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Vendor : Oracle
Exam Code : 1Z0-117
Exam Name : Oracle Database 11g Release 2- SQL Tuning
Questions and Answers : 125 Q & A
Updated On : December 17, 2018
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1Z0-117 Questions and Answers

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1Z0-117 Oracle Database 11g Release 2- SQL Tuning

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1Z0-117 exam Dumps Source : Oracle Database 11g Release 2- SQL Tuning

Test Code : 1Z0-117
Test Name : Oracle Database 11g Release 2- SQL Tuning
Vendor Name : Oracle
Q&A : 125 Real Questions

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Oracle Oracle Database 11g Release

Upgrading to Oracle Database 11g | killexams.com Real Questions and Pass4sure dumps

Bob Bryla and Kevin Loney

@46975 here's an excerpt from Chapter 2 of the publication "Oracle Database 11g DBA handbook" by using Bob Bryla and Kevin Loney, copyright 2008 from Oracle Press, a division of McGraw-Hill. click on right here to download the total chapter.

if you have in the past installed an earlier version of the Oracle database server, that you could improve your database to Oracle Database 11g. dissimilar upgrade paths are supported; the appropriate choice for you will rely upon factors corresponding to your current Oracle software edition and your database dimension. during this chapter, you will see descriptions of those strategies along with guidelines for their use.

if you have not used a version of Oracle previous to Oracle Database 11g you could pass this chapter for now. youngsters, you're going to doubtless deserve to check with it when you improve from Oracle Database 11g to a later version or in the event you migrate records from a different database into your database.

just before starting the improve, you should read the Oracle Database 11g setting up ebook on your operating device. A successful installing is elegant on a properly configured ambiance—together with working system patch tiers and system parameter settings. Plan to get the installing and upgrade correct the first time rather than trying to restart a in part a success installing. Configure the system to support each the installing of the Oracle software and the creation of a usable starter database.

This chapter assumes that your setting up of the Oracle Database 11g application (see Chapter 1 and the appendix titled "installing and Configuration") completed efficaciously and that you have an Oracle database that uses an previous version of the Oracle software on the same server. observe that whether you're installing from scratch or upgrading a previous edition of the Oracle Database, there are distinct merits to installing the Oracle Database 11g application and creating the database in separate steps. When installing from scratch, you've got more suitable manage over initialization parameters, database file places, reminiscence allocation, etc if you create the database in a separate step; when upgrading from a old release, setting up the software first provides you with the Oracle Pre-improve assistance tool that you just use towards the present database to provide you with a warning to any skills compatibility complications if you upgrade to Oracle Database 11g . To upgrade that database, you've got four alternate options:

  • Use the Database improve Assistant (DBUA) to ebook and operate the improve in vicinity. The old database will turn into an Oracle 11g database all through this procedure. DBUA helps each Oracle precise application Clusters (RAC) and automated Storage management (ASM); that you could launch DBUA as part of the installation system or as a standalone device after installing. Oracle strongly recommend using DBUA for Oracle Database primary releases or patch unencumber improvements.
  • function a guide upgrade of the database. The old database will turn into an Oracle 11g database during this system. when you have very specific manage over each step of the process, this formula is greater at risk of error if you pass over a step or neglect a prerequisite step.
  • Use the Export and Import (or Oracle information Pump) utilities to movement facts from an prior version of Oracle to the Oracle 11g database. Two separate databases will be used—the historic database as the source for the export and the new database because the target for the import. when you are upgrading from Oracle Database 10g , you are going to use Oracle data Pump to movement your facts from the ancient database to the brand new database.
  • replica facts from an past version of Oracle to an Oracle 11g database. Two separate databases might be used—the historical database because the supply for the copy and the new database because the target for the reproduction. This components is the most straightforward because your migration consists basically of create table as select SQL statements referencing the old and newdatabases; youngsters, until your database has very few tables and also you aren't involved with the use of existing SQL tuning sets, facts, etc, Oracle does not recommend this formula for production databases.

    Upgrading a database in vicinity—by the use of either the Database upgrade Assistant or the guide improve path—is called an immediate upgrade. as a result of a direct improve doesn't contain creating a second database for the one being upgraded, it can comprehensive faster and require much less disk area than an indirect upgrade.

