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  • Oracle????????????????????????~????????????????????

    - by Yusuke.Yamamoto
    RDBMS ???????·????????????????????????????????????????????????????????????????????????? ????????Oracle ?????????????????????????????????? Oracle Database ???????????????????????????????? ????????????????????? ????Oracle???????????????????????????????????????????????????????????????????????????? ?????????????? Oracle Database ???????????????????????? ??????????????????????????????????2????????????? 1. ??????(Query Transformation) Query Transformation ???????SQL??????????????????SQL????????????????????? Query Transformation ???Predicate Transformation ? Common Sub-expression Elimination (CSE), Order-BY Elimination (OBYE), Outer Join Elimination (OJE), Simple View Meging (SVM), Predicate Move around (PM), Complex View Merging (CVM), Sub-query Unnesting (SU), Join Predicate Push Down (JPPD) ???? OR Expansion, Star Transformation (ST) ????????????? ···???????????????????????????????????????????????????? Predicate Transformation ?????? Transitive Predicate Generation ????????????? ?????????????SQL???deptno ? 10 ????????????????????????????? select e.ename, d.loc from emp e, dept d where e.deptno=d.deptno and e.deptno=10; ???????????????emp ??? deptno=10 ??????????????dept ??? d.deptno=10 ??????????????????? emp ?? deptno=10 ????????????????????emp ?? deptno=10 ??????10???????10? dept ????????????dept ??20???????????????????????10?*20?=200?????(??????????·?????????)? ??SQL?? Transitive Predicate Generation ??????SQL????????????????? select e.ename, d.location from emp e, dept d where e.deptno=d.deptno and e.deptno=10 and d.deptno=10; ^^^^^^^^^^^ ??????dept ?????? deptno=10 ??????????????????????????10?*1?=10(dept.deptno ?unique????)?1/20????????????????1/20????????????????10??????????30???????????????Query Transformation ???????????????????????????? ?:??????????? dept ?? 1-row table ??????dept ?? driving ???(Outer Table)??? emp ?? probe ???(Inner Table)????????????1?*10?=10 ????????????????????????????????????????????????????????1/20????????????? ?????? Query Transformation ??????SQL????????????????????????????????? Transformation ??????????????????????????????????? 2. ????·????(Access Path Analysis) Access Path Analysis ??Query Transformation ??SQL????????????(Access Path)?????????(Join Method)?????(Join Order)?????????? ??????????????????(FTS)?ROWID?????????????????????????????·?????(Nested Loop Join)???????(Hash Join)????/?????(Sort Merge Join)????????????????????????????????????????????????????????????????????????? Oracle Database ????????? Query Transformation ???? Logical Optimizer?Access Path Analysis ???? Physical Optimizer ????????? ??????????????????????????????????????????????????????????????????????????????????????????????????? ????????????????????????????????????????????????????? Oracle Database ????????????????????? "Oracle ????????" ?????????? Sustaining Engineering?? ?(??? ???) ???????????????? Sustaining Engineering ????????????????????????Oracle Database ???????????????????????? ?????????????????????Ruby????????????????????????? Oracle????????????????????????! Oracle????????????? Oracle????????????????????????

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  • installing Oracle Database 10g XE Server in Ubuntu 11.04, "E: Unable to locate package oracle-xe"

    - by Nguyen Phi Vu
    I have read many posts for installing Oracle Database 10g XE Server in Ubuntu, such as this But I get an error: E: Unable to locate package oracle-xe when execute the command sudo apt-get install oracle-xe At the previous step (sudo apt-get update), it also notices that E: Some index files failed to download. They have been ignored, or old ones used instead. Did any one meet and solve this problem? I have searched for this problem but got no proper answer.

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  • Oracle Fusion Middleware with Oracle Database 12c

    - by Hiro
    Oracle Fusion Middleware ????????????????Oracle Database 12c ????????????·???????????????? Oracle WebLogic Server 11g (10.3.6) ??? Oracle Fusion Middleware 11g Release 1 (11.1.1.7.0) ?? Oracle Forms and Reports 11g Release 2 (11.1.2.1.0) ?? ??????????????·????????????????Oracle WebLogic Server ??????????My Oracle Support???Doc ID: 1564509.1 ??????????(My Oracle Support ?????????????????????) ?????

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  • ANN: ObjectDataSource and siaqodb -object database for .NET

    Siaqodb -object database for .NET, Mono and Silverlight version 1.1 (just released) fully support now ASP.NET 4.0 and by ObjectDataSource and ASP.NET Dynamic Data, building data-driven apps are faster then ever:http://siaqodb.com/?p=236...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Distributed C++ game server which use database.

    - by Slav
    Hello. My C++ turn-based game server (which uses database) does stand against current average amount of clients (players), so I want to expand it to multiple (more then one) amount of computers and databases where all clients still will remain within single game world (servers will must communicate with each other and use multiple databases). Is there some tutorials/books/common standards which explain how to do it in a best way?

