Salesforce best 100 interview questions from admin, apex, visualforce, batch to integration


1.    Difference between profiles and roles.
a.    Profile It is a group/collection of settings and permissions that define what users can do in Salesforce. For example, the designation of an employee in a company. Same profile can be assign to many users. There are two types of profile Standard and Custom.
b.    Role It controls the level of visibility that users have to an organization data. Example Sr. Manager, Junior Manager Etc.
In simple term profile dedicate what you can do at object level where as role determine what you can do with individual record

2.    What is Record Type?
a.    It let you offer different business process, picklist values, layouts to different user. For Example for multivendor site if there are different categories like groceries, food etc then they will have different layout which we can do with this Record Type.

3.    What is Salesforce architecture?
a.    MVC and multitenant. Multitenant means all users having same database with same privilege.

4.    Difference between External ID and Unique ID
a.    External ID It usually refers ID from external system. If customer has an Oracle Financial System that they will be linking with Salesforce it will easier for them to refer Oracle ID.
b.    Unique ID It prevents you from entering same value again.

6.    How you can manage Record-Level access
a.    Access Level in Record Level Security
i.    Public Read/Write User can view and edit all record
ii.    Public Read Only - User can view all record but only certain user edit the record (to whom the access is given
iii.    Private No user can view or edit that particular object
b.    It can be manage in four ways
i.    Organization-wide defaults determine the baseline level of access for all records of an object. It should be most restrictive in record level security because other record level security implementation only grant additional access, they cannot restrict the access. It is done through Sharing Settings in setup
1.    Suppose if you want to restrict only 1 user among 100 and 99 will have Read/Write access then also you need to Private the OWD and give additional access by Role Hierarchy or Sharing rule to other 99 user.
ii.    Role hierarchies give access for users higher in the hierarchy to all records owned by users below them in the hierarchy. Role hierarchies don’t have to match your organization chart exactly. Instead, each role in the hierarchy should represent a level of data access that a user or group of users needs.
iii.    Sharing rules are automatic exceptions to organization-wide defaults for particular groups of users, so they can get to records they don’t own or can’t normally see. Sharing rules, like role hierarchies, are only used to give additional users access to records. We should only create Sharing Rules for the object whose OWD is set to Public Read only or Private because if it is Public Read/Write then it will have all the access. They can’t be stricter than your organization-wide default settings. It is of two type
1.    Owner Based Sharing Rule
2.    Criteria Based Sharing Rule
Note : We can't define sharing rules for child object. Sharing rules for child object are inherited from parent object in master-detail relationship
iv.    Manual sharing allows owners of particular records to share them with other users. Although manual sharing isn’t automated like org-wide sharing settings, role hierarchies, or sharing rules, it can be useful in some situations, such as when a recruiter going on vacation needs to temporarily assign ownership of a job application to someone else. We can share the record by Sharing button but only when Sharing Rule on that object is Read Only or Private.


7.    How to restrict user for certain login access (like Login Time, IP Address etc)
a.    You need to go to Profiles then select the Profile in which you want to give restriction. Select IP Ranges & Login Hours to give restriction to people

8.    What is difference between Modify All & Edit and Read & View All
     a.  View All & Modify All are not available for Ideas, Pricebooks, Article Types and Products

9.    What is Organization Level Security in Salesforce?
a.    Setting Password Policy
i.    To stop hacker and unauthorised person this policy define complexicity for password like capital letter, in how many days password expire, invalid login attempt and logout period(like 15 min, 30 min , 60 min, forever)
b.    Restricting by IP address
i.    We can set the range of IP address so that only person within organization within IP range can only login (but make sure IP address is static otherwise admin will also face problem in login)
c.    Restricting the user by Time
i.    Suppose you want to access org only from 9AM to 5PM and from Monday to Friday
d.    Restricting by Email Domain
i.    Suppose the company want to login form particular company domain only and not login with other domain.
Note : we can do these all by Health Check tool also

11.  What is Object level security?
In this level of security we prevent user or group of user from creating, viewing, editing or deleting of records of an object by setting Permission on that object and setting Profile
For example User A and User B are there and there is object ABC is there we want User A can only view the Object ABC and User B can modify, read, delete Object ABC, we can do this by Permission set and Profile. We will first Profile with same Read functionality and which will have read only access and now we will create Permission set and on Object setting we will give access to Modify, Read, Delete and will assign this to User B

