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• Oracle Exadata?????????? ??1

  - by takashi.hitomi

  2009?7?~2010?5????Oracle Exadata???????????????? 2010?4?15? ???? ???????????? ? ??????Exadata V2??????????????????????? 2010?4?13? ???? ??????????? ? ?????????????????????????? 2010?4?6? ?????·???????·??????? ? T???????????????????????????????????? 2010?3?1? ?????? ????? ?????????????????????????????????????? 2010?2?2? ???? ????????? ? ??????????????Intel???????????????Sun Oracle Database Machine??????? 2010?1?26? ???? ????(????·???) ? ?Oracle Exadata??????????·??????????????????????? 2009?7?14? ?????????? ? ???????????HP Oracle Database Machine????

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• Conflict resolution for two-way sync

  - by K.Steff

  How do you manage two-way synchronization between a 'main' database server and many 'secondary' servers, in particular conflict resolution, assuming a connection is not always available? For example, I have an mobile app that uses CoreData as the 'database' on the iOS and I'd like to allow users to edit the contents without Internet connection. In the same time, this information is available on a website the devices will connect to. What do I do if/when the data on the two DB servers is in conflict? (I refer to CoreData as a DB server, though I am aware it is something slightly different.) Are there any general strategies for dealing with this sort of issue? These are the options I can think of: 1. Always use the client-side data as higher-priority 2. Same for server-side 3. Try to resolve conflicts by marking each field's edit timestamp and taking the latest edit Though I'm certain the 3rd option will open room for some devastating data corruption. I'm aware that the CAP theorem concerns this, but I only want eventual consistency, so it doesn't rule it out completely, right? Related question: Best practice patterns for two-way data synchronization. The second answer to this question says it probably can't be done.

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• Storing revisions of a document

  - by dev.e.loper

  This is a follow up question to my original question. I'm thinking of going with generating diffs and storing those diffs in the database 'History' table. I'm using diff-match-patch library to generate what is called a 'patch'. On every save, I compare previous and new version and generate this patch. The patch could be used to generate a document at specific point in time. My dilemma is how to store this data. Should I: a Insert a new database record for every patch? b. Store these patches in javascript array and store that array in history table. So there is only one db History record for document with an array of all the patches. Concerns with: a. Too many db records generated. Will be slow and CPU intensive to query. b. Only one record. If record is somehow corrupted/deleted. Entire revision history is gone. I'm looking for suggestions, concerns with either approach.

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• PHP website Optimization

  - by ana

  I have a high traffic website and I need make sure my site is fast enough to display my pages to everyone rapidly. I searched on Google many articles about speed and optimization and here's what I found: Cache the page Save it to the disk Caching the page in memory: This is very fast but if I need to change the content of my page I have to remove it from cache and then re-save the file on the disk. Save it to disk This is very easy to maintain but every time the page is accessed I have to read on the disk. Which method should I go with? Thanks

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• Performance optimization strategies of last resort?

  - by jerryjvl

  There are plenty of performance questions on this site already, but it occurs to me that almost all are very problem-specific and fairly narrow. And almost all repeat the advice to avoid premature optimization. Let's assume: the code already is working correctly the algorithms chosen are already optimal for the circumstances of the problem the code has been measured, and the offending routines have been isolated all attempts to optimize will also be measured to ensure they do not make matters worse What I am looking for here is strategies and tricks to squeeze out up to the last few percent in a critical algorithm when there is nothing else left to do but whatever it takes. Ideally, try to make answers language agnostic, and indicate any down-sides to the suggested strategies where applicable. I'll add a reply with my own initial suggestions, and look forward to whatever else the SO community can think of.

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• Does MATLAB perform tail call optimization?

  - by Shea Levy

  I've recently learned Haskell, and am trying to carry the pure functional style over to my other code when possible. An important aspect of this is treating all variables as immutable, i.e. constants. In order to do so, many computations that would be implemented using loops in an imperative style have to be performed using recursion, which typically incurs a memory penalty due to the allocation a new stack frame for each function call. In the special case of a tail call (where the return value of a called function is immediately returned to the callee's caller), however, this penalty can be bypassed by a process called tail call optimization (in one method, this can be done by essentially replacing a call with a jmp after setting up the stack properly). Does MATLAB perform TCO by default, or is there a way to tell it to?

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• Including associations optimization in Rails

  - by Vitaly

  Hey, I'm looking for help with Ruby optimization regarding loading of associations on demand. This is simplified example. I have 3 models: Post, Comment, User. References are: Post has many comments and Comment has reference to User (:author). Now when I go to the post page, I expect to see post body + all comments (and their respective authors names). This requires following 2 queries: select * from Post -- to get post data (1 row) select * from Comment inner join User -- to get comment + usernames (N rows) In the code I have: Post.find(params[:id], :include => { :comments => [:author] } But it doesn't work as expected: as I see in the back end, there're still N+1 hits (some of them are cached though). How can I optimize that?

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• why optimization does not happen?

  - by aaa

  hi. I have C/C++ code, that looks like this: static int function(double *I) { int n = 0; // more instructions, loops, for (int i; ...; ++i) n += fabs(I[i] > tolerance); return n; } function(I); // return value is not used. compiler inlines function, however it does not optimize out n manipulations. I would expect compiler is able to recognize that value is never used as rhs only. Is there some side effect, which prevents optimization? Thanks

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• How much faster is a database running in RAM?

  - by orokusaki

  I"m looking to run PostgreSQL in RAM for performance enhancement. The database isn't more than 1GB and shouldn't ever grow to more than 5GB. Is it worth doing? Are there any benchmarks out there? Is it buggy? My second major concern is: How easy is it to back things up when it's running purely in RAM. Is this just like using RAM as tier 1 HD, or is it much more complicated?

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• Static variable for optimization

  - by keithjgrant

  I'm wondering if I can use a static variable for optimization: public function Bar() { static $i = moderatelyExpensiveFunctionCall(); if ($i) { return something(); } else { return somethingElse(); } } I know that once $i is initialized, it won't be changed by by that line of code on successive calls to Bar(). I assume this means that moderatelyExpensiveFunctionCall() won't be evaluated every time I call, but I'd like to know for certain. Once PHP sees a static variable that has been initialized, does it skip over that line of code? In other words, is this going to optimize my execution time if I make a lot of calls to Bar(), or am I wasting my time?