  • note  Direct upgrade of the database to edition 11 is simply supported in case your existing database is using one of those releases of Oracle: 9.2.0.4, 10.1.0.2, or 10.2.0.1. if you're the usage of every other liberate, you are going to first need to improve the database to one of those releases or you will deserve to use a unique improve choice. Oracle eight.0.6 is barely supported for some models (often 64-bit), so be sure to investigate the on-line certification matrixes at Oracle's Metalink site or in the Oracle Database improve e book.
  • observe  Plan your enhancements carefully; you may need to enable time for assorted incremental upgrades (akin to from 8.1.7 to eight.1.7.four to 9.2.0.eight) prior to upgrading to Oracle Database 11g .
  • continue studying this chapter through  downloading a free .pdf of Upgrading to Oracle Database 11g from the Oracle Database 11g DBA instruction manual .


    Will self reliant Database Entice big business to the Cloud? | killexams.com Real Questions and Pass4sure dumps

    In Andy Mendelsohn’s line of work, people inform him their information problems and their hope and fears for relocating to the cloud.

    Mendelsohn, Oracle’s govt vice chairman for database server technologies, hears from CIOs beneath the gun on statistics safety, IT managers pushed to reduce charges and carry services faster, and DBAs overworked on these IT groups. however when the cure of cloud computing comes up, these equal americans would hesitate. The merits, it appeared, didn’t yet outweigh the chance of relocating simple IT operations to the cloud at loads of massive groups.

    Andy Mendelsohn, Oracle’s executive vp for database server technologies, says independent know-how is resonating at each degree of company.Oracle

    currently, youngsters, Mendelsohn has seen a shift. “as soon as we all started providing independent database technology,” in March of this yr, he says, people are searching up from their daily grind and asking a lot of questions.

    “the entire clients I consult with tell me they intention to be records-pushed, and that facts is the important thing asset for their business,” Mendelsohn says. “in order they modernize their infrastructure and movement workloads to a cloud atmosphere, I remind them to seem previous vanilla compute and storage,” and start to think extra ambitiously about what the cloud can do for them. Mendelsohn shared his insights from the Oracle OpenWorld leading stage.

    Oracle’s self sustaining database starts with the core Oracle Database expertise that hundreds of heaps of organizations use to manipulate their statistics. The self reliant skill makes it self-riding, self-securing, self-repairing, and designed to eliminate error-inclined manual records management. It makes it effortless to installation new databases or flow current transaction-processing databases and data warehouses to a magnificent and scalable cloud, so valued clientele can beginning getting greater price from their data.

    “We’ve hit on whatever thing that’s resonating” with all tiers of the company, Mendelsohn says.

    as an instance, “CIOs love how it can lessen their charge and risk,” he says. “The self-driving database service takes over management of all of the infrastructure, that can decrease all their fees.”

    “and they like that its self-securing,” because it always scans for threats and anomalies and applies patches without a downtime. “The CIO in fact doesn’t want to have to reply to the board of administrators about why their firm didn't have the newest patches applied, and that’s how the hackers obtained in and stole the data,” he says.

    and finally, a self-repairing self reliant database maintains crucial techniques up and working all the time. “We’re going decide to that, and give the CIO actual SLAs” (service stage agreements) devoid of the entire caveats that other cloud suppliers insert, he says.

    developers and statistics analysts like that they could do their work on a magnificent information management infrastructure, launching new ability in minutes with no need to ask database consultants to set anything else up. And DBAs can now get greater concerned in shooting price out of the records, with less time spent on patching and upgrading. “here's the DBA's chance to turn into much more effective to their company,” Mendelsohn says.

    simplest Oracle

    The self sustaining capabilities are a essential success, in keeping with analyst company IDC in a fresh file. “Such performance is tough to obtain within the database realm,” writes Carl Olofson, research vp for facts administration application research at IDC, “as a result of databases are so complicated, with many factors that have an effect on operation and efficiency.”

    indeed, the successful delivery of autonomous database know-how comes as the result of years of work, says Mendelsohn. “An self sufficient database service doesn’t just seem out of nowhere” like a shiny new app, he says. “It’s now not like we do some coding and voila, we’re in creation. We’re constructing on technology that we’ve been constructing for, in some instances, over 20 years.”

    those technologies include Oracle Exadata, a mature infrastructure designed exceptionally to run Oracle Database–which was just pegged with the aid of Gartner as a frontrunner in operational database administration and tops especially surveyed databases in important capabilities for operational database management techniques.

