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Can we use Database QueryLocator in Apex?
Represents the record set returned by Database. getQueryLocator and used with Batch Apex.
How many records can be returned in the Database QueryLocator?
50 million records
A maximum of 50 million records can be returned in the QueryLocator object. If more than 50 million records are returned, the batch job is immediately terminated and marked as Failed.
What is Database QueryLocator?
Database.QueryLocator object when you are using a simple query (SELECT) to generate the scope of objects used in the batch job. If you use a querylocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed but we can retrieve up to 10,000 records.
What is the use of Database QueryLocator?
A batch Apex class must implement the ‘Database. Batchable’ interface and should include the following methods: start, execute and finish. QueryLocator is the most commonly used object to fetch records without pre-processing, returns up to 50 million records.
What is iterator in Salesforce?
Apex batch classes can return an iterator to process large volume of data that are not directly queried from database/sobjects. These iterators can be classes implementing Iterable interface or standard apex data strucutres like list.
How to create a query locator in apex?
Using the Database.QueryLocator object bypasses the governor limit for the total number of records retrieved by SOQL queries. One could implement one of the following methods to get the QueryLocator:
When to use querylocator to bypass Governor limit?
Use the Database.QueryLocator object when you are using a simple query (SELECT) to generate the scope of objects used in the batch job. If you use a querylocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed.
What is the Governor limit for batch apex?
If you use a querylocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed. For example, a batch Apex job for the Account object can return a QueryLocator for all account records (up to 50 million records) in an organization.
How to determine the execution limit in apex?
Limits apply individually to each testMethod. To determine the code execution limits for your code while it’s running, use the Limits methods. For example, you can use the getDMLStatements method to determine the number of DML statements that have already been called by your program.