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• Copy method optimization in compilers

  - by Dženan

  Hi All! I have the following code: void Stack::operator =(Stack &rhs) { //do the actual copying } Stack::Stack(Stack &rhs) //copy-constructor { top=NULL; //initialize this as an empty stack (which it is) *this=rhs; //invoke assignment operator } Stack& Stack::CopyStack() { return *this; //this statement will invoke copy contructor } It is being used like this: unsigned Stack::count() { unsigned c=0; Stack copy=CopyStack(); while (!copy.empty()) { copy.pop(); c++; } return c; } Removing reference symbol from declaration of CopyStack (returning a copy instead of reference) makes no difference in visual studio 2008 (with respect to number of times copying is invoked). I guess it gets optimized away - normally it should first make a copy for the return value, then call assignment operator once more to assign it to variable sc. What is your experience with this sort of optimization in different compilers? Regards, Dženan

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• Common optimization rules

  - by mafutrct

  This is a dangerous question, so let me try to phrase it correctly. Premature optimization is the root of all evil, but if you know you need it, there is a basic set of rules that should be considered. This set is what I'm wondering about. For instance, imagine you got a list of a few thousand items. How do you look up an item with a specific, unique ID? Of course, you simply use a Dictionary to map the ID to the item. And if you know that there is a setting stored in a database that is required all the time, you simply cache it instead of issuing a database request hundred times a second. I guess there are a few even more basic ideas. I am specifically not looking for "don't do it, for experts: don't do it yet" or "use a profiler" answers, but for really simple, general hints. If you feel this is an argumentative question, you probably misunderstood my intention.

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• Big Data – Buzz Words: Importance of Relational Database in Big Data World – Day 9 of 21

  - by Pinal Dave

  In yesterday’s blog post we learned what is HDFS. In this article we will take a quick look at the importance of the Relational Database in Big Data world. A Big Question? Here are a few questions I often received since the beginning of the Big Data Series - Does the relational database have no space in the story of the Big Data? Does relational database is no longer relevant as Big Data is evolving? Is relational database not capable to handle Big Data? Is it true that one no longer has to learn about relational data if Big Data is the final destination? Well, every single time when I hear that one person wants to learn about Big Data and is no longer interested in learning about relational database, I find it as a bit far stretched. I am not here to give ambiguous answers of It Depends. I am personally very clear that one who is aspiring to become Big Data Scientist or Big Data Expert they should learn about relational database. NoSQL Movement The reason for the NoSQL Movement in recent time was because of the two important advantages of the NoSQL databases. Performance Flexible Schema In personal experience I have found that when I use NoSQL I have found both of the above listed advantages when I use NoSQL database. There are instances when I found relational database too much restrictive when my data is unstructured as well as they have in the datatype which my Relational Database does not support. It is the same case when I have found that NoSQL solution performing much better than relational databases. I must say that I am a big fan of NoSQL solutions in the recent times but I have also seen occasions and situations where relational database is still perfect fit even though the database is growing increasingly as well have all the symptoms of the big data. Situations in Relational Database Outperforms Adhoc reporting is the one of the most common scenarios where NoSQL is does not have optimal solution. For example reporting queries often needs to aggregate based on the columns which are not indexed as well are built while the report is running, in this kind of scenario NoSQL databases (document database stores, distributed key value stores) database often does not perform well. In the case of the ad-hoc reporting I have often found it is much easier to work with relational databases. SQL is the most popular computer language of all the time. I have been using it for almost over 10 years and I feel that I will be using it for a long time in future. There are plenty of the tools, connectors and awareness of the SQL language in the industry. Pretty much every programming language has a written drivers for the SQL language and most of the developers have learned this language during their school/college time. In many cases, writing query based on SQL is much easier than writing queries in NoSQL supported languages. I believe this is the current situation but in the future this situation can reverse when No SQL query languages are equally popular. ACID (Atomicity Consistency Isolation Durability) – Not all the NoSQL solutions offers ACID compliant language. There are always situations (for example banking transactions, eCommerce shopping carts etc.) where if there is no ACID the operations can be invalid as well database integrity can be at risk. Even though the data volume indeed qualify as a Big Data there are always operations in the application which absolutely needs ACID compliance matured language. The Mixed Bag I have often heard argument that all the big social media sites now a days have moved away from Relational Database. Actually this is not entirely true. While researching about Big Data and Relational Database, I have found that many of the popular social media sites uses Big Data solutions along with Relational Database. Many are using relational databases to deliver the results to end user on the run time and many still uses a relational database as their major backbone. Here are a few examples: Facebook uses MySQL to display the timeline. (Reference Link) Twitter uses MySQL. (Reference Link) Tumblr uses Sharded MySQL (Reference Link) Wikipedia uses MySQL for data storage. (Reference Link) There are many for prominent organizations which are running large scale applications uses relational database along with various Big Data frameworks to satisfy their various business needs. Summary I believe that RDBMS is like a vanilla ice cream. Everybody loves it and everybody has it. NoSQL and other solutions are like chocolate ice cream or custom ice cream – there is a huge base which loves them and wants them but not every ice cream maker can make it just right  for everyone’s taste. No matter how fancy an ice cream store is there is always plain vanilla ice cream available there. Just like the same, there are always cases and situations in the Big Data’s story where traditional relational database is the part of the whole story. In the real world scenarios there will be always the case when there will be need of the relational database concepts and its ideology. It is extremely important to accept relational database as one of the key components of the Big Data instead of treating it as a substandard technology. Ray of Hope – NewSQL In this module we discussed that there are places where we need ACID compliance from our Big Data application and NoSQL will not support that out of box. There is a new termed coined for the application/tool which supports most of the properties of the traditional RDBMS and supports Big Data infrastructure – NewSQL. Tomorrow In tomorrow’s blog post we will discuss about NewSQL. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Big Data, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Which isometric angles can be mirrored (and otherwise transformed) for optimization?

  - by Tom

  I am working on a basic isometric game, and am struggling to find the correct mirrors. Mirror can be any form of transform. I have managed to get SE out of SW, by scaling the sprite on X axis by -1. Same applies for NE angle. Something is bugging me, that I should be able to also mirror N to S, but I cannot manage to pull this one off. Am I just too sleepy and trying to do the impossible, or a basic -1 scale on Y axis is not enough? What are the common used mirror table for optimizing 8 angle (N, NE, E, SE, S, SW, W, NW) isometric sprites?

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• When should an API favour optimization over readability and ease-of-use?

