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  • ORACLE-BASE - Efficient Function Calls From SQL

    In effect, calling functions in SQL statements, that internally issue SQL breaks the Oracle read consistency model. Bryn Llewellyn came to one of my presentations on efficient function calls from SQL and we had a conversation about this issue. During the conversation I asked the question, "Do you care?", which might seem strange, but we have to ...

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  • 5 different ways to test Oracle Ref Cursor results ...

    Test red cursor from SQL Developer Step 2. Click OK. Step 3. Test red cursor from SQL Developer Step 3 (In the message window you have to choose "Output variables") Conclusion :- Most of the ref cursors can be tested with either of the method. Also you can use the base query directly in SQL window or SQL plus to test the ref cursors.

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  • Query is running slow for long time for SQL_ID | Oracle ...

    Query is running slow for long time for SQL_ID captured Run SQL Tuning Adviosor for the sql_id-----Statement with SQL_ID captured is taking long time, we need to set best Execution Plan for the SQL.

    SQL Performance Analyzer in Oracle Database 11g Release 1

    SQL Performance Analyzer in Oracle Database 11g Release 1. The concept of SQL tuning sets, along with the DBMS_SQLTUNE package to manipulate them, was introduced in Oracle 10g as part of the Automatic SQL Tuning functionality. Oracle 11g makes further use of SQL tuning sets with the SQL Performance Analyzer, which compares the performance of ...

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  • How To Troubleshoot a Slow Running Query in SQL Server ...

    Nov 22, 2017· How To Troubleshoot a Slow Running Query in SQL Server Extended Events & Wait Stats (by Amit Bansal) ... SQL Server Health Check If your SQL Server deployments are not performing good or if you ...

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  • Performance Tuning - Oracle

    In this situation, Oracle can execute this query more efficiently by first doing a b-tree index range scan on the structured predicate (author = ''King''), followed by a table access by rowid, and then applying the other two predicates to the rows returned from the b-tree table access.

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  • 7 Performance Tuning - Oracle

    Answer: Additionally, the FIRST_ROWS (n) hint has a special meaning for text queries and should be used when you need the first n hits to a query. Use of the FIRST_ROWS hint in conjunction with ORDER BY SCORE (n) DESC tells Oracle Text to accept a sorted set from the text index, and not to do a .

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  • Ask TOM tracing all SQL queries which have executed when ...

    Oct 12, 2015· I need to collect all the SQL queries (SELECT, UPDATE, DELETE, INSERT) which have been used by the application when any order is processed through the application. If I can get all SQL''s for atleast 50 orders processed through the application then I can check that which SELECT, UPDATE, DELETE statements are frequently in use and which tables are being frequently used by the .

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  • Oracle SQL for Analysis and Reporting: essential training ...

    You should take this course if you are looking to up your game in database querying, data mining and business intelligence using SQL queries. A special section is dedicated to Analytic Functions, a really cool set of functions in Oracle that make it easy to write .

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  • Debugging SQL Server Performance | Jama Software

    Oct 12, 2016· To check the server configuration, you can open "System Information" view: To check SQL Server memory setting, Start SQL Server Management Studio. Right-click on your database instance and select "Properties". Click on "Memory" table in the "Server Properties" pop-up window. Check the memory settings.

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  • How to Increase the Speed of SQL Query Execution

    Feb 13, 2018· We have made a list of 17 ways that you can consider to optimize your SQL queries. Use Column Names Instead of * in a SELECT Statement. Try not to use HAVING clause in SELECT statements. Avoid using UPDATE instead of CASE. Avoid blind re-use of Code. Use an IN predicate when querying an indexed column.

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  • ORACLE MASTERMINDS: Useful SQL Queries - Oracle EBS

    Oct 31, 2014· Oracle Order Management Setup Document in R12.2; iProcurement Setup Document and it''s basic flows in R12.2; Query to retrive Internal Requisition and Internal Sales Order Details; ORACLE WORK IN PROCESS SETUP DOCUMENT IN R12.2; Fast Index Scan, Index Scan, Partition Range Scan and Full Table Scan; Project Expenditure Extraction Query

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  • How to optimize SQL Server query performance

    Performance is a big deal. No matter if we''re talking about applications in which users click buttons to display data or if we''re writing a query directly into let''s say SQL Server Management Studio (SSMS). Nobody likes to click a button, go get a coffee and hope the .

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  • Ask TOM How to identify sql query running against ... - Oracle

    How to identify sql query running against a database ... after another then in that case sql_text shows only the procedure being executed and not the internal query.How can I check the query which is executing against SQL database inside procedure and the parameters being passed to it if any? ... if you are looking for stats about sql ...

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  • 45 Useful Oracle Queries for Oracle Developers

    Jan 14, 2014· These useful oracle queries are a must know for PL/SQL developers. ... Query to check if autoextend is on or off for a given tablespace. ... Performance related queries; CPU usage of the USER Displays CPU usage for each User. Useful to understand database load by user.

    How to identify slow running queries in SQL Server

    May 31, 2017· Tools & techniques. If the table is using Key Lookup, then try to remove that lookup by adding those columns in the index which is used by the table. If number of rows returned by the query is way off as compared to number of rows returned by table operators (as highlighted in the lower section of the query plan),...

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  • Techniques for improving the performance of SQL queries ...