12.  What is Field Level Security?
a.    It controls whether a user can see and edit the values for a particular field on an object. It can be implemented on two level
i.    Profiles
ii.    Permission Sets

13.  Why Field Level Security is required if we want to do that Field cannot be sheen to particular user it can be done through Record Types?
a.    Record Types does not allow the user to see those fields and it is restricted to Detail and Edit page only but if user see in List View, Search result, Related List, Visual Force page, Reports it will be visible so we need Field Level security

14.  What is Email-To-Case & Web-To-Case?
a.    Email-To-Case - It let your customers send inquiries to email addresses that automatically convert customer emails to cases.
b.    Web-To-Case - Gather customer support requests directly from your company’s website and automatically generate new cases with Web-to-Case.

15.  What is Web-To-Lead?
a.    Using pre-existing pages on your company's website, you can capture contact and profile information from users and automatically generate new leads in salesforce.com, enabling you to respond in real-time to customer requests. Like Contact Us form in your website

16.  What if user have Object Level Security Read and Record Level Security Read/Write and also explain vice versa condition

a.    If user have Object Level Security Read and Record Level Security Read/Write then it will have only Read access and If Object Level Security has Edit Access and Record Level Security has Read access then user can only read. Here both combination security works on records. Whichever have most restrictive security Wins

17.  What will happen to junction object (Object C) if One object (Object A) OWD is Public Read/Write and Other object (Object B) OWD is Private ?
a.    It will inherit all the access of Primary Object (Say Object A) and ignore the access (Object B)

18.  When to use Workflow and Process Builder
a.    Reason why we choose workflow instead of Process Builder
i.    When to send Outbond Message
b.    Reason why we choose Process Builder
i.    Allow to control in order the different action and criteria. We can control the evaluation criteria. Workflow cannot evaluate the order of execution

19.  Understanding Leads, Accounts, Contact, Opportunities, Products, Pricebooks objects in Sales Cloud
a.    Campaign It use to store the information of the campaign which we do marketing, brand building any marketing stuff
b.    Lead It store the information of potential customer (Like if we sell camera then our potential customer who is interested in Camera or he is photographer)
c.     Account It store the information of customer(individual or company) to whom we are working or to whom we sell. (Like we sell camera to some Digital Company then its info will get save in Accounts)
d.    Contacts It store the information of individual working in that particular Accounts (Like there are some key people of some company who is in deal with us. Their info will get save in Contacts)
e.    Opportunity It store the information of Deal that happening or happened. (Like if we are selling 5 Cannon camera to some Digital Company and already sold 10 Nikon to other, all these info will get save into Opportunity)
f.      Products It store the information of product or services we are selling. (Like the information of Camera its model and Lens whatever stuff will get store in Products)
g.    Pricebook It store the information of different prices of same products (Like same camera is selling to company at other price and to other company at different)
h.    Quote It store the information of quotation about products or services. We can have different quotes for single deal.
i.      Contract It store the information of contract that we have deal with customer or company

20.  Type Of Sandbox
a.    Developer Sandbox (1 day, 200MB)
b.    Developer Pro Sandbox (1 day, 1GB)
c.     Partial Copy Sandbox (5 days, 5GB)
d.    Full Sandbox (29 days, Same as prod org)

21.  Difference between Account & Contacts
a.    Contacts are individual within a company and account with which you do business. In order to create contact you need to have an account

22.  Can a checkbox act as controlling field?
a.    It can be possible to make Checkbox as controlling field but not dependent field

25.  What is sales cloud and service cloud?
a.    "Sales Cloud" refers to the "sales" module in salesforce.com. It includes Leads, Accounts, Contacts, Contracts, Opportunities, Products, Pricebooks, Quotes, and Campaigns (limits apply). It includes features such as Web-to-lead to support online lead capture, with auto-response rules. It is designed to be a start-to-end setup for the entire sales process; you use this to help generate revenue.
b.    "Service Cloud" refers to the "service" (as in "customer service") module in salesforce.com. It includes Accounts, Contacts, Cases, and Solutions. It also encompasses features such as the Public Knowledge Base, Web-to-case, Call Center, and the Self-Service Portal, as well as customer service automation (e.g. escalation rules, assignment rules). It is designed to allow you to support past, current, and future clients' requests for assistance with a product, service, billing, etcetra; you use this to help make people happy.