  - by jmlane

  I am in the process of designing a small library, where one of my design goals is to use as much of the native domain language as possible in the API. While doing so, I've noticed that there are some cases in the API outline where a more intuitive, readable attribute/method call requires some functionally unnecessary encapsulation. Since the final product will not necessarily require high performance, I am unconcerned about making the decision to favour ease-of-use in my current project over the most efficient implementation of the code in question. I know not to assume readability and ease-of-use are paramount in all expected use-cases, such as when performance is required. I would like to know if there are more general reasons that argue for an API design preferring (marginally) more efficient implementations?

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• When should code favour optimization over readability and ease-of-use?

  - by jmlane

  I am in the process of designing a small library, where one of my design goals is that the API should be as close to the domain language as possible. While working on the design, I've noticed that there are some cases in the code where a more intuitive, readable attribute/method call requires some functionally unnecessary encapsulation. Since the final product will not necessarily require high performance, I am unconcerned about making the decision to favour ease-of-use in my current project over the most efficient implementation of the code in question. I know not to assume readability and ease-of-use are paramount in all expected use-cases, such as when performance is required. I would like to know if there are more general reasons that argue for a design preferring more efficient implementations—even if only marginally so?

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• How do I have multiple schemas per database connection in Eclipse DTP?

  - by David Rabinowitz

  I'm using the Eclipse DTP to do my SQL development. When I create a database connection I'm promoted to enter the name of the database (schema), and I cannot continue until I enter it. However, I have several databases on each server, and I want to see them all under the database connection (like most the database tools let you). Can I do it in eclipse?

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• Sql Server 2005 database lost, How to recover all records. MDF/LDF size is same as it should be

  - by Shantanu Gupta

  Few months back, I installed a sql server 2005 on one of my client machine. I gave him a backup option to take backup timely but he never took any backup. Today he called me that "i m not able to see any record of mine." I visited at my clients system and saw that none of the record was present on the tables. There was not even a single row in any of the tables. Then I checked if he has any backup file which i found to be absent. I asked him the reason what could be the possible cause. He said it might be due to virus. After this I checked the size of mdf and ldf file and found it should be what it is. when i created his server mdf ldf file had 2MB of database now it is 83 MB and 193Mb mdf/ldf respectively. This shows the data is still present in it but it is not being displayed. What could be the possible cause and how can i restore all data back to my tables ?

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• Is there any reason not to go directly from client-side Javascript to a database?

  - by Chris Smith

  So, let's say I'm going to build a Stack Exchange clone and I decide to use something like CouchDB as my backend store. If I use their built-in authentication and database-level authorization, is there any reason not to allow the client-side Javascript to write directly to the publicly available CouchDB server? Since this is basically a CRUD application and the business logic consists of "Only the author can edit their post" I don't see much of a need to have a layer between the client-side stuff and the database. I would simply use validation on the CouchDB side to make sure someone isn't putting in garbage data and make sure that permissions are set properly so that users can only read their own _user data. The rendering would be done client-side by something like AngularJS. In essence you could just have a CouchDB server and a bunch of "static" pages and you're good to go. You wouldn't need any kind of server-side processing, just something that could serve up the HTML pages. Opening my database up to the world seems wrong, but in this scenario I can't think of why as long as permissions are set properly. It goes against my instinct as a web developer, but I can't think of a good reason. So, why is this a bad idea? EDIT: Looks like there is a similar discussion here: Writing Web "server less" applications EDIT: Awesome discussion so far, and I appreciate everyone's feedback! I feel like I should add a few generic assumptions instead of calling out CouchDB and AngularJS specifically. So let's assume that: The database can authenticate users directly from its hidden store All database communication would happen over SSL Data validation can (but maybe shouldn't?) be handled by the database The only authorization we care about other than admin functions is someone only being allowed to edit their own post We're perfectly fine with everyone being able to read all data (EXCEPT user records which may contain password hashes) Administrative functions would be restricted by database authorization No one can add themselves to an administrator role The database is relatively easy to scale There is little to no true business logic; this is a basic CRUD app

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• Can knowing C actually hurt the code you write in higher level languages?

  - by Jurily

  The question seems settled, beaten to death even. Smart people have said smart things on the subject. To be a really good programmer, you need to know C. Or do you? I was enlightened twice this week. The first one made me realize that my assumptions don't go further than my knowledge behind them, and given the complexity of software running on my machine, that's almost non-existent. But what really drove it home was this Slashdot comment: The end result is that I notice the many naive ways in which traditional C "bare metal" programmers assume that higher level languages are implemented. They make bad "optimization" decisions in projects they influence, because they have no idea how a compiler works or how different a good runtime system may be from the naive macro-assembler model they understand. Then it hit me: C is just one more abstraction, like all others. Even the CPU itself is only an abstraction! I've just never seen it break, because I don't have the tools to measure it. I'm confused. Has my mind been mutilated beyond recovery, like Dijkstra said about BASIC? Am I living in a constant state of premature optimization? Is there hope for me, now that I realized I know nothing about anything? Is there anything to know, even? And why is it so fascinating, that everything I've written in the last five years might have been fundamentally wrong? To sum it up: is there any value in knowing more than the API docs tell me? EDIT: Made CW. Of course this also means now you must post examples of the interpreter/runtime optimizing better than we do :)

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• E-Business Suite Certified with DB 11.2.0.2 on HP-UX Itanium and IBM AIX on Power

  - by Steven Chan

  As a follow-on to our previous certification announcement, Oracle Database 11g Release 2 (11.2.0.2) s now certified with Oracle E-Business Suite Release 12 (12.0.x and 12.1.x) and 11i (11.5.10.2 + ATG PF.H RUP 6 and higher) on the following additional platforms:Oracle E-Business Suite Release 12HP-UX Itanium (11.31) IBM AIX on Power Systems (64-bit) (5.3, 6.1) Oracle E-Business Suite Release 11iIBM AIX on Power Systems (64-bit) (5.3, 6.1)

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• EBS 11i and R12 certified with DB 11gR2 11.2.0.1 on Windows

  - by Steven Chan

  Oracle Database 11g Release 2 (11gR2) version 11.2.0.1 is now certified with Oracle E-Business Suite 11i and 12 on the following Microsoft Windows Server (32-bit) and Windows x64 (64-bit) operating systems:Windows Server 2003 (32-bit and 64-bit) Windows Server 2003 R2 (32-bit and 64-bit)Windows Server 2008 (32-bit and 64-bit)Windows Server 2008 R2 (64-bit only)Certified EBS ReleasesOracle E-Business Suite Release 11.5.10.2Oracle E-Business Suite Release 12.0.4 or higherOracle E-Business Suite Release  12.1.1 or higher

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• OTN ???? ?????? ???????