    Follow the SQL best practices to ensure query optimization: Index all the predicates in JOIN, WHERE, ORDER BY and GROUP BY clauses. WebSphere Commerce typically depends heavily on indexes to improve SQL performance and scalability. Without proper indexes, SQL queries can cause table scans, which causes either performance or locking problems.

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  • What are the query optimization techniques in Oracle/SQL ...

    Apr 21, 2015· In order to most effectively tune Oracle queries, you should start by identifying the queries that have the longest duration. You can accomplish this task by using Oracle SQL Profiler. Next, you analyze the queries to determine where they are spending their .

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  • Improve SQL Query Performance by Using Bind Variables ...

    Aug 27, 2015· The optimizer has the task of figuring out which table access and join methods to use. This produces an execution plan. When Oracle sends a statement to the optimizer to do this it''s called a hard parse. If a plan already exists for a query, Oracle doesn''t need to go through the optimization process again. It can reuse the existing plan.

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  • Checking for NULL with Oracle SQL - Simple Talk

    Aug 30, 2012· Checking for NULL with Oracle SQL The art of doing mathematics consists in finding that special case which contains all the germs of generality. David Hilbert One of the most mindboggling values in the Oracle database is the NULL value.

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  • On Query Tuning | Oracle Magazine

    Generate a SQL profile. A SQL profile enables the optimizer to aggressively look at a query, determine what the real cardinality estimates should be, and then remember this information in the data dictionary. The next time the query is hard-parsed, the optimizer will .

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  • See Oracle SQL execution details over time

    The dbms_xplan.display_awr allows you to input only a SQL_ID, and Oracle will show you the of the explain plans for that SQL_ID, as recorded in the AWR. This simple query will show changes to SQL explain plan history, if you have purchased the extra-cost licenses for AWR.

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  • ORACLE-BASE - Efficient SQL Statements

    The situation is further complicated by the fact that the engine may perform a Merge Join or a Nested Loop join to retrieve the data. Despite this, there are a few rules you can use to improve the performance of your SQL. Oracle processes result sets a table at a time. It starts by retrieving all the data for the first (driving) table.

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  • Step by Step: How to troubleshoot a slow running query in ...

    Apr 29, 2016· Step by Step: How to troubleshoot a slow running query in Oracle This is a day to day task of a DBA. Someone from application team comes to our desk and simply says a query .

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  • How to get the actual execution plan for an Oracle SQL ...

    Mar 06, 2018· Introduction. While answering this question on the Hibernate forum, I realized that it''s a good idea to write an article about getting the actual execution plan for an Oracle SQL query using Hibernate query hints feature.. SQL statement execution. A SQL statement only defines what needs to be selected, and not how data is going to be queried.

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  • SQL Performance Interview Questions and Answers for ...

    Ans. Optimizing SQL queries can bring substantial positive impact on the performance. It also depends on the level of RDBMS knowledge you have. Let''s now go over some of the tips for tuning SQL queries. 1. Prefer to use views and stored procedures in spite of writing long queries.

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  • How does one troubleshoot slow SQL queries? - Quora

    SQL Server takes data samples, as a fraction of the real data in a table, so the Query Optimizer can decide the best way to run a query. These small samplings of data from a .

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  • SQL Performance Analyzer in Oracle Database 11g Release 1

    SQL Performance Analyzer in Oracle Database 11g Release 1. The concept of SQL tuning sets, along with the DBMS_SQLTUNE package to manipulate them, was introduced in Oracle 10g as part of the Automatic SQL Tuning functionality. Oracle 11g makes further use of SQL tuning sets with the SQL Performance Analyzer, which compares the performance of the statements in a tuning set before .

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  • Oracle SQL PIVOT and UNPIVOT: The Complete Guide

    The PIVOT Keyword in Oracle SQL. Back to Top. Oracle has the ability to create a result set that transposes or pivots columns and rows to provide a summary. This is done using the SQL PIVOT keyword. This keyword was introduced in Oracle 11g. This keyword is applied to a SELECT statement, and looks like this:

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  • Oracle SQL tuning - Tune individual SQL statements

    In this final article in my series on Oracle tuning, I will share some general guidelines for tuning individual SQL statements to improve Oracle performance. Oracle SQL tuning goals. Oracle SQL tuning is a phenomenally complex subject. Entire books have been written about the nuances of Oracle SQL tuning; however, there are some general ...

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  • Troubleshooting stuck queries – Oracle Diagnostician

    Nov 13, 2012· SQL Monitor. If your Oracle version is 11g or higher, then the most convenient tool to deal with "stuck" queries is SQL monitor. It''s very simple in use: where are optional, and can be sql_id of the statement or session_id or other parameters that can identify the activity of .

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  • Connect to an Oracle database (Power Query) - Excel

    Click on the Data tab, then Get Data > From Database > From Oracle Database. If you don''t see the Get Data button, then click New Query > From Database > From Oracle Database. In the Power Query ribbon tab, click From Database > From Oracle Database. In the Oracle Database dialog box, in Server Name specify the Oracle Server to connect to.

    Real-Time SQL Monitoring in SQL Developer - Doug''s Oracle .

    If you haven''t seen 11g''s Real Time SQL Monitoring feature, you need to. It''s one of the most useful Oracle performance troubleshooting tools I''ve seen since I started working with Oracle too long ago. I was first aware of it via Greg Rahn''s blog post.

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