forced to deleted still apply the constraint

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• How to apply the constraint ONLY to new lines

  Hi, gurus:

  I have a question as follows:

  We need to migrate a legacy to a new production server system. I have to add two columns from each table to record that updates the row most recently through triggers, and I must ask constraint not null for columns. However, since the old system has already given for each table and old data have no value for 2 new columns. If we apply the constraint, all existing lines throws an exception. I wonder if there is possibility to apply the ONLY constraint to the new lines coming in the future.

  Thank you.

  Sam

  We need to migrate a legacy to a new production server system. I have to add two columns from each table to record that updates the row most recently through triggers, and I must ask constraint not null for columns.

  The best suggestion I can give you is that you ensure that the management of the documents on behalf of the person who came up with this requirement of brain hair so they can sufficiently punished for the huge waste of human and database resources they have caused for which they almost NOTHING got in return in the future.

  I've seen many systems over the past 25 years + who have added columns such as: CREATED_DATE, CREATED_BY, MODIFIED_DATE MODIFIED_BY.

  I have yet to see a system where this information is really useful for any real purpose. Many systems have the users/application schema, and users can change the data. In addition, a DBA can modify the data, and many of them can connect as long as the schema owner to do.

  Many tables also updated by other applications or processes of loading of bulk and these processes use generic connections that cannot be attached to any particular system.

  The net result is that these columns will be filled by user names that are completely useless for verification purposes.

  If a user is allowed to edit a table, they are allowed to modify a table. If you want to track that you need to implement a security strategy appropriate using the functionality of Oracle's AUDIT.

  Encumber ALL or even many of your tables with columns is a very BAD idea. Worse is the addition of doesn't trigger this server no other goal but captures the useless information, but because they are the impacts on performance just PL/SQL cause worse the total impact.

  Must certainly be to worry about security and auditability of your important data. But by adding columns and triggers, such as those proposed is NOT the right solution to achieve this security.

  Before your organization any decision so stupid you should propose that the same steps before adding this feature you should take before the addition of ANY structural MAJOR or the application:

  1. document the real need

  2 document and justify the business reasons for this need

  3. perform tests that shows the impact of this requirement on the production system

  4. determine the cost of the resources (people, storage, etc.) to implement this requirement

  5 demonstrate how this information will actually be used EFFECTIVELY for professional purposes

  With regard to points #1 and #2 above that the requirement should be noted with regard to the PROBLEM to be solved, not a some preconceived notion of the solution that should be used.

  Your org should also speak to other associations or other departments in your org even who have used your proposed solution and discover how useful it was for them. If you do this research, you may find it has not responded to their needs at all.

  And in your own org, there are probably some applications with tables that already have such columns. Has anyone here EVER used these columns and found them invaluable to identify and solve any real problems?

  If you can't use them and why first add their data to some important process?

  IMHO, this is a total waste of time and resources to add columns in your tables. Any such audit or security, at least, approach will be limited to those tables with key data that needs to be protected, and then only when you cannot implement the appropriate audit "best practices".

  A migration is hard enough without adding unnecessary additional expenses such as those. You have MUCH more important you can do with the resources that you have:

  1. capture all THE DDL for the existing system in a version control system

  2. train your developers on the use of the version control system

  3. determine the correct configuration of the new server and the system. It's almost a CERTAINTY that parameters will change and performance will suffer even if you don't think you have changed anything at all.

  4. validate that the data was migrated correctly. Which may involve a broad polling and comparison to make sure that the data has not been altered during migration. The validation process to a SINGLE TABLE is more difficult if the table structures are not the same. And they will not if you add two columns in each table; every single request, you do have to specify the columns by name in order to EXCLUDE from your two new columns.

  5. validate the performance of the app on the new system. He there will HAVE problems where things do not work as they did. You need to find these problems and fix them

  6 capture appropriate statistics after that data has been migrated and all indexes have been rebuilt.

  7 enter the new implementation plans to use a base for when things go wrong in the future.

  If it's worth doing is worth doing right.

• ON DELETE CASCADE and the CASCADE CONSTRAINTS - what are the difference?

  I know that CASCADE CONSTRAINTS would allow me to remove the parent key and the reference of the following children will be freed from the constraints. However, the child columns will remain and will be set to NULL.
  
  SO:
  
  If the CASCADE CONSTRAINTS could do the job, why do we need on REMOVE CONSTRAINTS?
  
  Unnecessary extra Note:
  
  I know that YOU DELETE CONSTRAINT is defined with the child. When I tried to delete the parent key without having the CONSTRAINTS of the WATERFALL, I got an error message indicates that the parent key has childs! So ON DELETE CASCADE was not up to what I had to mention the CASCADE CONSTRAINTS when deleting the parent key while the CASCADE CONSTRAINTS worked fine without ON DELETE CASCADE on the side of the child.
  
  I hope that my question is simple...

  A foreign key with a delete cascade means that if a record in the parent table is deleted, then the corresponding records in the child table with automatically deleted. This is a deletion of the waterfall.

  Forced to cascade deletes all foreign keys that reference the table to remove, and then deletes the table.

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  Hi agent CU v-13lawl,.

  1. What is drive E on the computer?
  2. Did you the latest changes on the computer?
  3. You have security software installed on the computer?

  Method 1

  I suggest you run the disk cleanup on your computer and check if it helps.

  Description of the tool in Windows XP disk cleanup

  http://support.Microsoft.com/kb/310312

  Method 2

  I suggest to use Disk Defragmenter and check if it helps.

  How to analyze and defragment a Windows XP disk

  http://support.Microsoft.com/kb/305781

  Method 3

  I suggest that you scan the computer for virus or malware infections and check if it helps.

  http://www.Microsoft.com/security/scanner/en-us/default.aspx 

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  (1) have you made changes before the start of this issue?

  (2) what happens when you try to start in safe mode?

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  I suggest you to place the computer in a clean boot state and check if the problem is resolved:

  1. sign the computer by using an account with administrator rights.

  2. click on Start, type msconfig.exe in the Start Search box and press ENTER to start The System Configuration utility. If you are prompted for an administrator password or for confirmation, type your password, or click continue.

  3. on the general tab, click Selective startup, and then click on to clear the load startup items check box. (The check box use the file Boot is not available.)

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  http://support.Microsoft.com/kb/929135

  Reset the computer to start as usual after you have finished troubleshooting, follow these steps to reset the computer to start as usual:

  Click Start , type msconfig.exe in the Start Search box and press ENTER.

  1. If you are prompted for an administrator password or for confirmation, type your password or click on continue.

  2. on the general tab, click the Normal startup option, and then click OK.

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  1. click on Start, click principally made programs, Accessories, right-click on command promptand select Run as Administrator.

  2. click on continue or provide administrator credentials if prompted.

  3. in the command prompt window , type the following, and then press ENTER:

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  4. you should see messages on the screen the following:

  From the analysis of the system. This process will take time.

  Start of the phase of verification of the scanning system.

  % Of verification complete.

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  Hello
   
   
  Thanks for posting your question in the Microsoft Community.
   
   
  The question you posted would be better suited in the TechNet Forums.
   
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  Screenshots attached to e-mail responses will not come back on the forum. You must connect to the forum and post in your topic using the camera icon in the editor.

  Google Chrome is a problem:

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  See you soon

  John
  http://John-Goodwin.blogspot.com/