  - by Yusuke.Yamamoto

  Database ?? Database ??????? Database ?????????? Java WebLogic Server/????????·???? SOA/BPM/????? ???????/???? ID??/?????? ?????EPM/BI EPM/BI ??????? EPM/BI ???? OS/??? ???? ????? MySQL Database ?? ???? ?? ????????? ??? ?? ORACLE MASTER??Master??ORACLE MASTER Bronze?Bronze DBA11g? ??(WMV)??(MP4)2011/6/22 ORACLE MASTER??Master??ORACLE MASTER Bronze?11g SQL??????(WMV)??(MP4)2011/3/9 ORACLE MASTER??Master??ORACLE MASTER Silver?Silver DBA11g???(WMV)??(MP4)2010/3/2 ORACLE MASTER??Master??ORACLE MASTER Silver?Silver DBA11g?[10g-11g???] ??(WMV)??(MP4)2012/4/23 ORACLE MASTER??Master??ORACLE MASTER Gold DBA11g ??(WMV)??(MP4)2011/2/23 ORACLE MASTER??Master??ORACLE MASTER Gold ?Gold DBA11g ????[??]??(WMV)??(MP4)2012/4/23 ORACLE MASTER??Master??30?????? ORACLE MASTER??????(WMV)??(MP4)2012/9/3 Oracle Database???????????????!Oracle??????????!???(WMV)??(MP4)2010/9/8 Oracle Database???????????????????!? Oracle?? ?????(WMV)??(MP4)2011/4/13 Oracle Database???????????????????!? Oracle?? ??????????(WMV)??(MP4)2011/4/20 Oracle Database???????????????????????????!? ??????????-?????(WMV)??(MP4)2012/2/20 Oracle Database???????????????????????????!? ??????????-?????(WMV)??(MP4)2012/2/20 Oracle Database????????????60???????!?????????????·???????? ??(WMV)??(MP4)2011/5/17 Oracle Database???Step by Step?????!? Oracle Database 11g -?????????-??(WMV)??(MP4)2009/12/17 Oracle Database???Step by Step?????!? OracleDatabase11g -???????????(WMV)??(MP4)2009/12/24 Oracle Database???Step by Step?????!? Oracle Database 11g -?????????(WMV)??(MP4)2009/12/10 Oracle Database DBA?????????????????!???????????(WMV)??(MP4)2010/12/21 Oracle Database DBA?????????????????!????????·??????????(WMV)??(MP4)2010/11/16 Oracle Database DBA?????????????????!???????·????????(WMV)??(MP4)2010/12/15 Oracle Database DBA?????????????????!???????????(WMV)??(MP4)2010/7/21 Oracle Database DBA?????????????????!?Export/Import?????(WMV)??(MP4)2010/9/8 Oracle Database DBA??????????????????!??????????????(WMV)??(MP4)2011/7/20 Oracle Database DBA?????????·????????!!????????!?????????SQL????????(WMV)??(MP4)2010/11/24 Oracle Database DBA?????????·?????????SQL????????????!SQL????????(WMV)??(MP4)2012/1/23 Oracle Database DBA?????????·????????!!???????·??????~DiskI/O?????????~??(WMV)??(MP4)2011/3/9 Oracle Database DBA?????????·????????!!???????·??????~SQL???????~??(WMV)??(MP4)2011/9/20 Oracle Database DBA?????????·????????!???????·??????-Statspack??-??(WMV)??(MP4)2010/7/28 Oracle Database DBA?????????·????????!!???????·??????~??????????~??(WMV)??(MP4)2010/8/4 Oracle Database DBA?????????·????????!!???????·??????-?????????-??(WMV)??(MP4)2010/7/14 Oracle Database DBA?????????·?????? ??!????????????? ??????(WMV)??(MP4)2010/7/7 Oracle Database DBA?????????·????????!????????????? ??????(WMV)??(MP4)2010/7/7 Oracle Database DBA?????????·????????!! ????????DB ??????Tips??(WMV)??(MP4)2010/8/5 Oracle Database DBA??????????!!??????~Oracle Database???~??(WMV)??(MP4)2010/8/31 Oracle Database DBA??????????!!??????~OracleDatabase????~??(WMV)??(MP4)2010/8/24 Oracle Database DBA???????????????????????????????????????(WMV)??(MP4)2010/4/27 Oracle Database DBA????????&?????????????·???? - ?????RMAN??????(WMV)??(MP4)2010/10/13 Oracle Database DBA????????&???????!!??????·????-???????????-??(WMV)??(MP4)2010/9/8 Oracle Database DBA????????&???????!??????·???? ~?????? VS RMAN ?????????~??(WMV)??(MP4)2012/1/23 Oracle Database DBA????????&???????!??????·???? ~????????????~??(WMV)??(MP4)2011/7/27 Oracle Database DBA????????&?????????????????-???????????????????(WMV)??(MP4)2010/10/6 Oracle Database Developer??????????????? Oracle SQL????(WMV)??(MP4)2010/10/20 Oracle Database Developer??????????????? Oracle PL/SQL????(WMV)??(MP4)2012/1/23 Oracle Database Developer????????!!PL/SQL????????(WMV)??(MP4)2011/03 Oracle Database Developer?????????????????????(WMV)??(MP4)2011/5/25 Oracle Database Developer??Java??java???!??(WMV)??(MP4)2009/11/26 Database ??????? ???? ?? ????????? ??? ?? DB???????????????!Oracle Database????????(WMV)??(MP4)2010/5/12 DB???????????????????? Oracle Enterprise Manager??(WMV)??(MP4)2012/1/23 DB??????????!Oracle Enterprise Manager???????????????? ??(WMV)??(MP4)2012/1/23 DB??????????!Oracle Enterprise Manager??????????????·?????? ??(WMV)??(MP4)2012/1/23 DB?????????????(UX)????????????????????(WMV)??(MP4)2011/4/6 DB???????????????????????????????Oracle Enterprise Manager??????!??(WMV)??(MP4)2012/1/23 DB???JP1??????????????????????!JP1???????????(WMV)??(MP4)2011/6/9 DB???JP1JP1???????!DB????????·??????!??(WMV)??(MP4)2011/1/12 DB???SAP"SAP on Oracle Database"???Tips??(WMV)??(MP4)2011/1/12 DB?????????????????! Oracle Database ????????(WMV)??(MP4)2012/1/23 DB?????????Web????????? ~????????~??(WMV)??(MP4)2010/3/10 DB?????????Web??????? ~????????????????????????~??(WMV)??(MP4)2010/2/3 DB??????????Oracle Database Upgrade?????(WMV)??(MP4)2011/9/20 DB??????????Oracle Database Client??????????????(WMV)??(MP4)2011/4/26 DB??????????Oracle Database 11g Release 2????????????????? ??(WMV)??(MP4)2012/1/23 DB?????????????!Oracle???????????????????????????(WMV)??(MP4)2011/1/18 DB???PL/SQLPL/SQL??????? ????(WMV)??(MP4)2012/1/23 DB???PL/SQLPL/SQL??????? ????(WMV)??(MP4)2012/1/23 DB???SQL DeveloperOracle SQL Developer????????????????(WMV)??(MP4)2012/1/23 DB???Jdeveloper??IDE Oracle JDeveloper??????????????????(WMV)??(MP4)2012/1/23 DB???APEX?????????!!APEX??????????????(WMV)??