Better to use an arbitrary primary key?

Hi all

I have an employee table where each employee has a unique employee ID. I expect to look up employees by their ID frequently. Is it better to use an arbitrary sequence as the primary key and put an index on the field ID employee or to the employee ID primary key? Thanks for your help.

Welcome to the forum!
>
Is it better to use an arbitrary sequence as the primary key and put an index on the field ID employee or to the employee ID primary key?
>
Best practice is to use surrogate keys (for example, your arbitrary sequence) rather than actual data (employee ID) for the key field values.

The main reason is that the values of data, data, maybe should be changed in the future. If you use a piece of data as the primary key and then must change any changes becomes problematic if there are references to foreign keys to it.

Another reason is that these references to foreign keys mean that the value of data is now duplicated and exist in several tables. It should be changed in any of these tables.

And business rules to deal with employee ID (or any other value of data) may change. It may be encrypted or protected against access by unauthorized persons. If ID is a primary key, because it is much more difficult to encrypt or protect the value is necessary to join the tables correctly and will therefore always available for the purpose of the request, even by people who are not allowed to access the value actually.

Never use values of actual data for values of key with the exception of the simple sample applications.

Tags: Database

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    at com.sun.el.MethodExpressionImpl.invoke (unknown Source)

    at oracle.adf.controller.internal.util.ELInterfaceImpl.invokeMethod(ELInterfaceImpl.java:173)

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    at oracle.adfinternal.controller.application.NavigationHandlerImpl.handleAdfcNavigation(NavigationHandlerImpl.java:115)

    at oracle.adfinternal.controller.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:84)

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    at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.broadcastEvents(LifecycleImpl.java:1137)

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    to weblogic.servlet.internal.StubSecurityHelper$ ServletServiceAction.run (StubSecurityHelper.java:227)

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    at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)

    at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)

    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

    to oracle.security.jps.ee.http.JpsAbsFilter$ 1.run(JpsAbsFilter.java:119)

    at java.security.AccessController.doPrivileged (Native Method)

    at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)

    at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442)

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    at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)

    at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)

    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

    at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139)

    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)

    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)

    to weblogic.servlet.internal.WebAppServletContext$ ServletInvocationAction.wrapRun (WebAppServletContext.java:3715)

    to weblogic.servlet.internal.WebAppServletContext$ ServletInvocationAction.run (WebAppServletContext.java:3681)

    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)

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    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)

    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)

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    Hi all, finally I found the solution to this exception.

    I did the following steps to solve the problem.

    1. create a bean and use this method

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    Add the code in the event here...

    System.out.println ("inside the Handeler");

    FacesMessage message =

    new FacesMessage ("Type your friendly message");

    message.setSeverity (FacesMessage.SEVERITY_ERROR);

    FacesContext fc = FacesContext.getCurrentInstance ();

    fc.addMessage (null, message);

    }

    Now, drag and drop the file above java projects in data controls in the browser of the application.

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  • Order columns (which make up the primary key constraint) matter in where clause of DML query for use of indexing mechanism to operate.

    Version of DB: database Oracle 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production


    I have a table my_table as below:
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    (
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    Primary_key here's a composite key that contains columns 1 (my_code) and 2 (my_id).
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    (a) select * from my_table where my_code = '123' and my_id = "456";
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    The understanding I have the order of the column in the where clause should be identical to the sequence in
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    so I don't know if I'm wrong in the concept that I have. Kindly help.

    Thanks in advance,
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    Your question is answered in the Performance Tuning Guide

    Using indexes and clusters

    14.1.4 choosing composite indexes

    A composite index contains several key columns. Composite indexes can provide additional benefits compared to the index to single column:

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      Sometimes the two or more columns or expressions, each with a low selectivity can be combined to form a composite with a high selectivity.

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      If all columns selected by a query are a composite index, then Oracle may return these values in the index without access to the table.

    A SQL statement can use a path on a composite index if the statement contains constructions that use a main part of the index.

    Note:

    This is no longer the case with the skip index scans. See "Index Skip Scans".

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  • How to extract the values of the line full in the bean to support using the primary key

    Hello

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    Right now, I can go get plant in backing bean name, but I can't understand how business plan for extraction and identification of email of the engineer resident in this key primary-plant_name at the bean to support.

    Please let me know if anyone has an idea in this regard.

    JDeveloper version 11.1.1.6.0

    Thanks in advance.

    Sneha

    Sneha211 wrote:

    On the jsff page

    required = "#{bindings." Plant.hints.Mandatory}.

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    autoSubmit = 'true '.

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    String aamplant1 = (String) newRow.getAttribute ("Plant");

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    OR if your condition is like that-

    you have a primary key field value, but you do not have the corresponding line, then you can get that line and it's attribute by using the primary key value

    See - http://adfgouravtkiet.blogspot.in/2012/10/filtering-of-data-from-vo.html

    Hope it helps

    -Ashish

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    I have a clue about 2 fields so that I can make my form based on these 2 fields
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    Is this the right approach
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    Your primary key must never rest on 'natural touches', that is to say the actual data in your table. The fact that you are talking about a composite key means that you think that do. You can create an index that is UNIQUE on these types of fields to maintain the integrity of the data, but they do not have the pharmacokinetics of the table.

    My primary keys are always a NUMERIC field, populated by a combination of sequence/relaxation. Because the data in the ID field have no connection with the data in the table - there is never any need/reason to change. As has been mentioned above, ROWID changes rarely, but it is possible for them. I use ROWID in the Apex and when I have forms to keep tiny (maybe 5-10 lines) lookup tables that are used to populate LOVs create a primary key is excessive.

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