    “we now have a huge number of customers the usage of Exadata on premises. And in case you appear at the greatest 100 groups on earth, many of them at the moment are running Exadata in the Oracle cloud,” Mendelsohn says.

    The mixture of Exadata on Oracle Cloud and the newest unencumber of Oracle Database 18c are at the coronary heart of both self sufficient database services in the Oracle cloud, the self reliant facts Warehouse, and Oracle Transaction Processing Database.

    With self sustaining statistics Warehouse, Oracle Database is configured for operating massively parallel query workloads and is wholly self-tuning. “This system is a true load-and-go device,” Mendelsohn says. as soon as a data architect creates an information model, “your analysts simply load the information and begin querying the database.” The administration and tuning are sorted, and it scales automatically—up or down—should you desire it to. “in case your analysts go home for the weekend they can take down the compute to zero and simply pay us for storing the statistics,” Mendelsohn says. “If there’s a huge workload you must do to shut your books on the conclusion of the quarter, you can scale up from 16 to 32 CPUs or something you want.”

    The self sufficient transaction processing database handles any type of combined workloads, including transactions and analytics, batch processing, reporting, and so on. It offers the entire skill of that Exadata infrastructure and database infrastructure, however hides the complexity of it.

    “We’ve received a simple means so that you can take present on-premises statistics for your Oracle Databases, and flow it to a modern cloud environment where your database is self-using, self-securing, and self-repairing,” Mendelsohn says. So, he asks: “if you’re using Oracle Databases today to manage and give protection to your entire most essential information, why no longer select Oracle as your strategic associate for facts administration within the cloud?”

    Disclaimer:  The preceding is intended to define our established product path. it's meant for information functions best, and might not be included into any contract. It isn't a dedication to convey any material, code, or performance, and should not be relied upon in making procuring selections. The building, unencumber, timing, and pricing of any features or performance described for Oracle’s products may also trade and remains at the sole discretion of Oracle corporation.


    Oracle accelerates information Insights for dealers with Oracle Digital Assistant | killexams.com Real Questions and Pass4sure dumps

    REDWOOD SHORES, Calif., Nov. 15, 2018 /PRNewswire/ -- Enabling retailers to build customized customer experiences in addition to voice-enabled assistants to help employees work smarter and greater productively, Oracle Retail solutions at the moment are integrated with Oracle Digital Assistant. collectively, these choices empower agents to locate answers to critical business questions comparable to, "what's the existing margin on our new BOGO present for trendsetters?" faster than ever before.

    announced at Oracle OpenWorld 2018, Oracle Digital Assistant leverages synthetic-intelligence (AI) to take into account context, derive intent, and determine and gain knowledge of consumer behaviors and patterns to automate events projects proactively on behalf of the person. with the aid of integrating the know-how with Oracle Retail present Optimization Cloud provider, analysts can conveniently streamline region-selected earnings forecasting, promotional deployment and efficiency, approval automation and target prioritization.

    to peer these technologies in action, discuss with: https://youtu.be/UcDTQa7Ff-w

    "Most sellers feel about conversational AI in the context of the shop or e-commerce, although, sellers can now practice conversational AI to their core operations, via voice or textual content, to accelerate productivity and optimize processes," said Mike Webster, Senior vice chairman and normal supervisor, Oracle Retail. "sensible digital interactions are a vital part of our ordinary life as we question Alexa, Google home and Siri for thoughts. This newest integration between Oracle Digital Assistant and Oracle Retail offer Optimization Cloud provider brings the power and simplicity of voice to retail operations, dashing time to insight and action."

    constructed on Oracle Cloud Infrastructure, Oracle Digital Assistant goes neatly beyond typical chatbots available today that give simple, single professional, linear responses. by means of applying AI for herbal language processing (NLP), herbal language figuring out (NLU) and machine discovering (ML), Oracle is uniquely placed to leverage its breadth and depth in business functions to present a digital assistant that may in fact span the business.

    "Going forward digital assistants will transform how retailers, planners, and marketers collaborate, have interaction their enterprise's suggestions property, and how they work," noted Greg Girard, software director of intelligent product merchandising and marketing, IDC Retail Insights. "As digital assistants become greater conversationally and analytically skillful and more aware about their clients' intent and context we are going to see more incisive choices, made quicker, to carry enhanced business effects. agents should carry digital assistants into their digital transformation planning assumptions now."