(MP4)2011/4/13 DB???APEX????!60??????Web??????????(WMV)??(MP4)2011/3/3 DB???APEXOracle??????????????! APEX4.0??????(WMV)??(MP4)2011/2/9 DB???APEX?????!????????!Oracle APEX???????????(WMV)??(MP4)2011/6/23 DB???Large Object??·???????DB????? -LOB???????-??(WMV)??(MP4)2010/2/4 DB???XMLOracle Database???????XML???????(WMV)??(MP4)2011/3/16 DB???XML??????XML?? - ?????! XML??? -??(WMV)??(MP4)2010/8/18 DB???XML??????XML?? - Oracle????XML -??(WMV)??(MP4)2010/8/25 DB???????SQL?????!Oracle Database????????Oracle Text???????(WMV)??(MP4) - DB???Oracle Data Guard??!Oracle Data Guard ????????????????????(WMV)??(MP4)2012/1/23 DB???Oracle Real Application Clusters??!?????????? ~RAC???~??(WMV)??(MP4)2012/1/23 DB???Oracle Real Application Clusters??!?????????? ~RAC??? ~??(WMV)??(MP4)2012/1/23 DB???Oracle Real Application Clusters??!Oracle RAC????????????????????????(WMV)??(MP4)2012/1/23 DB???Oracle Real Application Clusters??????!RAC????????????(WMV)??(MP4)2012/1/23 DB???Oracle Real Application Clusters?????????????!!60?????RAC????(WMV)??(MP4)2010/12/8 DB???????????????????????????!!?Oracle Database Firewall? ??(WMV)??(MP4)2012/1/23 DB?????????Oracle Database Firewall??????????? ??(WMV)??(MP4)2012/5/14 DB?????????????????????????????????????????(WMV)??(MP4)2011/5/11 DB??????????????????????????????????????(WMV)??(MP4)2011/4/19 DB????????????????! ???????????????(WMV)??(MP4)2012/1/23 DB?????????????????????????????????(WMV)??(MP4)2010/11/16 DB???????????????????????????????????????????????(WMV)??(MP4)2011/2/9 DB???????????????~???????~??(WMV)??(MP4)2010/12/22 DB???????????????~????/????????~??(WMV)??(MP4)2011/5/24 DB??????Oracle VM 3.0 ???????(WMV)??(MP4)2011/10/3 DB??????????????BCP/BCM???Oracle??????????(WMV)??(MP4)2011/7/13 DB???????????????????????????????????????(WMV)??(MP4)2011/7/12 DB????????DB??????????!??????? Oracle ????????????? ??(WMV)??(MP4)2012/1/23 DB??????????????????!?????????????????(WMV)??(MP4)2011/6/22 DB??????????????????????(WMV)??(MP4)2011/10/17 DB???????????????????????????(WMV)??(MP4)2011/10/17 DB????????????????~?????????????????IT????~??(WMV)??(MP4)2009/12/22 DB??????????!???????? ~????????????????~??(WMV)??(MP4)2011/11/1 DB???????????????????? -???????????(WMV)??(MP4)2011/6/21 DB????????20?????? Oracle GoldenGate??(WMV)??(MP4)2012/4/23 DB????????Oracle GoldenGate?????????????(WMV)??(MP4)2012/5/14 DB???????????????????????????!Oracle GoldenGate??????(WMV)??(MP4)2011/11/1 DB???????????????????!GoldenGate????DB?????????(WMV)??(MP4)2011/8/24 DB????????????????????????? Oracle GoldenGate ????????????! ??(WMV)??(MP4)2012/1/23 DB???????? ??????????????????????????????(WMV)??(MP4)2011/03 DB???????????????!! Oracle Data Integrator??????????(WMV)??(MP4)2009/12/17 DB??????????!??????????????????????(WMV)??(MP4)2011/4/6 DB???????????????????????Oracle Database ????? ????(WMV)??(MP4)2012/1/23 DB???????????????????????Oracle Database ????? ????(WMV)??(MP4)2012/1/23 DB????????????!??????·??????????????????(WMV)??(MP4)2012/1/23 DB???Oracle Partitioning??!????????????????? ????(WMV)??(MP4)2012/1/23 DB???Oracle Partitioning??!????????????????? ????(WMV)??(MP4)2012/1/23 DB?????????????????!SQL?????????? ??(WMV)??(MP4)2010/12/21 DB???Exadata20?????? Oracle Exadata??(WMV)??(MP4)2012/4/23 DB???ExadataOracle Exadata??????????????????(WMV)??(MP4)2012/5/14 DB???Exadata????!Oracle Exadata????? ??(WMV)??(MP4)2011/10/17 DB???ExadataOracle Exadata????????????????????????? ??(WMV)??(MP4)2012/1/23 DB?????????DB?????DB????????????????? -Oracle TimesTen ????-??(WMV)??(MP4)2012/1/23 DB?????????DBWeb????????????!????????????????(WMV)??(MP4)2010/11/4 DB????????DBA?"???????" ????????????????(WMV)??(MP4)2010/8/25 DB?????????????!?Oracle ASM??????????????(WMV)??(MP4)2011/7/8 DB????????Oracle ASM ? Oracle Clusterware ??????????? ??(WMV)??(MP4)2012/1/23 DB????????????????????????????????? - Oracle ASM Cluster File System (ACFS)????! ??(WMV)??(MP4)2012/1/23 DB??????????????????/????·????????Flashback Database with SSD???(WMV)??(MP4)2011/10/17 DB???????????????????DB??????~RAC VM with SSD??(WMV)??(MP4)2011/1/11 DB????????Oracle???????????? SSD?????!??(WMV)??(MP4)2010/8/11 DB??????????????NAS??????!Oracle Database?I/O???????NFS????????????SSD?????????????(WMV)??(MP4)2012/1/23 DB????????????! ???????????? ~????·???????????????~??(WMV)??(MP4)2009/3/25 DB??????????!???????????????????(WMV)??(MP4)2011/3/15 DB???????????????????????!??????·?????????(WMV)??(MP4)2010/6/23 Windows/.Net?????????Oracle on Windows-???? OVM,Hyper-V????(WMV)??(MP4)2011/4/13 Windows/.Net????????Windows Server?Oracle?????!??(WMV)??(MP4)2010/5/19 Windows/.Net????????Oracle on Windows - ??????&???? ?????(WMV)??(MP4)2011/4/20 Windows/.Net??????.Net.NET + Oracle Database ??????????????????????(WMV)??(MP4)2012/1/23 Windows/.Net??????.Net.NET????????Oracle Database ??(WMV)??(MP4)2011/1/20 Windows/.Net??????.NetOracle on Windows-.NET+Oracle ???????(WMV)??(MP4)2011/6/28 Windows/.Net??????.NetVB6????.NET? ~DB????????????~??(WMV)??(MP4)2010/8/4 Windows/.Net??????.Net.NET+Oracle ???????????????????(WMV)??(MP4)2011/10/3 Windows/.Net??????Active Directory30????!Active Directory+Oracle??(WMV)??(MP4)2010/9/8 Windows/.Net??????AccessAccess????WEB?????????????????????????(WMV)??(MP4)2011/7/20 Windows/.Net??????Oracle Real Application ClustersWindows?RAC??!????????????(WMV)??(MP4)2010/9/1 Windows/.Net????????????Oracle on Windows ~???????~ ??(WMV)??(MP4)2011/1/18 Windows/.Net????????????Oracle on Windows ~???????