Oracle Database

A constraint between two sets of attributes is known as functional dependency in relational database. Determination of functional dependencies is vital in database denormalization, normalization and relational model.

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From Database Systems: Design, Implementation, and Management 10th Ed - Coronel / Morris / Rob - 1.3.1 Role and Advantages of the DBMS:

The DBMS serves as the intermediary between the user and the database. The database structure itself is stored as a collection of files, and the only way to access the data in those files is through the DBMS. Figure 1.2 emphasizes the point that the DBMS presents the end user (or application program) with a single, integrated view of the data in the database. The DBMS receives all application requests and translates them into the complex operations required to fulfill those requests. The DBMS hides much of the database's internal complexity from the application programs and users. The application program might be written by a programmer using a programming language such as Visual Basic.NET, Java, or C#, or it might be created through a DBMS utility program.

you can try but you need some serious computer code skills

Super Smash Bros.

service selection board.

The head office of Oracle Sun Microsystems is located in Hillsboro Oregon in America. An exact address is not given and people that want to get in touch must email, fax or phone

The main differencre between subquery and co-related subquery is that in subquery child query is executed first n then parent,but in co-related subquery main query is executed first(even though parenthesis are present) and then child query. Example of co-related subquery select dname from dept where exists

(select deptno from emp

where dept.deptno=emp.deptno); select dname from dept where not exists

(select deptno from emp

where dept.deptno=emp.deptno);

Linux

to tell the future

Arraylist Java runs on Oracle which is a relational data management database produced by the Oracle Corporation. Arraylist Java has been part of the Java framework ever since Java 5.

Anomalies are not required in a database. An anomaly is a inconsistency or a problem. A well designed database should not have any anomalies. If there are some, they can cause problems for the users and for the reliability and efficiency of the database.

3NF is where data depends on nothing but the whole key. It seems that every 3NF table should be in BCNF, as BCNF is stricter than 3NF. But, BCNF requires that every nontrivial attribute is a superkey, even if the dependent attributes are part of keys, that is, when X->Y, X is a superkey for the relation, where 3NF also allows that Y is a key attribute for the relation.

In SOA10g suite Oracle fell somewhere in the middle of these two, they attempted to get the best of breed products together and also tried to make integration between each product smooth and flowing. Keeping in mind this was one of the first iterations of the SOA suite I think they did a great job. However I was always left with a feeling that I felt that there was no clear cut line between what each product does, as well as integration between each product could have been more seamless.

Then came SOA11g Fusion this product is hands down one of the most comprehensive SOA suite products on the market. Oracle's Acquisition of BEA was one of the best they could have made. The product is well integrated as well as each product within the stack has its very own purpose. Not only do the products integrate well, but they perform exceptionally well.

Database versions are incremented based on the number of changes in the new release. For instance. Oracle 5 to Oracle 6. There is a significant amount of differrences/updates between those two versions. However, Oracle 8.0 to 8i--there are only minor updates because they are both within "8". If I remember correctly, the main difference between these two was that 8i incorporated "internet" options. (hence where the I came from) i=internet.

A natural join allows the database to attempt to determine relationships on behalf of the programmer by comparing column names and joining on those fields. It only shows columns once when they are duplicated in the tables, and operates on rows that contain matches in both tables (an "inner join").

A outer join will show results for any matching rows, even if one of the two tables does not contain a matching record. In those events, the empty table's fields will be "null", since no match was found. Depending on the type of outer join, either table a will always have a record, table b will always have a record, or either table may not have a record (but at least one record is required per row to generate a row).

multidimensional database

You create your own data structure in database.

Data dictionary it contains the names and description of the dictionary tables and views.

Oracle Grid Control allows IT specialists and programmers to monitor all applications and network activity, ensuring optimization of internal and external processes.

Dirty data is incorrect or incomplete input and can originate in many ways. However, we should also consider the method through which data is determined to be, in fact, dirty. For example, a record may have the incorrect address for a customer but that isn't to say that when the record was created the address was incorrect, it may have changed. Timing and maintenance also play a role.

Generally speaking, data is moved through a three step process known as E.T.L. (Extract, Transform & Load). Extraction is the process of sourcing the data; data entry or from a device or location. Transformation is the process used to validate and coerce the data into predetermined formats. Loading is the process by which the formated data is moved to it's destination.

Most dirty data originates from processes involving data entry and is a result of human err, poorly defined or understood process requirements and/or inadequate validation/error handling methods.

The first step is to completely and accurately define requirements. What data is being collected, where does it come from and how often (Extraction)? How will the data be validated and errors reported (Transformation)? How will it be stored (Loading)?

Only after these questions have been answered can the E.T.L. process can be designed. Once designed, the process requirements are disseminated to the extraction source.

Within user based extraction processes there are many common methods to reduce dirty data. Some of these are; spell checks, data type validations, required fields and value limited input controls such as check, combo and list boxes. When designing the extraction method (or front end for user based systems) the general rule of thumb is the less data entry the better. Other common methods include tool tips (floating help boxes), top to bottom, left to right, tab ordered fields (for heads down data entry) and visual/audible cues for data validation exceptions.

RAID is the use of multiple disks and data distribution techniques to

get better Resilience and/or Performance

RAID stands for: Redundant Array of Inexpensive / Independent Disks

Oracle 11g R2

one of the difference is HQL does not support distinct but SQL supports the distinct in the query

Oracle Hyperion was created in 1981.

Engine Computer Control System

*- Also regarding Nissan 720 p/u Z24, ECCS can stand for Electronic Concentrated Control System ( I know 85's have this & 84 Calif. mod not sure what other years). System function is to control the fuel/air mixture at carb, it consists of following subsystems and components: spark plug switching control (switchs from 4-8 active plugs when needed), fuel shut off control (shuts off fuel during deceleration), fuel mixture heater (fitted under carb to heat fuel for better vaporization/burn), air fuel ratio control solenoid ( located in carb is the actual air/fuel mixer, different voltage inputs cause it to stay within certain values 14.7to1 I think!), O2 sensor, H2O temp sensor, throttle valve switch (located on side of carb sends throttle points to computer), vacuum switch on Int. manifold, clutch switch, neutral switch, inhibitor switch(A/T). On Z20 engines the ECCS incorporates a detonation sensor subsystem ( senses engine knock/ compensates). I've been unable to find a wiring diagram for insides of this control system nor any testing instructions, unit has one green light on side facing engine, I've yet to attempt checking it for any diag. codes (most of these units have a red and green light, however this year/model has only one green, will check it for slow/fast blink codes and update as needed. Sorry got carried away, toomuch info perhaps, but I like to be thorough.