26.  Explain Governor Limit and why it is introduced in Salesforce?
a.    It is the runtime limit enforced by the Apex runtime engine to ensure the code does not misbehave. As Salesforce is multitenant environment so there is no bias with users it is introduced in Salesforce.

i.
Item
Limit

ii.
-----------


iii.
Custom Fields
500

iv.
Rollup Summary Fields
25

v.
Custom Relationship Fields
40

vi.
Active Workflow Rules
50

vii.
Total Workflow Rules
500

viii.
Approval Processes
500

ix.
Active Lookup Filters
5

x.
Active Validation Rules
100

xi.
VLOOKUP Functions
10

xii.
Sharing Rules (Both Owner- and Criteria-based) 300

xiii.
Sharing Rules (Criteria-based Only)
50





Description

Synchronous
Asynchronous


Limit
Limit
Total number of SOQL queries issued1
100
200
Total number of records retrieved by SOQL queries
50,000

Total number of records retrieved
10,000

by Database.getQueryLocator


Total number of SOSL queries issued
20

Total number of records retrieved by a single SOSL
2,000

query



Total number of DML statements issued2
150

Total number of records processed as a result of
10,000

DML statements, Approval.process,


or database.emptyRecycleBin


Total stack depth for any Apex invocation that
16

recursively fires triggers due to insert, update,


or delete statements3


Total number of callouts (HTTP requests or Web
100

services calls) in a transaction


Maximum cumulative timeout for all callouts (HTTP
120 seconds

requests or Web services calls) in a transaction


Maximum number of methods with
50

the future annotation allowed per Apex invocation


Maximum number of Apex jobs added to the queue
50

with System.enqueueJob


Total number of sendEmail methods allowed
10

Total heap size4
6 MB
12 MB
Maximum CPU time on the Salesforce servers5
10,000
60,000

milliseconds
milliseconds
Maximum execution time for each Apex transaction
10 minutes

Maximum number of push notification method calls
10

allowed per Apex transaction


Maximum number of push notifications that can be
2,000

sent in each push notification method call



27.  Difference between Lookup and Masterdetail
a.    Lookup – Creates a relationship that links two object. When a parent object is deleted you can configure a child object to either clear the parent record value in the child or prevent deletion of the parent record.
b.    MasterDetail – Create a special type of parent-child relationship between objects (either between two custom object or custom and standard object but parent will be Standard object in this case). When a parent record is deleted all child records get deleted.

28.  What is Rollup Summary ?
a.    A read only fields that display the SUM, Minium or Maximu value. This is created on Master Detailed Field. Work only on data type like Number, Currency type field

29.  Explain Various Email Templates
a.    Text
b.    HTML with letterhead
c.     Custom HTML
d.    VisualForce

30.  What is bucket Field in report?
a.    A bucket field is group of related records which is defined by user as per requirement

31.  What is Skinny table?
a.    It is used to store frequently used fields. Limitation are
i.    Can have max 100 column
ii.    Fails to contain field from other table

32.  How many types of reports are there?
a.    Four Types
i.    Tabular
ii.    Summary
iii.    Matrix
iv.    Joined

33.  What is Custom Setting?
a.    It is almost similar to custom objects. Application developer can create custom sets of data and associate custom data for an organization, profile, or specific user. It get saved in Salesforce org only. There are two types List & Hierarchy

34.  What is Junction object?
a.    It is a custom object with two master detail relationship. It is a key to make Many to Many relationship between the objects

35.  What is Coarse-Grained & Fine-Grained components?
a.    Coarse Grained – Few objects holds lots of data like <apex:detail>
b.    Fine Grained – More object holds less data like <apex:inputField>

36.  What is Validation rule Name Few ?
a.    These rules helps us to improve data quality by preventing users from entering incorrect data.
i.    REGEX – compare text Field to regular expression
ii.    ISPICKVAL – Determines if the value of a picklist field is equal to a text literal you specify
iii.    CONTAINS – compare two arguments of text.
iv.    ISCHANGED – Compares the value of a field to the previous value
v.    ISCLONE – Check if the record is a clone of another record
vi.    ISNEW – check if the formula is during the creation of a new record
vii.    INCLUDES – Determines of any value selected in a multiselct picklist field equals a text literal you specify

37.  Difference between ISNULL and ISBLANK
a.    ISNULL only supports number field where is ISBLANK support both number and text

38.  Explain Process Builder ? (8 action)
a.    It is a point-and-click tool that let’s you easily automate business process and also can see the graphical representation of the process we build. We can also update the child records in process builder. Several actions can trigger the process builder
i.    Create a record
ii.    Email Alerts
iii.    Trigger apex code
iv.    Post to chatter
v.    Update records
vi.    Call another process
vii.    Launch a flow
viii.    Submit automatic for the approval