~ ??(WMV)??(MP4)2011/1/20 Windows/.Net???????????MSCS????!?Windows+Oracle????????(WMV)??(MP4)2010/8/4 ???????11gR2???????!Oracle DB 11g???????/??????(WMV)??(MP4)2011/4/14 ???????11gR2???! Oracle Database 11g R2 ?????????(WMV)??(MP4)2010/11/17 ???????11gR2DB??????·??????????11g R2?????(WMV)??(MP4)2010/9/15 ????????????????DWH????????????????·??????????(WMV)??(MP4)2010/11/25 ????????????????DWH????????????????·??????????(WMV)??(MP4)2010/11/25 ????????????????DWH????????????????·??????????(WMV)??(MP4)2010/11/25 Database ?????????? ???? ?? ????????? ??? ?? Oracle Master Platinum??Oracle Real Application Clusters?Platinum???????Platinum???!?????? Oracle RAC ?????????(WMV)??(MP4)2010/1/26 Oracle Master Platinum??????????Platinum??????? Platinum???!???????Oracle??????????????(WMV)??(MP4)2010/4/21 Oracle Master Platinum????????Platinum??:?????????????????????(WMV)??(MP4)2010/5/26 Oracle Master Platinum????????·?????Platinum??????? Platinum???! ????????????·?????????(WMV)??(MP4)2010/3/9 ????????????????????????????!?????????&?????????(WMV)??(MP4)2012/1/23 ????????????????????????????!SQL????????? ??? Part1&2??(WMV)??(MP4)2010/10/12 ????????????????????????????!SQL????????? ??? Part3 ??(WMV)??(MP4)2010/10/19 ????????????????????????????!SQL????????? ??? Part4 ??(WMV)??(MP4)2011/1/27 ????????????????????????????!SQL????????? ??? Part5 ??(WMV)??(MP4)2011/1/27 ????????????????????????????!?????????????????????(WMV)??(MP4)2012/1/23 ????????????????????????????!????????? Part1 ??(WMV)??(MP4) - ????????????????????????????!????????? Part2 ??(WMV)??(MP4)2011/7/26 ????????????????????????????!????????? Part3 ??(WMV)??(MP4)2010/4/28 ????????????????????????????!??????? Part1 ??(WMV)??(MP4)2011/11/1 ????????????????????????????????????????? Part2 ??(WMV)??(MP4)2012/5/28 ????????????????????????????!???????????????????????????? ??(WMV)??(MP4)2012/1/23 ??????????????????????????!??????? Part1 ??(WMV)??(MP4)2011/2/10 ??????????????????????????!??????? Part2 ??(WMV)??(MP4)2011/3/23 ??????????????????????????!??????? Part3 ??(WMV)??(MP4)2011/4/26 ??????????????????????????!??????? Part4 ??(WMV)??(MP4)2011/5/26 ???????????Exadata???????????!Exadata???????????????????Tips??(WMV)??(MP4)2012/1/23 ?????????????????DB???????????!??TimesTen?????????? ??(WMV)??(MP4)2012/1/23 ???????????????????????????!GoldenGate?????????????????????(WMV)??(MP4)2012/1/23 ???????????EDA/CEP???????????!Oracle CEP?????????·?????????????(WMV)??(MP4)2012/1/23 ????????????????????????????????!???????????????????(WMV)??(MP4)2011/2/15 ???????????????????????????????RAC ????????????????(WMV)??(MP4)2012/1/23 ????????????????????????????????!Oracle Net ??????????????(WMV)??(MP4)2012/1/23 ?????????????????????????????:???????????????0??????(WMV)??(MP4)2010/5/19 ???????????????????????????!???????????????????????(WMV)??(MP4)2012/1/23 ?????????Oracle Real Application Clusters????????????!RAC????????????????????(WMV)??(MP4)2011/3/1 ???????Core Tech Oracle Database Core Tech SeminarOracle Data Guard,Oracle Recovery Manager(RMAN),Flashback??(WMV)??(MP4)2012/5/14 ???????Core Tech Oracle Database Core Tech SeminarOracle Real Application Clusters,Oracle Clusterware,Oracle Automatic Storage Management??(WMV)??(MP4)2012/5/14 ???????Big Data Appliance?????????????????????(WMV)??(MP4)2012/5/14 ???????Oracle Real Application ClustersRAC????10??!US Oracle??????????????Oracle Real Application Clusters????????????(WMV)??(MP4)2012/2/20 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ???????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ???????/?????????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12c Oracle Enterprise Manager 12c ???????/????????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ??????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ??????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ????????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ????????? ????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c Exadata?????(WMV)??(MP4)2012/1/23 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager 12c ???????????(WMV)??(MP4)2012/2/6 ???????Oracle Enterprise Manager 12cOracle Enterprise Manager???????????·?????????????(WMV)??(MP4)2012/5/14 ???????Database Appliance???????????1Box?????2???????? Oracle Database Appliance ??????(WMV)??(MP4)2011/12/19 ???????Database ApplianceOracle Database Appliance????????·????????(WMV)??(MP4)2012/5/14 ???????Oracle Data MiningOracle DB????!????????????(WMV)??(MP4)2010/9/14 ???????Oracle Data MiningOracleDB????????????(WMV)??(MP4)2011/6/29 OracleDirect ?????????????????!?????·???????ABC -Oracle Database???(WMV)??(MP4)2012/3/5 OracleDirect ???????????????????????-SE·EE??????-??(WMV)??(MP4)2010/5/19 OracleDirect ?????????????Oracle Database EE?SE???????????!???(WMV)??(MP4)2010/2/25 OracleDirect ????????????????98(????)???Oracle Database?????????! ~?????????????Oracle Database?????!~??(WMV)??(MP4)2009/12/2 OracleDirect ????????????!! Oracle Database????????(WMV)??(MP4)2010/10/13 OracleDirect ?????SQL?????????SQL?????????!SQL?????(WMV)??(MP4)2011/4/12 ???????????ACE????? ??Oracle Database???????(WMV)??(MP4)2012/5/14 ???????????????????????????????????????????? ??(WMV)??(MP4)2012/1/23 ????????????????!?????????????????·???????????? ????(WMV)??(MP4)2012/1/23 ????????????????!?????????????????·???????????? ????(WMV)??(MP4)2012/1/23 Java ???? ?? ????????? ??? ?? Java??Java EEJava EE 6 ??