    In April, Oracle launched the next generation of promoting, markdown and offer optimization capabilities as a cloud service with the launch of Oracle Retail present Optimization Cloud carrier. With these new updates marketers can analyze merchandising and pricing choices for the complete product lifecycle while presenting patrons with targeted and contextual offers.

    About OracleThe Oracle Cloud presents complete SaaS application suites for ERP, HCM and CX, plus finest-in-type database Platform as a provider (PaaS) and Infrastructure as a provider (IaaS) from information facilities all over the Americas, Europe and Asia. For greater assistance about Oracle ORCL, +0.60% please discuss with us at www.oracle.com.

    About Oracle RetailOracle gives dealers with an entire, open, and integrated suite of superior-of-breed enterprise functions, cloud functions, and hardware that are engineered to work together and empower commerce. leading trend, grocery, and strong point marketers use Oracle solutions to assume market alterations, simplify operations and inspire genuine company interactions. For extra suggestions, talk over with our web site at www.oracle.com/retail.

    TrademarksOracle and Java are registered trademarks of Oracle and/or its associates. different names could be logos of their respective owners.

    View original content to down load multimedia:http://www.prnewswire.com/information-releases/oracle-quickens-information-insights-for-dealers-with-oracle-digital-assistant-300750921.html

    source Oracle

    Copyright (C) 2018 PR Newswire. All rights reserved


    1Z0-117 Oracle Database 11g Release 2- SQL Tuning

    Study Guide Prepared by Killexams.com Oracle Dumps Experts


    Killexams.com 1Z0-117 Dumps and Real Questions

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    1Z0-117 exam Dumps Source : Oracle Database 11g Release 2- SQL Tuning

    Test Code : 1Z0-117
    Test Name : Oracle Database 11g Release 2- SQL Tuning
    Vendor Name : Oracle
    Q&A : 125 Real Questions

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    Oracle Database 11g Release 2- SQL Tuning

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    Oracle 1Z0-117: An SQL Tuning Challenge | killexams.com real questions and Pass4sure dumps

    Written by Matthew Morris Published: 16 May 2013

    Page 1 of 2

    The Oracle Certified Expert - SQL Tuning certification has no training requirement or prequisite certification -- if you pass the 1Z0-117 exam, physician the expert designation is yours. That said, passing this exam is easier said than done.

    1Z0-117: Oracle Database 11g Release 2: SQL Tuning is an exam in the Oracle Expert series that leads to the “Oracle Database 11g Release 2 SQL Tuning” OCE certification. At this time it is also the newest expert certification to be made available from Oracle Education. Tuning SQL in an Oracle database is both an important and potentially complex task. Creating a new certification for this skill is an excellent move on Oracle’s part and there has been a great deal of interest from the Oracle community in this exam becoming production. The topics on 1Z0-117 cover the base concepts, techniques, and tools that allow you to detect, diagnose, and resolve problems with poor SQL performance.

    Oracle already has a server tuning Expert certification available: Oracle Database 11g Performance Tuning Certified Expert. It requires candidates to either hold a DBA OCP or to take a hands-on training course in addition to passing the exam (1Z0-054). The SQL Tuning expert certification, on the other hand, has no training or certification requirement -- if you pass the 1Z0-117 exam, the expert designation is yours. That said, passing this exam is easier said than done.

    When I took it, the exam had been out of beta for only ten days. This may account for why it felt to me like it still had some of the ‘rough edges’ that I associate with a beta exam. A handful of questions had what I felt were problems with the wording of the question, the answers, or both. I have reported what I could recall of these to Oracle Education. If the exam developers agree that the items I reported were truly flaws, hopefully they will be resolved shortly. On the morning of the test, I really did not need peculiar questions interfering with my concentration. The questions that I understood clearly were strenuous enough.

    At 150 minutes, this is the longest non-beta Oracle test I’ve ever taken. You will have almost two full minutes to answer each question and many are complex enough to need that time. A clear majority of the questions that I had were multiple-answer rather than multiple-choice, further increasing the overall difficulty. It is much easier to pick a single right answer than two, three, or four right answers – especially when there is no partial credit.