39.  Explain Work Flow?
a.    We can automate business process based on criteria like
i.    Send an Email
ii.    Create a Task
iii.    Filed Updates
iv.    Outbond Message
b.    It only work in masterdetail. In this we can update only parent record.
c.     Type Of Action
i.    Immediate
ii.    Time Triggered
d.    Salesforce will evaluate the rule when record is
i.    Created
ii.    Created, and every time its edited
iii.    Created and every time its edited to subsequently meet criteria

40.  What is Approval Process?
a.    Salesforce approval process is an automated process and your organization can use to approve records in Salesforce, An approval process is combination of steps for a record to be approved and person has to approve it each step.A step can apply to all the records to that object or just record that meets the certain criteria. An approval process also specifies the actions to take when a record is approved, rejected, recalled, or first submitted for approval.

41.  What is VIEWSTATE and How to reduce View State ?
a.    It is a state of your VF page, which help Salesforce to regenerate VF page when it come back from server. For example when you fill the page and when some required filled is not filled but you click on save but when the page load it remain same as it was earlier this is what it done with View State. It has a limit of 135KB.
i.    To avoid exceed limit use less form in single VF page.
ii.    Decrease collection items if it is of no use.
iii.    Define private if it is not used in VF page
iv.    Avoid SOQl queries in your Apex controller getter methods
v.    Instead of using two forms use apex:actionRegion

42.  What is Data loader?
a.    It is an application for the bulk import or export of data.

43.  Difference between actionFunction, actionSupport & actionPollar
a.    actionFunction – It call apex method from javascript
b.    actionSupport – it call apex method on some event
c.     actionPollar – for refreshing the component on certain interval of time

44.  What are the bindings in visualforce?
a.    Data Binding – which refer to the data set in the controller.
b.    Action Binding – which refer to action methods in the controller.
c.     Component Bindings - which refer to other Visualforce components.

45.  What is recordSetVar?
a.    The value of the attributes indicates name of the set of records passed to the page means collection record

46.  What is Pagination in VF ?
a.    Breaking the page into separate pages within salesforce is the pagination

47.  What are the action in VF?
           a. actionFunction, actionSupport, actionPolar

48.  What is actionRegion?
a.    An area of a Visualforce page that demarcates which components should be processed by the Force.com server when an AJAX request is generated. Only the components in the body of the <apex:actionRegion> are processed by the server, thereby increasing the performance of the page.

49.  apex:Repeat vs apex:DataTable vs apex:PageBlockTable
a.    apex:pageBlockTable represents a table formatted and styled to look like a related list table.
b.    apex:dataTable is an unstyled table suitable for use anywhere outside of a apex:pageBlock (but may be used within one)
c.     apex:dataList renders a ul or ol element (unordered or ordered list, respectively), with li (list item) elements comprising the rows
d.    apex:repeat allows any arbitrary output based on a template.

50.  Can we create dashboard using VF page? What compoenents we use?
a.    We can create Dashboard using VF page but only when it not use StandardController. We can add up to 20 components
b.    The components we use are <apex:PanelGrid>, <apex:actionSupport>

51.  How you will add an attachment from VF page? Tell the components names to achieve this?
a.    By using <apex:inputFile>

52.  Difference between rendered, reRender and renderAs
a.    Rendered – It’s a Boolean value and the default value is always true, It works like “display” property of CSS. It is used to place condition for a component(field, outputpanel, section etc), that will show or not on page.
b.    Rerender After Ajax which component should be refreshed. For this we need to assign ID to field, sections or a block. Its available on command link, commandbutton, actionSupport etc.
c.     RenderAs It is used for visualforce page show as PDF, Excel or any other standard document format.