(132page)??(WMV)??(MP4)2011/04 Java?????!???????Java?????????(WMV)??(MP4)2011/06 Java??Java???????·???????????(WMV)??(MP4)2012/01 Java??Oracle ???? Java ??????? ??(WMV)??(MP4)2011/03 WebLogic Server/????????·???? ???? ?? ????????? ??? ?? WebLogic Server????Oracle????????WebLogic ????(WMV)??(MP4)2012/1/23 WebLogic Server????:????????? FastSwap??????·???????(??) ??(WMV)??(MP4)- WebLogic Server????:???????????????????(??)??(WMV)??(MP4)- WebLogic Server????:????????? ?????????????????????·??????????????????????(CAT)(??) ??(WMV)??(MP4)- WebLogic Server????:????????? ???????????????????????:????????????????????(??) ??(WMV)??(MP4)- WebLogic Server????:????????? JRockit Mission Control(??)??(WMV)??(MP4)- WebLogic Server????:????????? JRockit Flight Recorder????WebLogic????????????(??)??(WMV)??(MP4)- WebLogic Server????:????????? ?????????????? ???????????(??)??(WMV)??(MP4)- WebLogic Server????/???????????????????????????????????WebLogic????????(WMV)??(MP4)2011/3/24 WebLogic Server????WebLogic Server?JDBC??????????(WMV)??(MP4)2010/6/17 WebLogic Server????Oracle WebLogic Server???????Web??????? -???-??(WMV)??(MP4)2010/2/17 WebLogic Server????????????????? WebLogic Server ?????????????? ??(WMV)??(MP4)2012/1/23 WebLogic Server????????????????!WebLogic Scripting Tool?????WLS???·??????(WMV)??(MP4)2012/1/23 WebLogic Server????????????????????????~Oracle WebLogic Server 11g~??(WMV)??(MP4)2010/2/10 WebLogic Server????????????????!EM???WebLogic?????(WMV)??(MP4)2010/5/27 WebLogic Server ?????????????????WebLogic Server???????????????(WMV)??(MP4)2010/3/24 WebLogic Server????Oracle???????????????????????·????!??(WMV)??(MP4)2011/5/26 WebLogic Server??·????????OracleAS???????WebLogic Server??????????(WMV)??(MP4)2010/4/22 WebLogic ServerExalogicOracle Exalogic Elastic Cloud ?? ~ Exalogic ??? ~??(WMV)??(MP4)2012/1/23 JRockit??JVM JRockit?? ??Update??(WMV)??(MP4)2011/03 CoherenceOracle Coherence ?????·????????????????(WMV)??(MP4)2012/1/23 CoherenceOracle Coherence ????????????????(WMV)??(MP4)2012/1/23 Coherence???????????!???!Oracle Coherence?????????????????????????(WMV)??(MP4)2012/1/23 Coherence????????????Coherence??????(WMV)??(MP4)2011/04 SOA/BPM/????? ???? ?? ????????? ??? ?? BPM???????????BPM?????????????? ??(WMV)??(MP4)2011/04 BPMBPM Suite 11g??????????????????(WMV)??(MP4)2011/03 CEP??????????????????????????CEP????????(WMV)??(MP4)2011/04 ????????? ???? ?? ????????? ??? ?? ?????????????????????!???·????????????(WMV)??(MP4)2010/5/25 ???????Notes??????????????(WMV)??(MP4)2010/5/20 ???????Notes??13?????????????????????!??(WMV)??(MP4)2010/4/20 ??????????????????????Notes?????????????(WMV)??(MP4)2010/3/17 ???????Mashup Award5 ????????????????????????????????·?????????(WMV)??(MP4)2010/2/23 ID??/?????? ???? ?? ????????? ??? ?? ID????????????????!!~OracleDB?????????????????????????(WMV)??(MP4)2012/1/23 ID?????????????!????ID????????????(WMV)??(MP4)2010/6/15 ID???????????!????DB?OS?????/???????????(WMV)??(MP4)2010/1/27 ??????????/???????????????·???????????(WMV)??(MP4)2011/04 ?????????????~???????????????????(WMV)??(MP4)2011/4/5 ??????????!??ID·??????????????????(WMV)??(MP4)2010/12/7 ???????????????·???????????(WMV)??(MP4)2010/6/23 ?????EPM/BI EPM/BI ??????? ???? ?? ????????? ??? ?? ???BI????????????BI?????~5W1H1T?~??(WMV)??(MP4)2010/3/17 ???BI????????????BI?????~?????????~??(WMV)??(MP4)2010/2/24 ???????BI?????????? -Evidence-based Management- ??????????(WMV)??(MP4)2010/2/18 ???BI????????????BI?????~???KPI?~??(WMV)??(MP4)2010/1/28 EPM/BI ???? ???? ?? ????????? ??? ?? ??BIEE?????????????????(WMV)??(MP4)2010/3/10 OS/??? ???? ?? ????????? ??? ?? ???Solaris??????Oracle Solaris??????(WMV)??(MP4)2010/10/14 ???SolarisSolaris 10 ?? ~????Solaris???~??(WMV)??(MP4)2010/9/14 ???ZFSZFS ???! ZFS ???????(???)??(WMV)??(MP4)2011/11/21 ???ZFSZFS ???! ??????????????????(WMV)??(MP4)2010/9/28 ???LinuxOracle Linux?Unbreakable Enterprise Kernel?????(WMV)??(MP4)2011/11/21 ???LinuxOracle Linux Unbreakable Enterprise Kernel?????????(WMV)??(MP4)2012/5/14 ???Linux??????Oracle?????????Linux????(WMV)??(MP4)2010/5/25 ????????????????????????????????????(WMV)??(MP4)2012/1/6 ???????SolarisSolaris: ??????????????? ??(WMV)??(MP4)2011/1/27 ???????SolarisOracle Solaris 11????????????????? ??(WMV)??(MP4)2012/5/14 ???????SolarisSolaris ? DTrace ?????????????(WMV)??(MP4)2010/9/21 ???SolarisOracle Solaris 11 ??????????????-IPS ??????? ??(WMV)??(MP4)2012/5/14 ???SolarisSolaris ?????????????????????????????? ??(WMV)??(MP4)2012/5/14 ???ZFSZFS?Oracle UCM????????????? ??(WMV)??(MP4)2011/12/19 ???? ???? ?? ????????? ??? ?? ???SPARCSPARC ????? ~ OVM ???????!??(WMV)??(MP4)2011/12/5 ????? ???? ?? ????????? ??? ?? ???SAN????????????? Pillar Axiom 600 ???? ??(WMV)??(MP4)2012/4/23 ???ZFSOracleDB????SunStorage7000?????(WMV)??(MP4)2010/9/9 ????????!??????????????????????(WMV)??(MP4)2012/2/6 ???ZFS??S7000???:S7000????????????(WMV)??(MP4)2011/12/5 MySQL ???? ?? ????????? ??? ?? MySQL????MySQL????MySQL?????? ????????(WMV)??(MP4)2011/7/25 MySQL???MySQL??MySQL?? ?????(WMV)??(MP4)2012/1/23 MySQL???MySQL??MySQL?? ?????(WMV)??(MP4)2012/5/28 MySQL???MySQL??MySQL?? ???????(WMV)??(MP4)2012/6/25 MySQL???MySQL??MySQL???????(WMV)??(MP4)2011/7/25 MySQL????????????????MySQL ???????????????(WMV)??(MP4)2012/1/23 MySQL???MySQL Cluster MySQL Cluster ??????(WMV)??(MP4)2012/2/6 MySQL???MySQL Cluster MySQL Cluster 7.2 ??????(WMV)??(MP4)2012/3/19 MySQL??????? MySQL ????????(WMV)??(MP4)2012/2/6

