The document discusses transient variables in Apex. It states that declaring variables as transient reduces view state size. Transient variables cannot be saved as part of the view state and shouldn't be transmitted when a Visualforce page is rendered. It also lists some objects that are automatically transient like HttpRequest. The document then asks questions about callouts, scheduling batches, future annotations limitations, and differences between enterprise and partner WSDLs.

1. * What is transient?
Use the transient keyword to declare instance variables that can’t be saved, and
shouldn’t be transmitted as part of the view state for a Visualforce page. For
example:
Transient Integer currentTotal;
You can also use the transient keyword in Apex classes that are serializable,
namely in controllers, controller extensions, or classes that implement the
Batchable or Schedulable interface. In addition, you can use transient in
classes that define the types of fields declared in the serializable classes.
Declaring variables as transient reduces view state size. A common use case for
the transient keyword is a field on a Visualforce page that is needed only for
the duration of a page request, but should not be part of the page’s view state
and would use too many system resources to be recomputed many times during a
request.
Some Apex objects are automatically considered transient, that is, their value
does not get saved as part of the page’s view state. These objects include the
following:
* What is call out and what is call in?
A) Making requests to external system from salesforce is callout.
Getting requests from external system is call in.
example of setting a custom timeout for HTTP callouts:
HttpRequest req = new HttpRequest();
req.setTimeout(2000); // timeout in milliseconds
* How many ways we can schedule Batches?Is it possible to schedule with external
tool like data loader?
A) We can schedule batches using dataloader.
We can use Schedulable interface to schedule batches
Yes, We can schedule the data loader using CommandLine Interface.
* Is there any limitations to use @future?
A) @future: future annotation to identify methods that are executed
asynchronously.
Yes,the following are @future limitations.
1. No more than 10 method calls per Apex invocation
2. No more than 200 method calls per Salesforce license per 24 hours
3. The parameters specified must be primitive dataypes, arrays of primitive
datatypes, or collections of primitive datatypes.
4. Methods with the future annotation cannot take sObjects or objects as
arguments.
5. Methods with the future annotation cannot be used in Visualforce controllers
in either getMethodName or setMethodName methods, nor in the constructor.
* After executing workflow rules agin before triggers and after triggers will
execute, How can you avoid?
* Are you using any external tools like bug traker in your company?
* What is the difference between enterprise WSDL and partner WSDL?
A)
Enterprise WSDL
* Is strongly typed, the object and its attributes are fixed.
* Contains the metadata about all standard and custom fields and objects.

2. * Can only be used against your Salesforce instance.
Partner WSDL
* Is loosely typed, the object and its attributes can be variable.
* Takes an array of key-value pairs.
* Does not contain metadata about objects and fields.
* Can be used against many Salesforce.com organizations.
* What are the types of WSDL’s?
A) 1.Enterprise WSDL
2.Partner WSDL
3.Apex WSDL
4.Metadata WSDL
* for an email format data entering how can you write validation rules?
A) By using regex function
* What is SFDC life cycle ( After getting the requirements what will be the
steps)?
A) Analysis, Design, Develop the code in the sandboxes, writing unit tests, and
moving to test sandboxes to test
and then deploy to production with adequate code coverage.
* How can you avoid governer limits?
A) Using batches we can avoid governor limits.
* Have you used any annotations?
A) Yes.
* What is group by? When will you use?What is having? When will you use?beside
Groupby is it possible to use having?
A) While using aggregate functions we should use group by.
Group by is used in soql queries to fetch the records by grouping based on
specific fields
Yes we can use having.
* What is the diffrence between List, set, map?
A) List:
List is a Unordered collection of values. It contains duplicate values. Each
value is retrieved using the List Index.
Set:
Set is an ordered collection of values. It does not contains duplicate values.
Map:
Map is a key value pair datatype.duplcate value but not duplicate key.
* What is the difference between workflow and Triggers?
A) workflow Trigger
1. workflow is inbuilt functionality 1.Trigger is used for complex business
process
used on single object. in which multiple objects can handle.
2. workflows fire when DML events like 2. Trigger is also same when DML events
occur like

3. insert, update occur.workflows cannot fire insert, update, delete.in deletion
trigger will fire.
when delete event occur.
3. workflows will only help to update the same object 3. Trigger can work across
objects and where in
or master object in custom master detail relationship. you can query the object
as well as you can do DMLs.
* How can you display error messages on visualforce page?
A) <apex:pagemessages/>
* Call by reference and call by value in APEX?
A) Object references are call by reference and primitive types are call by
value.
* I need to put five radio buttons how can you do that?
A) Using <apex:selectRadio> tag.
* How can you show error messages on VF pages?
A) ApexPages.addMessage()
* Deployment Steps
A)
. Create a Developer Sandbox
• Authorize a Deployment Connection
• Create and Upload an Outbound Change Set
• Validate an Inbound Change Set
• Deploy an Inbound Change Set