    The test covers a wide range of topics on SQL tuning:

  • SQL Tuning and Diagnosis Tools
  • Understanding and Interpreting Execution Plans
  • Working with the Oracle Optimizer and Statistics
  • Bind Variables, Bind Peeking, and Adaptive Cursor Sharing
  • Using the SQL Tuning and SQL Access Advisors
  • SQL Plan Management
  • Utilizing Optimizer Hints
  • Implementing Parallel Execution
  • Data Warehousing

  • Oracle(R) SQL Developer 3.0 Enables Improved Database Developer Productivity | killexams.com real questions and Pass4sure dumps

    REDWOOD SHORES, CA--(Marketwire - 04/14/11) - Oracle (NASDAQ:ORCL - News)News Facts

  • To further ease and improve Oracle® Database developer productivity, Oracle today announced the availability of Oracle SQL Developer 3.0.
  • Based on customer feedback, this new release focuses on ease of migration, improving development and database administrator (DBA) tasks, and introduces support for Oracle Data Mining and Oracle Spatial.
  • A free graphical tool for database development, Oracle SQL Developer Release 3.0 is downloadable today from the Oracle Technology Network (OTN).
  • New Capabilities Extend Oracle SQL Developer Appeal to Broader Audience

  • Comprehensive and lightweight, Oracle SQL Developer 3.0 introduces new and enhanced usability features that help improve the productivity of DBAs and developers of all experience levels, including:
  • Enterprise Migrations - introduces command line scriptable migrations enabling automation;
  • Application Scanning - introduces scanning of source code for Sybase ctlib/dblib APIs;
  • Database Navigator - offers DBAs and developers a simple entry point to browse and update a database, including configuration and storage files, security for profiles, roles and users, and more;
  • DBMS Scheduler - this new graphical editor helps users create, manage and plan programs, schedules, jobs and a variety of other objects;
  • SQL Tuning Advisor - this code advisor analyzes high-volume SQL statements and offers tuning recommendations to developers writing queries;
  • Explain Plan Diff - enables developers to run and compare queries and review Explain Plans side-by-side; and,
  • Query Builder - offers developers a simple to use drag and drop interface for building queries.
  • The new Oracle Data Miner extension for Oracle SQL Developer 3.0 is a workflow based graphical user interface for data mining that enables data analysts to build and evaluate multiple data mining models, apply models to new data and enable predictive insights across the enterprise.
  • The new spatial data management feature provides an SQL schema and functions that facilitate the storage, retrieval, update, and query of collections of spatial features in Oracle Database 11g enabling users to visualize query results in a map view. In addition, users can display layers on a map depending on the queries executed as well as drag and drop tables onto a map for quick display.
  • Oracle SQL Developer previously introduced an Oracle TimesTen In-Memory Database extension helping developers generate reports, perform group cache operations, manage users, browse and compile PL/SQL packages, procedures and functions, update table and column statistics and create, edit and drop a wider range of database objects.
  • Based on customer feedback, Oracle SQL Developer 3.0 delivers an upgraded migration workbench that improves the developer experience to help customers and partners simplify and reduce the cost of migrating to Oracle Database 11g.
  • To guide migration, developers can run project estimation and server reports, produce data quality metrics, drill into potential conversion issues and then use an interactive wizard that supports all phases of migration.
  • This new release embeds Oracle SQL Developer Data Modeler 3.0 to enable developers to open, view, and now update designs developed previously as well as query, run and write reports against the reporting repository.
  • Oracle SQL Developer is supported through My Oracle Support with any Oracle Database license and runs on Windows, Linux and Mac OS X.
  • Supporting Quotes "For accessing the Oracle TimesTen In-Memory Database, Oracle SQL Developer 3.0 delivers great enhancements over the previous version by providing a convenient interface for some basic administration tasks like statistics update, adding and removing users, and manipulating cache groups, synonyms, among other features," said Krishnaswamy Balakrishnan, Manager, Database Engineering, Barnes & Noble. "In addition, it's a great tool for developers to test and compile their PL/SQL code.""Oracle SQL Developer is great for us because it gives us the open API we need to create our own features, and it gives us a great market reach advantage because so many people use it," said Cary Millsap, President, Method R Corporation. "Oracle's standard channel for distributing our extension makes it very easy for our customers and us to do business together.""Leveraging the mass popularity of Oracle SQL Developer, we are releasing our new Oracle Data Miner 11g Release 2," said Cetin Ozbutun, vice president, Data Warehouse, Oracle. "With Oracle Data Mining, the data, models and predictive analytics never leave the database enabling significantly more functionality, security, performance and scalability at a lower total cost of ownership. In addition, when used with Oracle Exadata, data mining models built with Oracle Data Miner are pushed to storage for execution, providing even better scalability."Supporting ResourcesAbout Oracle SQL DeveloperAbout Oracle Data MiningAbout Oracle Spatial 11gAbout Oracle TimesTen In-Memory DatabaseAbout Oracle Database 11gRead Oracle SQL Developer 3.0 Data SheetOracle Expert Blogs: Sue Harper and Kris RiceOracle Forum: SQL DeveloperConnect with Oracle Database via Blog, Facebook and TwitterDownload Oracle SQL Developer 3.0. Terms, conditions and restrictions apply.About OracleOracle (NASDAQ:ORCL - News) is the world's most complete, open, and integrated business software and hardware systems company. For more information about Oracle, please visit our Web site at http://www.oracle.com.Trademarks Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners.