53.  Difference between controller, Standard Controller and extension
a.    Controller It is also called custom controller. In this we define controller in Apex where we can define our own functions
b.    StandardController It have same functionality we need to use the Standard Object and custome object function . Like (save, edit, delete, cancel) we use StandardController in this.
c.     Extension When we want to use StandardController functionality and also want to implement own function we use Extension where we write logic in Apex

54.  What are some Apex Best Practice?
a.    https://developer.salesforce.com/page/Apex_Code_Best_Practices

55.  What is sObject?
a.    Any generic object in Salesforce is sObject.

56.  What is Getter and Setter
a.    Getter It is used to pass data from Apex/Controller to VF page
b.    Setter Is used to pass data from VF page to Controller

57.  What are all data types in Apex
a.    Integer
b.    String
c.     Date
d.    Long
e.    Boolean
f.      Time
g.    Blob – collection of binary data which is stored as object. We use when we want some attachment
h.    sObject
i.      Collection(Map, List, Set)

58.  Explain some String Method
a.    Contains – Returns true if it contains the given substring
b.    Equals – return true id both string are equal
c.     Startwith – return true if it start with given string

59.  Define collection (Map, Set, List)
a.    List It is a ordered collection of primitives, user defined objects, sObjects, Apex objects or other objects. It can be multidimensional to 5 levels. Some methods are
i.    size()
ii.    remove()
iii.    add()
iv.    get()
v.    clear()
vi.    set()
vii.    sort()
b.    Set A set is a collection unique, unordered elements of primitive data types or sObject. It does not contain duplicate element. You can safely try to add the same element to a Set more than once and it will just disregard the duplicate (without throwing an Exception). However, there is a slight twist when dealing with sObjects. Uniqueness of sObjects is determined by comparing fields in the objects. The uniqueness is determine by the field values. Some of the methods are
i.    add()
ii.    remove()
iii.    contains(setElement)
iv.    remove(setElement)
v.    size()
c.     Map It is a collection of key value pair. Keys can be any primitive data type while values can include primitives, Apex objects, sObject and other collection.
i.    Map<Integer, String> M1 = new Map<Integer, String>();
M1.put(1, ‘First Name’);

60.  Different ways for writing collections(List, Set, Map) (Please refer the below link)
a.    https://blog.jeffdouglas.com/2011/01/06/fun-with-salesforce-collections/

61.  What is Access Modifiers?
a.    Private – In this methods or variables is access only within the Apex class
b.    Public – In this, methods or variable is access in whole application
c.     Global – In this methods or variables is access outside the application

62.  What is Sharing Model?
a.    With Sharing – If a class is specified with ‘With Sharing’ keyword then it will restrict the user to get executed where it have no permission and access. Means all sharing rule applicable here.
b.    Without Sharing In this case sharing rule is not applicable. This is the default sharing mode

Default - Without Sharing
Now, Apex class always execute in system context i.e. Apex code has access to all objects and fields irrespective of the logged in User. Example - lets consider you have VF page in which you are showing certain fields as columns. Lets see one column says "Sales Rep Performance" which displays a flag in red, green and yellow. Now ideally this field should not be visible whenever a Sales Rep accesses this page (consider this as business requirement). But it is always visible if the class has no keyword specified or if a class has without sharing specified.
Now once the class is "with sharing" the object permissions, field-level security, sharing rules are applied for the current user and fields which should not be visible/accessible and not visible or accessible.

Important
-       if a method is defined in a class declared with 'with sharing' is called by a class declared with 'without sharing', the method will execute with sharing rules enforced.
-       The class doesn’t enforce sharing rules except if it acquires sharing rules from another class.
Ex. Class A (with sharing) calls a method from Class B(Without sharing) then complete context is 'with sharing'
-       Inner classes do not inherit the sharing setting from their container class.

63.  What is DML?
a.    Data Manipulation Language – It is used to retrieve, store, modify, insert, update, and delete data in database

64.  Difference between DML and Database method
a.    In DML partial update is not allowed but it is allowed in Database method.

65.  What is the order of execution when record saved?
a.    Old record loaded from database (or initialized for new inserts)
b.    New record values overwrite old values
c.     All Apex before triggers (EE / UE only)
d.    System validation rules
e.    Custom validation rules
f.      Record saved to database (but not committed)
g.    Record reloaded from database
h.    All Apex after triggers (EE / UE only)
i.      Assignment rules
j.      Auto-response rules
k.     Workflow rules*
l.      Escalation rules
m.   Parent Rollup Summary Formula value updated (if present)
n.    Database commit
o.    Post-commit logic (sending email)

66.  What is SOSL?
a.    Salesforce Object Search Language – Search the text string across the object and across the field
Example = [FIND ‘ABC*’ IN ALL FIELDS RETURNING HOTEL_C (ID, HOTEL_C.NAME)];

67.  What is Trigger?
a.    It is an Apex script that executes before or after specific data manipulation language. There are two types of Triggers
- Before Triggers – It is applied when we are working on same object. It is used to update or validate record values before it saved to database
- After Triggers Is is applied when we use trigger for other objects. It is used access value of the record that are stored in the database

68.  What is Bulk Trigger and its advantage?
a.    All triggers are bulk triggers by default. We can say it can process multiple records at a time.