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  • Basic Defensive Database Programming Techniques

    We can all recognise good-quality database code: It doesn't break with every change in the server's configuration, or on upgrade. It isn't affected by concurrent usage, or high workload. In an extract from his forthcoming book, Alex explains just how to go about producing resilient TSQL code that works, and carries on working.

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  • Exploring your database schema with SQL

    In the second part of Phil's series of articles on finding stuff (such as objects, scripts, entities, metadata) in SQL Server, he offers some scripts that should be handy for the developer faced with tracking down problem areas and potential weaknesses in a database.

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  • Basic Defensive Database Programming Techniques

    We can all recognize good-quality database code: It doesn't break with every change in the server's configuration, or on upgrade. It isn't affected by concurrent usage, or high workload. In an extract from his forthcoming book, Alex explains just how to go about producing resilient TSQL code that works, and carries on working.

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  • Rotating Oracle Database's Alert Log with ADRCI

    Many Oracle database administrators would not only like to report on (ORA-) errors but also manage the alert log itself--saving and/or trimming the alert log, aka alert log rotation. Oracle's new ADR with command interface can easily be used to help rotate Oracle's alert log.

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  • DOAG Conference 2011: Seven Flavors of Database Upgrades

    - by Mike Dietrich
    Thanks to everybody who did attend at my DOAG Conference session in Nürnberg this year "Seven Flavor of Database Upgrades" (or in German: "7 Wege zum Datenbank-Upgrade - Geschichten, die das Leben schrieb"). And thanks for your patience staying with me in overtime as well In case you'd like to download the slides I've presented at the session please download them via this link or from the download section to your right.

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  • Statistical Sampling for Verifying Database Backups

    A DBA's huge workload can start to threaten best practices for data backup and recovery, but ingenuity, and an eye for a good tactic, can usually find a way. For Tom, the revelation about a solution came from eating crabs. Statistical sampling can be brought to bear to minimize the risk of failure of an emergency database restore.

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  • Profiling Database Activity in the Entity Framework

    It’s important to profile your database queries to see what happens in response to Entity Framework queries and other data access activities, says Julie Lerman, who gives you the details on several profiling options to improve you coding. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • Jokes search engine / PHP based search engine on database

    - by matt74tm
    I'm looking for a script, functioning like the Google homepage that fetches data from a database rather than the internet. This is not intended to be a search engine, but a repository of jokes that can be pulled depending on the keywords typed. No sophisticated search techniques are required - keyword based is perfectly fine. If some mechanism of up/down-voting jokes can be incorporated, that would be fantastic, but I'm presuming that will be an entirely different game.

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  • Book Review: Defensive Database Programming With SQL Server

    It distils a great deal of practical experience; the writing of it was a considerable task; It packs in a great deal of information. Alex's book shows how to write robust database applications, and we can all learn from it. We took the book to a critic who never minces his words, and were relieved to find that Joe Celko liked it.

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  • Test-driven Database Development – Why Bother?

    Test-Driven Development is a practice that can bring many benefits, including better design, and less-buggy code, but is it relevant to database development, where the process of development tends to me much more interactive, and the culture more test-oriented? Greg reviews the support for TDD for Databases, and suggests that it is worth giving it a try for the range of advantages it can bring to team-working.

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  • SQL SERVER Generate Database Script for SQL Azure

    When talking about SQL Azure the common complain I hear is that the script generated from stand-along SQL Server database is not compatible with SQL Azure. This was true for some time for sure but not any more. If you have SQL Server 2008 R2 installed you can follow the guideline below to generate script [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Jokes search engine / PHP based search engine on database

    - by matt_tm
    I'm looking for a script, functioning like the Google homepage that fetches data from a database rather than the internet. This is not intended to be a search engine, but a repository of jokes that can be pulled depending on the keywords typed. No sophisticated search techniques are required - keyword based is perfectly fine. If some mechanism of up/down-voting jokes can be incorporated, that would be fantastic, but I'm presuming that will be an entirely different game.

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  • Efficient, partial, point-in-time database restores

    - by GavinPayneUK
    This article is about a situation that many of us could describe the theoretical approach to solving, but then struggle to understand why SQL Server wasn’t following that theoretical approach when you tried it for real. Earlier this week, I had a client ask about the best way to perform: a partial database restore, 1 of 1300 filegroups; to a specific point in time; using a differential backup, and therefore; without restoring each transaction log backup taken since the full backup. The last point...(read more)

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  • Database Security Puzzle Solving with IBM DB2 LUW Roles

    The task of keeping up with database security can sometimes be monumental! A major challenge when it comes to administering authorities and privileges is how to approach this puzzle in a sensible, time-saving, 'security robust' manner. There is no need for concern; we have a hint or two that will help solve this puzzler.

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