Don’t depend on the internet all the time.

<!-- [if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning/> <w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing> <w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery> <w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:SpaceForUL/> <w:BalanceSingleByteDoubleByteWidth/> <w:DoNotLeaveBackslashAlone/> <w:ULTrailSpace/> <w:DoNotExpandShiftReturn/> <w:AdjustLineHeightInTable/> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:UseFELayout/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!-- [if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!-- [if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]-->

The life is full of disagree about the certain subjects.

The Oracle is not a exception on this point.

People will disagree and there can sometimes be conflicting opinions eg.
-Do you need RAC, DataGuard,Streams?
-What is the best approach for performance tuning,for copy data to remote destination?

It helps you make a more informed judgment if you are exposed to both sides of the debate on these occasions.
But it is not as easy as you think because many experts always give you different viewpoint.

You need make your own judgment before taking any action.

In order to make sure that the advice you are following is appropriate to your circumstances.

You can view the internet as you friend but this friend can not guarantee the quality of its telling.

Maybe the advice is out of date or irrelevant to your particular configuration.

If the advice include the scripts or command, do not run them on your production.

Read through the script and make sure you understand what it is.

Look up the command if you are not sure what it will do on your database.

So in most occasions the internet can not help a person without any basic senses on the database.
We need the common sense and good habit for a good DBA.

Improve yourself if first important thing you need to do.

Accumulate your own experience widen your own knowledge area and test things our for yourself.

Do not believe any one you should be dare to doubt the expert.

The database is your boss. Test everything out on your database especially you run into conflicting advice.

There is no prescription that can link up different minds except the genuine friends.

The database is a prescription that can link up the different minds.

The test is only one way to solve the disputes on certain issue.

It is the only way you can be sure what is correct in your circumstances.