69.  Advantages of Trigger over Process Builder.
a.    Process Builders cannot handle before DML It executes after a record has been created or updated. Whereas Apex triggers can handle both before and after DML operations.
b.    Process Builder cannot handle delete and undelete DML. Whereas Apex triggers can handle all DML operations.
c.     An error reported in Process Builder is more generic which makes it difficult to find the origin of the error. With Apex triggers, exception handling can be made more specific.
d.    It is all or none in case of Process Builder failure. But with Apex triggers partial success is possible.

70.  What is Code Coverage ?
a.    Code coverage indicates how many executable lines of code in your classes and triggers have been exercised by test methods.
b.    Code coverage percentage is a calculation of the number of covered lines divided by the sum of the number of covered lines and uncovered lines.
c.     System.debug() statements and curly brackets are excluded when they appear alone on one line.

71.  What is recursive workflow and recursive trigger. How can we avoid it?
a.    Recursive workflow is re-evaluating the rules on same object again again. To avoid that use criteria – created, and edited any time it’s edited to subsequently meet criteria
b.    Recursive Trigger - Recursion occurs when same code is executed again and again. It can lead to infinite loop and which can result to governor limit sometime. To avoid recursive trigger in salesforce use Static Variable

72.  Types of Events in Triggers
a.    beforeInsert
b.    afterInsert
c.     beforeUpdate
d.    afterUpdate
e.    beforeDelete
f.      afterDelete
g.    afterUndelete

73.  Explain Context Variables in Triggers
a.    It allow developers to access run time context
i.    isInsert
ii.    isUpdate
iii.    isDelete
iv.    isBefore
v.    isAfter
vi.    new
vii.    newMap
viii.    old
ix.    oldMap
x.    size
xi.    isExecuting
xii.    isUndelete

74.  What are Transaction control in Salesforce (SavePoint & Rollback)?
a.    Savepoint specify the state of database at that time so when DML operation occur after savepoint can be rollback to that point when unsuccessful.

75.  Explain exception in Apex and define some
a.    Exception denotes the error that disrupts the normal flow of code execution. Some are
i.    DMLException
ii.    Emailexception
iii.    LimitException
iv.    ListException
v.    MathException
b.    It can be handled by Try Catch in apex

76.  Can we define SOQL in constructor ? And can we define DML in constructor
a.    Yes we can define SOQL in constructor but we cannot define DML in constructor

77.  What is Standard Set Controller? Name some of its method
a.    StandardSetController objects allow you to create list controllers similar to, or as extensions of, the pre-built Visualforce list controllers provided by Salesforce.
List<account> accountList = [SELECT Name FROM Account LIMIT 20]; ApexPages.StandardSetController ssc = new ApexPages.StandardSetController(accountList);

78. What is Standard List Controller?
a.    Standard list controllers allow you to create Visualforce pages that can display or act on a set of records

79.  In how many ways we can call controller from VF page?
a.    apex:page action
b.    apex:commandLink
c.     apex:commandButton
d.    apex:actionFunction
e.    apex:actionSupport

81.  What is Offset?
a.    When expecting many records in a query’s results, you can display the results in multiple pages by using the OFFSET clause on a SOQL query. For example, you can use OFFSET to display records 51–75 and then jump to displaying records 301–350. Using OFFSET is an efficient way to handle large results sets.

82.  What is query limitation and what is offset max value?
                   a. Total number of records retrieved by SOQL queries 50,000

83.  What is Wrapper Class?
a.    It is a class whose instances are collection of other objects

84.  What is Class?
a.    Class is a blue print from which Objects are created. An object is an instance of class. (Object is nothing but the real world things which need real data)

85.  OOPS in Apex?
a.    Any language which supports the following concepts are called OOPs based languages.
i.    Programming Elements – Data (Variable) + Instructions(Methods)
b.    Encapsulation Binding the programming element into single unit.
i.    Achieved by CLASS & INTERFACE.
c.     Abstraction Hiding the programming elements
i.    Achieved by Access Specifier (Private, Public, Global)
d.    Polymorphism A single entity existing using many forms. Like + operator use in Addition as well as concatenate
i.   Achieve by Overriding & Overloading
Overloading occurs when two or more methods in one class have the same method name but different parameters.
Overriding means having two methods with the same method name and parameters
e.     Inheritance Inheriting the property from parent class to child class. i. Achieve by EXTENDS
f.     Class – It is a collection of functions, properties, behaviour
g.    Methods – It is nothing just the function and logic we define in class.

