twitter.com/itversity
Views: 1781 itversity
Oracle12c Identity Column Performance on RAC
 
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This demo illustrates the new Oracle 12c IDENTITY column and provides a simple benchmark for it on Oracle RAC databases.
Views: 342 BPeaslandDBA
Oracle SQL MERGE Statement
 
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https://www.databasestar.com/oracle-merge-sql/ In this video, we’ll learn what the Oracle MERGE statement does and how you can use it. What is the MERGE statement? It’s a statement that lets you either insert or update data in a table - all in a single statement! It’s helpful if you’re using an ETL (Extract Transform Load) process when creating or updating a data warehouse. It’s also helpful when loading data into your own database if you’re not creating a data warehouse. It allows you to prevent duplicate data and ensure you have up-to-date data in your table. The syntax looks like this: MERGE INTO table_name USING table_name ON (condition) WHEN MATCHED THEN update_clause DELETE where_clause WHEN NOT MATCHED THEN insert_clause [LOG ERRORS log_errors_clause reject_limit integer | unlimited ] In this video, I also show an Oracle SQL MERGE statement example, so watch the video to find out more. For more information on the MERGE statement and how you can use it in your queries, read the related article here: https://www.databasestar.com/oracle-merge-sql/
Views: 1462 Database Star
How can I insert multiple rows of data in one SQL command in Oracle?
 
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How can I insert multiple rows of data in one SQL command in Oracle? 如何在Oracle中的一個SQL命令中插入多行數據? Hvordan kan jeg indsætte flere rækker med data i en SQL-kommando i Oracle? Kiel mi povas enmeti plurajn vicojn de datumoj en unu SQL komando en Oracle? Comment puis-je insérer plusieurs lignes de données dans une commande SQL dans Oracle? Come posso inserire più righe di dati in un unico comando SQL in Oracle? Как я могу вставить несколько строк данных в одной команде SQL в Oracle? #sqltutorial#oracletutorial#databasetutorial
Views: 6895 Viral Fun Tube
How to use partitioning to improve performance of large tables
 
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In this video we cover in much more detail the improvement in performance that can be achieved by using partitioning. MS SQL server databases can scale well using this feature. We cover how partitioning a table gives similar performance as a single table with a clustered index, we then explore how adding NC index improve performance of the heap table as well as the partitioned table.
Views: 20450 Jayanth Kurup
DML Processing in an Oracle Database -  DBArch Video 8
 
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This video explains the steps involved in processing a DML statement in an Oracle Database Server. Our Upcoming Online Course Schedule is available in the url below https://docs.google.com/spreadsheets/d/1qKpKf32Zn_SSvbeDblv2UCjvtHIS1ad2_VXHh2m08yY/edit#gid=0 Reach us at [email protected]
Views: 62331 Ramkumar Swaminathan
Oracle Tutorial: Multi Table Insert Command, Part 3/3
 
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http://themagnumgroup.net/oracle-developer.htm This is the final part of our advanced tutorial on the use of the multi-table insert command in Oracle databases. Experienced database administrators will immediately see how this command drastically reduces code size and programming time. Please do not hesitate to be in touch if: 1. You have a question about the tutorial 2. You have a question about SQL Developer 3. Your database has slowed down and you need to troubleshoot it 4. You need training on an Oracle subject by an Oracle-certified trainer. To message us, please go here: http://themagnumgroup.net/Message_Form.htm We look forward to hearing from you!
Views: 952 TMGvblog
[Oracle SQL Performance Tuning: 4/4] Basic Hints and their Usage
 
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This presentation explains how to use basic hints of Oracle. The series of SQL tuning videos presents performance tuning tips for developers. For presentation used in this video, please visit: https://drive.google.com/drive/folders/0B6EDqGZwjejmWng5VWM3ZEtaNzA?usp=sharing
Views: 11397 anilkumar ghorakavi
Real-World Performance - 6 - Leaking Cursors
 
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Check out the entire series on the Oracle Learning Library at http://www.oracle.com/goto/oll/rwp In this video, listen and watch Andrew Holdsworth, Vice President of Oracle Database Real-World Performance at Oracle Corporation, as he demonstrates how leaking cursors affect performance. 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 telugu classic full hd HARSHA TABLE CREATE INSERT
 
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thanks to watching my videos please subscribe my channel
Real-World Performance - 15 - Index Contention
 
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Check out the entire series on the Oracle Learning Library at http://www.oracle.com/goto/oll/rwp In this video, listen and watch Andrew Holdsworth, Vice President of Oracle Database Real-World Performance at Oracle Corporation, as he explains how index contention affects performance. 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 SQL TUTORIAL 3: SQL INSERT STATEMENT
 
