Best Practices for Performance Part 2 - Oracle€¢Tune bad SQL found by Oracle Performance Analyzer •Use if SQL is performing poorly under load. ... •Best Practices for Performance

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Best Practices for Performance Part 2.NET and Oracle Database

Alex KehChristian ShayProduct ManagersServer TechnologiesSeptember 19, 2016


Program Agenda

Caching

SQL Tuning Advisor

Oracle Performance Monitor

Q+A

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2

3

4

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CachingODP.NET

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Desirable Cache Characteristics

• Fast performance

• Easy to use/setup

• Minimize runtime resource usage

– Scalable for both client and server

• Up to date, accurate results

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Better Caching Solutions

• DB responsible for change notification

– DB server = the one source of truth

• Overcomes typical disadvantages

– Network traffic – more throughput• Only generates traffic if database change occurs

– Higher scalability• Only updates if change occurs and data is read

– Timing – greater accuracy• As soon as change occurs, clients receive acknowledgement

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Oracle .NET Caching Solutions

• Oracle .NET client-side DB caches

– Client Result Cache

– Continuous Query Notification (CQN) – customizable cache

– TimesTen In-Memory Database

• Automatically updates/alerts client cache upon server changes

• Each meets separate caching requirements

• Server-side caches can be used with .NET

– DB In-Memory option, server result cache, etc.

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Oracle Client Result Cache

• Automatically updating query result set cache

• Benefits

– Easy to use• No code changes required

– Snapshot consistent• Cache refreshes without user intervention

– More scalability and performance• Data retrieval from client, rather than server

• No additional round trips

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Oracle Client Result Cache Updates

1. Upon data change, client receives change notification on subsequent round trip (or max lag)

– Invalidation notifications piggyback on existing client round trips

– No changes to the cache results yet

2. Cache waits for next read to refresh results– No unnecessary DB traffic

– Defers update as late as possible

• Cache entries do not timeout

– Least Recent Used algorithm

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D E M O N S T R A T I O N

Client Result Cache


Client Result Cache

• To use cache results, the following must match

– SQL text

– Bind values

– Session settings

• Different sessions with same user settings share cache results

– Must exist in same client process

• Different users do not share the same result sets

• One cache per machine per client process

How It Caches

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Oracle Continuous Query Notification (CQN)

• Programmatic control over cache notifications and updates

• Also known as Database Change Notification

• Benefits over Client Result Cache

– More control over how cache behavior• What if multiple DB users access the same results?

• What if only a subset of the cached data is required?

• How long should a query be cached?

• Do I want additional logic executed when the cache is refreshed?

• Requires significant customization

– CQN provides cache infrastructure

More Control Over Cache Behavior

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Notification

Queue

Application

Listener

OracleCommand

OracleDependency

Data Dictionary

OnChange

Add Dependency

Execute()

Notification Request

TABLE

Data Change



CQN


When to Use These Caches

• Good use cases

– Few and mostly read-only tables

– Few rows updated for each table

– Replace app logic that checks for updates to ensure user has most up to date data

• Bad use case

– Do not use it for constantly changing data

Client Result Cache and CQN

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Oracle TimesTen In-Memory Database

• Fully featured relational database

• Oracle compatible SQL and PL/SQL

• Persistent and durable

– Transactions with ACID properties

– Flexible options for durability

• Exceptional performance– Instantaneous response time, high throughput, embeddable

• ODP.NET TimesTen provider for TimesTen DB

– Same ODP.NET APIs

Memory-Optimized Relational Database

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Oracle Performance Analyzer and SQL Tuning AdvisorOracle Developer Tools for Visual Studio

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SQL Tuning Advisor

• Included with Oracle Developer Tools for Visual Studio

• Use when designing new SQL statements

• Tune ad-hoc SQL statements in Query Window

• Tune bad SQL found by Oracle Performance Analyzer

• Use if SQL is performing poorly under load


SQL Tuning Advisor

• Requirements– ADVISOR privilege

– Oracle Database license for Oracle Diagnostic Pack

– Oracle Database license for the Oracle Tuning Pack

• How to run:– Oracle Query Window “Tune SQL” button

– Oracle Performance Monitor – Tune SQL button



SQL Tuning Advisor


Oracle Performance Analyzer

• Included with Oracle Developer Tools for Visual Studio

• Detects performance issues in an application’s use of the database under load

• Requirements– SYSDBA

– Oracle Database license for Oracle Diagnostic Pack

• Can be use during testing

• Can be also used on production applications


Oracle Performance Analyzer

• Simple to use– Run your application

– Enter amount of time to analyze

– Press Start to start timer

– Sufficient “database time” required to get results

– View findings and actions

– Implement recommended actions

– Run Oracle Performance Analyzer again until no remaining issues



Performance Analyzer


Additional Oracle .NET Resources

OTNotn.oracle.com/dotnet

Twittertwitter.com/OracleDOTNET

YouTubeyoutube.com/OracleDOTNETTeam

[email protected] and [email protected]

mailto:[email protected]

mailto:[email protected]


Upcoming .NET Sessions

• Meet the Oracle Programming and Scripting Experts – Tuesday – 6:15 PM Moscone South - 310

• Best Practices for Performance Part 2: .NET and Oracle Database– Thursday- 10:45 AM Marriott Marquis - Salon 10/11

• PL/SQL Programming for .NET Developers: Tips, Tricks, and Debugging– Thursday – 12:00 PM Marriott Marquis - Salon 10/11

• What’s New for .NET Developers in Oracle Database

– Thursday – 1:15 PM Park Central – Concordia

• Best Practices for High Availability: .NET and Oracle Database

– Thursday – 2:30 PM Park Central – Concordia


Q&A

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Safe Harbor Statement

The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.

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Best Practices for Performance Part 2 - Oracle€¢Tune bad SQL found by Oracle Performance Analyzer •Use if SQL is performing poorly under load. ... •Best Practices for Performance