    Query Tuning for Developer, Beginner DBAs | killexams.com real questions and Pass4sure dumps

    This chapter focuses on specific queries that you may encounter and some general information for tuning those specific queries, but it has also been updated to include some basic information on Oracle’s 11g Automatic SQL Tuning and some queries to access Oracle’s 11g Automatic Workload Repository (AWR). Examples of query tuning are spread throughout this book as well as instructions on making them more effective in terms of your system’s architecture. This chapter centers on some of the most common queries that can be tuned on most systems. A query can display several variations in behavior, depending on system architecture, the data distribution in the tables, what tool or application is accessing the database, the specific version of Oracle Database, and a variety of other exceptions to the rules. Your results will vary; use your own testing to come up with the most favorable performance. The goal in this chapter is to show you many of the issues to watch for and how to fix them. 

    This chapter uses strictly cost-based examples for timings (except where noted). No other queries were performed at the time of the tests performed for this chapter. Many hints are also used throughout this chapter. For a detailed look at hints and the syntax and structure of hints, please refer to Chapter 7. Multiple table and complex queries are the focus of the next chapter and are not covered here. 

    Please note that this is not an all-inclusive chapter. Many other queries are covered throughout the book, which need to be investigated when trying to increase performance for a given query. Some of the most dramatic include using the parallel features of Oracle Database (Chapter 11), using partitioned tables and indexes (Chapter 2), and using PL/SQL to improve performance (Chapter 10). Note the benefits of using EXPLAIN and TRACE for queries (Chapter 6). Oracle Database 11g provides the Automatic Workload Repository (AWR) and Automatic Database Diagnostic Monitor (ADDM). The Enterprise Manager views of these new features are shown in Chapter 5. Tips covered in this chapter include the following:

  • What queries do I tune? Querying the V$SQLAREA and V$SQL views
  • Some useful new 11g views for locating resource-intensive sessions and queries
  • When should I use an index?
  • What if I forget the index?
  • Creating and checking an index
  • What if I create a bad index?
  • Exercising caution when dropping an index
  • Using invisible indexes
  • Function based indexes and virtual columns
  • Increasing performance by indexing the SELECT and WHERE columns
  • Using the Fast Full Scan feature to guarantee success
  • Making queries "magically" faster
  • Caching a table into memory
  • Using the new 11g Result Cache
  • Choosing between multiple indexes on a table (use the most selective)
  • Indexes that can get suppressed
  • Tuning OR Clauses
  • Using the EXISTS clause and the nested subquery
  • That table is a view!
  • SQL and the Grand Unified Theory
  • Automatic SQL Tuning and the SQL Tuning Advisor
  • Using the SQL Performance Analyzer (SPA)
  • What Queries Do I Tune? Querying V$SQLAREA and V$SQL Views

    V$SQLAREA and V$SQL are great views that you can query to find the worst-performing SQL statements that need to be optimized. The value in the DISK_READS column signifies the volume of disk reads that are being performed on the system. 

    This, combined with the executions (DISK_READS/EXECUTIONS), return the SQL statements that have the most disk hits per statement execution. Any statement that makes the top of this list is most likely a problem query that needs to be tuned. The AWR Report or Statspack Report also lists the resource-intensive queries; see Chapter 14 for detailed information.

    Selecting from the V$SQLAREA View to Find the Worst Queries

    The following query can be used to find the worst queries in your database. This query alone is worth the price of this book if you’ve not heard of V$SQLAREA yet. 