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Oracle SQL INSERT
Views: 28 Manachai CHANNEL
Oracle and .NET: Performance Best Practices
 
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Watch this video to find out the best practices for getting the best performance from your Oracle and .NET applications. This is a session from the Oracle Virtual Technology Summit in July 2015. Topics ====== Overview: 2:15 ODP.NET Coding Best Practices 3:25 Oracle Performance Analyzer and SQL Tuning Advisor: 22:09 Caching 30:06 ======
DB2 for z/OS Best Practice: Optimizing Insert Performance Part 1
 
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This webcast presents trade-offs made between optimizing DB2 insert for better throughput versus space reuse. It explores questions regarding inserting rows sequentially or randomly, whether to sort into clustering order and the effects of indexes on insert performance. Learn best practices for the different types of DB2 table spaces and get the details on DB2 parameters and recommended values.
Views: 1556 World of Db2
Importing Data from Excel into Oracle Database using SQL Developer 4.1
 
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One of SQL Developer’s most popular features has undergone a significant upgrade. Users can quickly define and recall delimited or Excel files to be imported to a new or existing Oracle table. Data preview and validation is provided for each column, as well as ‘best guess’ data type and date format mask mapping. This process can now be automated via the SQL Developer command line interface (SDCLI) ‘Import’ command. NOTE: This is a video only. There is no audio. 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.
JDBC Batch Transactions - High Performance Java Persistence
 
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In this episode I explain the importance of JDBC batch inserts / updates and show you how to use Java JDBC batch transactions with Preparedstatement. It has been measured that using batch transactions can provide up to a 500% performance gain depending on the database and driver. (See java-persistence-performance link at bottom). This can be critical developing low latency services and reducing precious milliseconds. If you enjoyed the video don't forget to subscribe! Till part 2! Philip Important snippet from jooq article: 10. Inserting lots of records one by one JDBC knows batching, and you should use it. Do not INSERT thousands of records one by one, re-creating a new PreparedStatement every time. If all of your records go to the same table, create a batch INSERT/UPDATE statement with a single SQL statement and multiple bind value sets. Depending on your database and database configuration, you may need to commit after a certain amount of inserted records, in order to keep the UNDO log slim. The Cure: Always batch-insert large sets of data. Java Jooq and JDBC batch transactions: https://www.jooq.org/doc/3.10/manual/sql-execution/batch-execution/ What you didnt know about JDBC batch: https://blog.jooq.org/2014/01/16/what-you-didnt-know-about-jdbc-batch/ Most efficient way to do batch inserts in jdbc: https://stackoverflow.com/questions/3784197/efficient-way-to-do-batch-inserts-with-jdbc 10 common mistakes java developers make when writing sql: https://blog.jooq.org/2013/07/30/10-common-mistakes-java-developers-make-when-writing-sql/ Java Batch performance, prepared statements: http://java-persistence-performance.blogspot.co.uk/2013/05/batch-writing-and-dynamic-vs.html Java PreparedStatement: https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html Java Add Batch: https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html#addBatch-- Java Execute Batch: https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html#executeBatch--
Views: 528 Philip Starritt
PL/SQL Tutorial 1 (Oracle): Importing data from an Excel Spreadsheet
 
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PL/SQL Tutorial 1 (Oracle): Importing data from an Excel Spreadsheet In this tutorial I show you how to import data from excel into a table in Oracle PL/SQL Developer. Source Code: https://github.com/mitchtabian/SQL-tutorials Subscribe to my Blog and YouTube channel to get notifications when new FREE coding tutorials are posted! Blog: http://www.codingwithmitch.com/
Views: 13926 CodingWithMitch
Inserting Variables into Doclets
 
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In this tutorial you learn how to insert static variables and reference variables into doclets in Enterprise Performance Reporting Cloud.
Stored Procedure Optimization Techniques
 
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Performance Tunning : Procedure : 1.Set Nocount On 2.Set Isolation level Read Uncommited / Nolock 3.Missing Indexes : 4.Scalar function 5.COvering index -- include 6.Partition . 7.Proper Index -- Column Store 9.Try to minimize Physical read 10.Fragmentation issue (Index rebuilding + Reorganizing ) 11.understand Execution planning (opertor )
Views: 17047 SqlIsEasy
Why Your MySQL Needs Redis | Redis Labs
 
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Redis is the go to solution If your application stores data in MySQL or any other relational database. This video will cover the many benefits of inserting Redis in between your application and the database. We'll cover scalability, caching, session store, and much more. Learn more about Redis Labs and Redis Enterprise. Visit our homepage https://redislabs.com/
Views: 16415 Redis Labs
PL/SQL Oracle Tutorial - BULK COLLECT - PL/SQL for beginners (Lesson 9)
 
