To use the tool, enter your query and click the Query Plan button in the Query Editor. The Query Plan window displays all query operations and the cost of each. Cardinality The estimated number of records that the leading operation type would return. For example, the number of records returned by an index.
Full Answer
What is the default page context in Visualforce?
As shown in earlier examples, the default page context—that is, the record that provides the source of data displayed on the page—is controlled by a query string parameter named idin the page URL. You can also get and set query string parameters in the Visualforce markup.
What is a Salesforce Visualforce page?
A Visualforce page is similar to a standard web page, except Visualforce uses powerful Salesforce features to integrate with other Lightning functionalities and tools. In Visualforce, one of the best tools to use is the Lightning Design System.
How do I create a Visualforce page in trailhead?
Use the Developer Console in your Trailhead Playground to create a new Visualforce page using Lightning Design System apex tags. In your playground, click Setup and select Developer Console. In Developer Console, select File > New > Visualforce Page. Name the page ContactForm and then click OK.
How do I create a contact form in Visualforce?
In Developer Console, select File > New > Visualforce Page. Name the page ContactForm and then click OK. Enter Hello between the apex:page tags. Your page’s markup should look like this: In the Developer Console, save the page by selecting File > Save. Above the code line numbers, click Preview.
How do I use the Query Plan tool in Salesforce?
Inside Salesforce, go to the Setup Menu and launch the Developer Console. By default the Query Plan tool is off so we need to go into the Developer Console Preferences and enable it. From the Preferences Menu, set the Query Plan option to "True" and click Save.
How do I query a VF page?
List of visualforce page created by users:Go To Query Editor in Developer Console.Run the below Query. SELECT Name, MasterLabel,namespaceprefix, ApiVersion, CreatedDate FROM ApexPage WHERE namespaceprefix = NULL.Above Query Gives you list of all visualforce page created by users in organization.
How do I enable a Query Plan in Salesforce?
If custom indexes are available for your organization, use query plans to help you decide when to request a custom index from Salesforce Support. To enable the Query Plan button in the Query Editor, click Help | Preferences, set Enable Query Plan to true , and then click Save.
How do I run a SOQL query in Salesforce?
Execute a SOQL Query or SOSL SearchEnter a SOQL query or SOSL search in the Query Editor panel.If you want to query tooling entities instead of data entities, select Use Tooling API.Click Execute. ... Warning If you rerun a query, unsaved changes in the Query Results grid are lost.
How do I give a user access to a Visualforce page in Salesforce?
Go to Setup | Administration | Users | Profiles.Click the Profile Name.Scroll down to 'Enabled Visualforce Page Access' related list and click Edit.Add the Visualforce pages.Click Save.
What are the three languages used in the Visualforce page?
Visualforce lets you create and customize pages in Salesforce as well as integrate with other standard web technologies, including HTML, CSS, and JavaScript.
What is Query Plan tool in Salesforce?
The Query Plan Tool will show a list of available plans that our Query Optimizer can use for the query provided and will be arranged by cost ascending. Each Plan will contain information on Cardinality, Operation Type, Cost, sObject Type, and more.
How do I optimize SOQL performance?
The performance of the SOQL query improves when two or more filters used in the WHERE clause meet the mentioned conditions. The selectivity threshold is 10% of the records for the first million records and less than 5% of the records after the first million records, up to a maximum of 333,000 records.
What is dynamic SOQL in Salesforce?
Dynamic SOQL refers to the creation of a SOQL string at run time with Apex code. Dynamic SOQL enables you to create more flexible applications. For example, you can create a search based on input from an end user or update records with varying field names. To create a dynamic SOQL query at run time, use the Database.
What is the difference between SOQL and SOSL?
SOSL & SOQL. The chart below describes the differences....Difference between SOSL and SOQL search types.SOQLSOSLSearch Focus:Accuracy. Gives full set of results that match criteria.Relevance & Speed. Similar to Google Search. Weightage placed on recently viewed records.Search ScopeCan search 1 object at a time.Can search multiple objects at a time.3 more rows
Is SOSL faster than SOQL?
Performance Considerations Both SOQL WHERE filters and SOSL search queries can specify text you should look for. When a given search can use either language, SOSL is generally faster than SOQL if the search expression uses a CONTAINS term.
What is the difference between SQL and SOQL?
In SQL, the data is stored in database tables whereas the data in Salesforce is stored in the form of objects. SOQL is used primarily for querying the Salesforce database and retrieving the records. It does not allow data modifying statements like UPDATE, INSERT, etc.
Reasons to use the Query Plan Tool
Use this tool to check the Query Plan for any SOQL queries that execute slowly. It will provide you with insight on the different plans and should you have some of the filters indexed, provide the cost of using the index compared to a full table scan.
What does it all mean?
The Query Plan Tool will show a list of available plans that our Query Optimizer can use for the query provided and will be arranged by cost ascending.
Indexed field does not appear in the list of plans
If the query you provided contains an Indexed field in the filters, the plan will be shown for that field only if you are using a supported operation against that field.
Examples and how to interpret Query Plan results
The following examples uses 2 indexed fields. A checkbox ( InActiveAcc__c) and a Picklist ( Account_Hierarchy__c) on the Account sObject.
Where can we use this Visualforce Page?
Don't forget to check out: Get Selected Records from ListView in Visualforce Page | GETRECORDIDS JavaScript | StandardSetController Salesforce
What is a controller in VisualForce?
A Controller is an apex class that is used to implement all the logic of a Visualforce page without holding/supporting the standard functionality.
How to make Visualforce page functional?
To make your Visualforce page functional, you either use a standard controller or a custom controller. Deciding which controller to use depends on your project. You can extend the standard controller to add more functionality related to the specific standard object, or you can create a custom controller from scratch and define functionality ...
How is Visualforce created?
Visualforce pages are created by writing code in specific languages. This is often referred to as markup. Visualforce pages are so versatile, you can mix them with Apex, HTML, CSS styles, and even JavaScript. This gives you more flexibility in how you implement your app’s user interface on the Salesforce platform.
What Is Visualforce?
Visualforce is a web development framework that gives developers the ability to build custom user interfaces for mobile and desktop apps on the Salesforce platform. A Visualforce page is similar to a standard web page, except Visualforce uses powerful Salesforce features to integrate with other Lightning functionalities and tools.
What is a standard controller in Salesforce?
Standard Controller. A standard controller exists for every Salesforce standard object. Standard controllers are powerful classes prewritten for you. Once a standard controller has been added to a Visualforce page, that page will have basic record operation functionality such as create, read, update, and delete.
What is the best tool to use in Visualforce?
In Visualforce, one of the best tools to use is the Lightning Design System . The Lightning Design System is prepackaged with base Lightning components used to create the shiny Lightning style you see throughout the platform.
Can you use Lightning Web Components with Salesforce?
Since Lightning Web Components is the preferred way to build UI with Salesforce, head over to the Migrate from Visualforce to Lightning Web Components trail to learn how to use LWC and comply with current web standards. Otherwise, continue with this badge to learn more about Visualforce.
Can you add markup to Visualforce?
Congratulations! You just created your first Visualforce page. Now you can add markup to your page to make it functional for whatever you need. In the next unit, let’s give the page some functionality and Lightning style.