    To find the worst queries:

    select b.username username, a.disk_reads reads,a.executions exec, a.disk_reads /decode(a.executions, 0, 1,a.executions) rds_exec_ratio,a.sql_text Statementfrom V$sqlarea a, dba_users bwhere a.parsing_user_id = b.user_idand a.disk_reads > 100000order by a.disk_reads desc;USERNAME READS EXEC RDS_EXEC_RATIO STATEMENT-------- ------- ----- --------------- ------------------------------------------------------------------------ADHOC1 7281934 1 7281934 select custno, ordnofrom cust, orders

    ADHOC5 4230044 4 1057511 select ordnofrom orders where trunc(ordno) = 721305ADHOC1 801716 2 400858 select custno,ordno from cust where substr(custno,1,6) = '314159'

    The DISK_READS column in the preceding statement can be replaced with the BUFFER_GETS column to provide information on SQL statements requiring the largest amount of memory.

    Now consider the output in a second example where there is a count of a billion-row table (EMP3) and a count of what was originally a 130M row table (EMP2), where all of the rows in EMP2, except the first 15 rows inserted, were deleted. Note that Oracle counts all the way up to the high water mark (HWM) of EMP2 (it read over 800,000, 8K blocks even though all of the data was only in 1 block). This listing would have told you something is wrong with the query on EMP2 that needs to be addressed, given that it only has 15 rows in it (analyzing the table will not improve this).

    USERNAME READS EXEC RDS_EXEC_RATIO STATEMENT-------- ------- ----- --------------- -------------------------SCOTT 5875532 1 5875532 select count(*) from emp3SCOTT 800065 1 800065 select count(*) from emp2

    For this issue, if the EMP2 table was completely empty, you could simply truncate the tableto fix it. Since the table still has 15 rows, you have a few options; which option you choosedepends on your unique situation. I can

  • EXPORT/TRUNCATE/IMPORT; CREATE TABLE emp2b AS SELECT * FROM emp2 (CTAS) and then DROP and RENAME (I have to worry about indexes/related objects, etc.)
  • Do an “ALTER TABLE emp2 MOVE TABLESPACE new1” and rebuild the indexes.
  • If it has a primary key, use DBMS_REDEFINITION.CAN_REDEF_TABLE to verify that the table can be redefined online.
  • Please check the Oracle documentation for syntax/advantages/disadvantages and stipulations (not all are listed here) for each of these options, so you can apply the best option to your situation (each of these options have major downsides, including users not being able to access the table and related objects getting dropped depending on which you use, so be careful). Once I reorganize the table, the next count(*)only reads 1 block instead of 800,065 blocks (it was well worth fixing the problem). Note in the query, I change “emp2” to emP2” so I can find that cursor in the cache.

    alter table emp2 move; -- You can specify a tablespaceselect count(*)from emP2;select b.username username, a.disk_reads reads,a.executions exec, a.disk_reads /decode(a.executions, 0, 1,a.executions) rds_exec_ratio,a.sql_text Statement

    from V$sqlarea a, dba_users bwhere a.parsing_user_id = b.user_idand a.sql_text like '%emP2%'order by a.disk_reads desc;USERNAME READS EXEC RDS_EXEC_RATIO STATEMENT-------- ------- ----- --------------- ---------------------SCOTT 1 1 1 select count(*) from emP2

    You can also shrink space in a table, index-organized table, index, partition, subpartition,materialized view, or materialized view log. You do this using ALTER TABLE, ALTER INDEX,ALTER MATERIALIZED VIEW, or ALTER MATERIALIZED VIEW LOG statement with the SHRINK SPACE clause. See the Oracle Administrators Guide for additional information. Lastly, if you want to use the “ALTER TABLE table MOVE TABLESPACE tablespace_name” command, consider using the same size tablespace (or smaller if appropriate) to move things “back and forth” so as not to waste space.

    TIP

    Query V$SQLAREA to find your problem queries that need to be tuned.

    ABOUT THE AUTHOR

    Richard Niemiec is chief executive officer of TUSC, an Inc. 500 full-service consulting and training company specializing in Oracle technology. Rich has been named by Oracle Corporation as an Oracle Certified Master--one of only six originally so recognized around the world. He is the former president of the Independent Oracle Users Group (IOUG) and president of the Midwest Oracle Users Group. Rich has been named the Top Speaker of the IOUG Conference five times and is a member of the Entrepreneurial Hall of Fame.



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    References :


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    Oracle 1Z0-117 Exam (Oracle Database 11g Release 2- SQL Tuning) Detailed Information



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