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BULK COLLECT reduces context switches between SQL and PL/SQL engine and allows SQL engine to get many rows at once.
DB Instance Viewer in SQL Developer 4.1
 
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Visualize the status of your database in a brand new, graphical representation of the IO, wait events, storage, log switches, and processes. Requiring no server side objects, agents, or database changes, this new SQL Developer feature will shorten the amount of time it takes to diagnose ongoing performance issues. From the main page, DBAs and power users can quickly drill down into various activity reports to see the details. NOTE: This is a video only. There is no audio. 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.
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: 5579 Pretty Printed
Creating a database, table, and inserting - SQLite3 with Python 3 part 1
 
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Welcome to an SQLite mini-series! SQLite, as the name suggests, is a lite version of an SQL database. SQLite3 comes as a part of the Python 3 standard library. Databases offer, typically, a superior method of high-volume data input and output over a typical file such as a text file. SQLite is a "light" version that works based on SQL syntax. SQL is a programming language in itself, but is a very popular database language. Many websites use MySQL, for example. SQLite truly shines because it is extremely lightweight. Setting up an SQLite database is nearly instant, there is no server to set up, no users to define, and no permissions to concern yourself with. For this reason, it is often used as a developmental and protyping database, but it can and is used in production. The main issue with SQLite is that it winds up being much like any other flat-file, so high volume input/output, especially with simultaneous queries, can be problematic and slow. You may then ask, what really is the difference between a typical file and sqlite. First, SQLite will let you structure your data as a database, which can easily be queried, so you get that functionality both with adding new content and calling upon it later. Each table would likely need its own file if you were doing plain files, and SQLite is all in one. SQLite is also going to be buffering your data. A flat file will require a full load before you can start querying the full dataset, SQLite files don't work that way. Finally, edits do not require the entire file to be re-saved, it's just that part of the file. This improves performance significantly. Alright great, let's dive into some SQLite. https://pythonprogramming.net/sql-database-python-part-1-inserting-database/ Playlist: https://www.youtube.com/playlist?list=PLQVvvaa0QuDezJh0sC5CqXLKZTSKU1YNo https://pythonprogramming.net https://twitter.com/sentdex https://www.facebook.com/pythonprogramming.net/ https://plus.google.com/+sentdex
Views: 245219 sentdex
Loading Data from Excel to Oracle using SQL Developer
 
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How to quickly load data from a spreadsheet or delimited file to a new or existing table in Oracle SQL Developer. Also briefly cover using the same interface for setting up SQL*Loader runs or External (staging) Tables.
PL/SQL tutorial 3: SELECT INTO statement in PL/SQL by Manish Sharma RebellionRider
 
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How to initialize the variable by fetching values from the table of the database or by using SELECT INTO statement in PL/SQL by Manish Sharma RebellionRider ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : http://bit.ly/select-into-statement-pl-sql Previous Tutorial ► Variables: https://youtu.be/2MNmodawvnE ------------------------------------------------------------------------- ►►►Let's Get Free Uber Cab◄◄◄ Use Referral Code UberRebellionRider and get $20 free for your first ride. -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at for E-mail address please check About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 135243 Manish Sharma
Part 12   Can we join two tables without primary foreign key relation
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/09/part-12-can-we-join-two-tables-without.html Can we join two tables without primary foreign key relation Yes, we can join two tables without primary foreign key relation as long as the column values involved in the join can be converted to one type. ID column in Departments table is not the primary Key and DepartmentId column in Employees table is not the foreign key. But we can still join these tables using ID column from Departments table and DepartmentId column from Employees table, as both the columns involved in the join have same data type i.e int. Select Employees.Name as EmployeeName, Departments.Name as DepartmentName from Employees join Departments on Departments.ID = Employees.DepartmentId The obious next question is, if primary foreign key relation is not mandatory for 2 tables to be joined then what is the use of these keys? Primary key enforces uniqueness of values over one or more columns. Since ID is not a primary key in Departments table, 2 or more departments may end up having same ID value, which makes it impossible to distinguish between them based on the ID column value. Foreign key enforces referential integrity. Without foreign key constraint on DepartmentId column in Employees table, it is possible to insert a row into Employees table with a value for DepartmentId column that does not exist in Departments table. The following insert statement, successfully inserts a new Employee into Employees table whose DepartmentId is 100. But we don't have a department with ID = 100 in Departments table. This means this employee row is an orphan row, and the referential integrity is lost as result Insert into Employees values (8, 'Mary', 'Female', 80000, 100) If we have had a foreign key constraint on DepartmentId column in Employees table, the following insert statement would have failed with the following error. Msg 547, Level 16, State 0, Line 1 The INSERT statement conflicted with the FOREIGN KEY constraint. The conflict occurred in database "Sample", table "dbo.Departments", column 'ID'.
Views: 126361 kudvenkat
DB2 for z/OS Best Practice: Optimizing Insert Performance Part 2
 