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• Oracle Launches New Oracle Database 12c Administrator Certifications

  - by Brandye Barrington

  Today Oracle University announces the release of new Oracle Database 12c Administrator certifications. The new Oracle Database 12c certifications emphasize the foundational and advanced skills needed by Database Administrators and will prepare DBAs to leverage powerful new management and consolidation capabilities, resulting in an even more valuable credential for customers and partners. ORACLE CERTIFIED ASSOCIATE (OCA)  The Oracle Certified Associate (OCA) for Oracle Database 12c objectives measure IT professionals' mastery of day-to-day administration skills and their ability to manage the challenges they're likely to encounter on the job. This credential focuses on SQL skills, operational administration of the Oracle Database including performance and space management, and installing, patching and upgrading the Oracle Database. Earning the OCA credential requires successful completion of two exams: 1Z0-061 - Oracle Database 12c: SQL Fundamentals and 1Z0-062 - Oracle Database 12c: Installation and Administration. The OCA certification track also allows for several alternate exams which can be substituted for 1Z0-061. ORACLE CERTIFIED PROFESSIONAL (OCP) Building on the competencies in the Oracle Database 12c OCA certification, the Oracle Certified Professional (OCP) for Oracle Database 12c certification includes advanced knowledge and skills required of top-performing database administrators. The OCP credential focuses on developing and implementing backup and recovery strategies, designing consolidation strategies to exploit multitenant container and pluggable databases, and thorough understanding how CDB/PDBs fit into the DBaaS cloud-computing model. Today, Oracle is releasing 1Z0-060 - Upgrade to Oracle Database 12c, which allows Oracle Certified Professionals with credentials in Oracle 9i, Oracle Database 10g or Oracle Database 11g to upgrade to Oracle Database 12c with a single exam. The upgrade exam focuses on designing consolidation strategies to exploit multitenant container and pluggable databases, implementing Oracle 12c feature-rich ILM support, optimizing SQL execution using dynamic swapping of sub plans, implementing real-time data redaction within databases, as well as exploiting many additional performance, backup and recovery, security and partitioning enhancements. The exam also includes a thorough review of core DBA skills. Visit the OCP certification track for more details on the new upgrade exam as well as alternate certification paths. ORACLE CERTIFIED MASTER (OCM) The Oracle Certified Master (OCM) for Oracle Database 12c - a very challenging and elite top-level certification - certifies the most highly skilled and experienced database experts. Further information on the 12c OCM level will be announced as exam development concludes. To date, there have been more than 1.6 million Oracle certifications granted worldwide. Explore these certification tracks, exam requirements and objectives, and start toward earning your exciting new Oracle Database 12c certification credentials from Oracle.

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• What advantages do we have when creating a separate mapping table for two relational tables

  - by Pankaj Upadhyay

  In various open source CMS, I have noticed that there is a separate table for mapping two relational tables. Like for categories and products, there is a separate product_category_mapping table. This table just has a primary key and two foreign keys from the categories and product tables. My question is what are the benefits of this database design rather than just linking the tables directly by defining a foreign key in either table? Is it just matter of convenience?

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