87.  Synchronization
--------------------------------------------------
Admin
Development
sObject
Class
Fields
Variable
Buttons and links etc
Methods & Functions
Records
Object(Instance Variable of class)
Multiple Records
Collections(List,Set,Map)

88.  What is the difference between non-static and static?
a.    By default all the variables and methods are non-static.Scope of the non-static variables or methods is within the scope of the same object.
b.    We can declare variables and methods as static by using static keyword. Scope of the static variables and methods is throughout the transaction. Static variables and methods, we can directly call with class name (we cannot access static variables and methods with object name).

89.  What is Batch in Salesforce? Explain flow on batch
a.    Batch Apex is used to run large jobs (think thousands or millions of records!) that would exceed normal processing limits. Using Batch Apex, you can process records asynchronously in batches (hence the name, “Batch Apex”) to stay within platform limits.
b.    To write a Batch Apex class, your class must implement the Database.Batchable interface and include the following three methods
start
Used to collect the records or objects to be passed to the interface method execute for processing.
execute
Performs the actual processing for each chunk or “batch” of data passed to the method.
finish
Used to execute post-processing operations (for example, sending an email) and is called once after all batches are processed.

90.  Difference between Async and Sync apex?
a.    Synchronous: In a Synchronous call, the thread will wait until it completes its tasks before proceeding to next. In a Synchronous call, the code runs in single thread.
i.  Example – Trigger, Custom Controller, Controller Extensions
b.    Asynchronous: In a Asynchronous call, the thread will not wait until it completes its tasks before proceeding to next. Instead it proceeds to next leaving it run in separate thread. In a Asynchronous call, the code runs in multiple threads which helps to do many tasks as background jobs.
i.    Example – Batch, @future Annotation, Queueable Apex

91.  What is Batch default size and max size?
a.    Batch default size is 200 & its Max size is 2000

92.  What is CRON Trigger? Give Example
a.    CornTrigger is an object in salesforce which contains schedule information for a scheduled job .Basically it hold the CronExpression,NextFireTime,LastFireTime,StartTime ,End Time ,status etc .
b.    List<CronTrigger> jobs = [Select Id, CronJobDetail.Name, State, NextFireTime From CronTrigger limit 10];
for(CronTrigger job : jobs)
{
System.debug(job);
}
c.     You can only have 100 scheduled Apex jobs at one time.
d.    The maximum number of scheduled Apex executions per a 24-hour period is 250,000 or the number of user licenses in your organization multiplied by 200, whichever is greater.
e.    “Seconds Minutes Hours Day_of_month Month Day_of_week optional_year”



93. What is Schedulable batch?
a.    To invoke the apex class at particular time we use Schedular which first implements the schedulable interface for the class then specify the schedule using either the schedule apex page or the System.schedule method.
Global class Sche_AccountDescUpdate implements Schedulable{ Global void execute (SchedulableContext scMain){
Batch_AccountDescUpdate batchClass = new Batch_AccountDescUpdate(); ID idBatch = Database.executeBatch(batchClass, 200);
}
}
You cannot release updated versions of any code that is used by your scheduled job without first deleting your scheduled job.

94.  What is Future Method (Future annotation)
a.    Future Apex is used to run processes in a separate thread, at a later time when system resources become available.
b.    A future method runs in the background, asynchronously. You can call a future method for executing long-running operations. If you want to make the execution of the apex program to run asynchronously then we make use of future method.When you specify future , the method executes when Salesforce has available resources.
i.    Methods with the future annotation must be static methods
ii.    can only return a void type
iii.    The specified parameters must be primitive data types, arrays of primitive data types, or collections of primitive data types
iv.    Methods with the future annotation cannot take sObjects or objects as arguments.
v.    You can invoke future methods the same way you invoke any other method.
However, a future method can’t invoke another future method
vi.    No more than 50 method calls per Apex invocation

95.  Why objetcs can’t be passed as arguments in Future method?
a.    The reason why objects can’t be passed as arguments to future methods is because the object can change between the time you call the method and the time that it actually executes. Remember, future methods are executed when system resources become available. In this case, the future method may have an old object value when it actually executes, which can cause all sorts of bad things to happen.