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This second webcast on optimizing insert performance reviews additional techniques for speeding up the process of inserting rows into DB2. Learn about methods such as using a large index pagesize, random index keys, removing unused indexes, logging, and efficiently creating unique identifiers. The webcast covers enhancements specific to DB2 10 (such as index I/O parallelism, unique index with INCLUDE, and in-line LOBs) that impact insert performance. Finally, the presenter summarizes the best practices from both part 1 and part 2.
Views: 853 World of Db2
How To Monitor Databases on AWS Using SolarWinds Database Performance Analyzer
 
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To learn more visit: http://bit.ly/SolarWinds_DPA See how SolarWinds Database Performance Analyzer identifies SQL Server and Oracle performance issues on the AWS Cloud. Connect with SolarWinds: THWACK IT Community: http://thwack.solarwinds.com/ Facebook: https://www.facebook.com/SolarWinds Twitter: https://twitter.com/solarwinds LinkedIn: http://www.linkedin.com/company/solarwinds Instagram: http://instagram.com/solarwindsinc/ Flickr: http://www.flickr.com/photos/solarwinds_inc/ TRANSCRIPT: In this video, you will learn how SolarWinds® Database Performance Analyzer or DPA for short, can be easily deployed on Amazon® Web Services, to monitor both RDS® and EC2® database servers. In addition, you will see how to identify and resolve database performance issues having the largest impact on your applications. To deploy DPA in the cloud, simply go to the Amazon marketplace and search for SolarWinds. Click on 'Continue' to deploy the AMI. Once deployed, all the additional configurations are completed through the web browser interface. The next step will be to register your database instances to be monitored by clicking on 'Register DB Instance for Monitoring.' In this case, we have already registered an instance. Let's look at DPA to find and isolate a performance problem. A customer has just called in and complained of slowness in their order entry application. To troubleshoot, first log into DPA and review the main dashboard. This will give us a high-level overview of what is happening in our environment. It’s interesting that the order entry database (PRODOE-RDS) is showing several alarms. Let's take a closer look by drilling into that database. From the trend screen, first look to the Advice tab for any critical or warning statuses. The top 2 SQL statements which are in a critical state are especially interesting. For the first statement, the adviser is telling us that there are high amounts of blocking for this insert statement on January 20th. By drilling into that day in the trend screen, we can see a 24-hour view of the top 15 SQL statements. For our insert statement, we can quickly see that it has been running every hour with a huge spike beginning in the 9:00 am hour. By drilling into that hour, we can view the blockers tab to see who is blocking this SQL statement. Here we can see that process ID of 83 has actually been blocking many other sessions for a long time. Each of these processes have spent over half an hour trying to run this insert statement. Look at the blocker details, we can quickly identify the user and see that they were performing an update to the same table. Now we can begin work on resolving this issue. Let's look at the tuning advice for our second SQL statement in Alarm. In this case, click on the 'More' link to see all of the details about the query and then review the execution plan. Notice that the adviser is suggesting several new indexes. At this point, we can decide to create and test them to see if they help improve performance. To maximize the value that DPA delivers, 24x7 monitoring is recommended. As DPA continues to monitor and collect data, the more comprehensive the analysis becomes especially when identifying trends and anomalies over time. One surprise that many of our customers have learned, is that it's not always the best idea or cost-effective to provision large database servers in the cloud. Instead, start with a small or medium-sized installation, use DPA to monitor performance, then add more resources when you need to. Test drive DPA today, just visit www.solarwinds.com/dpa.
Views: 807 solarwindsinc
Exploring Cursor Variables in PL/SQL
 
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Cursor variables (variables declared based on a REF CURSOR type) offer some interesting advantages over "hard-coded" or explicit cursors (CURSOR my_cur IS ...), especially lots of flexibility and the ability to pass a cursor as a parameter or even the return value of a function. Highlights 01:55 Introduction to cursor variables 02:55 Why use cursor variables? 05:36 Dev Gym use of cursor variables 08:03 Diving into cursor variable syntax and usage 15:15 Q&A: how best to log and propagate exceptions up the stack 23:05 Performance impact of using cursor variables 26:05 Using cursor variables to make dynamic SQL method 4 easier 33:00 Cursor variables and cursor expressions 37:45 More Q&A 39:24 Chris’s experience with cursor variables (before joining Oracle) 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
Views: 307 Oracle Developers