96.  What is the use of Database.stateful in batch class?
a.    If your batch process needs information that is shared across transactions, one approach is to make the Batch Apex class itself stateful by implementing the Stateful interface. This instructs Force.com to preserve the values of your static and instance variables between transactions. In Short if you need to send a mail to check number of record pass and failed in batch job counter in that case you can use Stateful batch job.

97.  What is Queueable Apex?
a.    This interface enables you to add jobs to the queue and monitor them, which is an enhanced way of running your asynchronous Apex code compared to using future methods.
b.    For Apex processes that run for a long time, such as extensive database operations or external Web service callouts, you can run them asynchronously by implementing the Queueable interface and adding a job to the Apex job queue.
public class AsyncExecutionExample implements Queueable { public void execute(QueueableContext context) { Account a = new Account(Name='Acme',Phone='(415');
                         insert a;
        }
         }
------------------------------
ID jobID = System.enqueueJob(new AsyncExecutionExample());
---------------------------------------

98.  What is Test Class?
a.    The Apex testing framework enables you to write and execute tests for your Apex classes and triggers. Apex unit tests ensure high quality for your Apex code and let you meet requirements for deploying Apex.
b.    To deploy your code or package at least 75% of apex code must be covered by tests, and all those tests must pass.
c.     To access org data, annotate the test method with @isTest(SeeAllData=true).
d.    Syntax of writing Test Class
i.    @isTest static void testName() {
//   code_block
}
ii.    static testMethod void testName() {
//   code_block
}
Sample Class
@isTest
private class MyTestClass {
@isTest static void myTest() {
// code_block
}
}

99.  Difference between System.assertEquals() & System.assert()
a.    System.Assert accepts two parameters, one (mandatory) which is the condition to test for and the other a message (optional) to display should that condition be false.
b.    System.AssertEquals and System.AssertNotEquals both accepts three parameters; the first two (mandatory) are the variables that will be tested for in/equality and the third (optional) is the message to display if the assert results in false.

100.               What is Test Suite?
a.    A test suite is a collection of Apex test classes that you run together

101.               What is System.RunAs ()?
a.    The runAs method ignores user license limits. You can create new users with runAs even if your organization has no additional user licenses. It only runs in test methods

102.               How can we prevent to cross the governor limit from soql query ?
a.    Avoid SOQL in inner loop
b.    For mass records use batch

103.               Explain Test.setPage ()?
a.    Test.setPage() method in Salesforce is used to set the context to current page, normally used for testing the Visualforce controller in test classes.

104.               What is StartTest & stopTest?
a.    StartTest - The startTest method marks the point in your test code when your test actually begins. Any code that executes after the call to startTest and before stopTest is assigned a new set of governor limits.
b.    StopTest - The stopTest method marks the point in your test code when your test ends.

105.               Ways to Integrate :-
a.    User Interface Combine the UIs of two or more apps to create composite apps with little or no rework on the UI of each individual app. One example is using force.com Canvas
b.    Based on business logic - It uses Apex Web Services for Inbound and Apex Callouts for Outbound. It typically handles a scenario where business logic is spread across several applications to implement the complete end-to-end business process. An example would be building complex logic on the data received before committing it into Salesforce
c.    Based on Data - It uses SOAP APIs and REST APIs. It typically handles data synchronization requirements, where one application in an enterprise acts as the primary source for a particular business object, like Account.

106.               Different type of Integration
a.    SOAP API – This API is useful to integrate your Salesforce organization data with other application using SOAP.
b.    REST API - This is useful to access other objects in your Salesforce organization using REST.
i.    GET - Retrieve data identified by a URL.
ii.    POST - Create a resource or post data to the server.
iii.    DELETE - Delete a resource identified by a URL.
iv.    PUT - Create or replace the resource sent in the request body.

107.               SOAP Method and Process (Diagram)
a.    SOAP – Simple Object Access Protocol
b.    REST – Representational State Transfer


108.               What is Web Service?
a.    It is a code or language for communicating between two application

109.               What is Callouts?
a.    An Apex callout enables you to tightly integrate your Apex with an external service by making a call to an external Web service or sending a HTTP request from Apex code and then receiving the response

110.               What is JSON
a.    JSON stands for JavaScript Object Notation. JSON is light weighted than XML

111.               What is Remote Site Settings?
a.    Remote site settings is used to authorize the endpoint and allow us to whom integrate(end user).
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