What is QueryLocator in Salesforce?
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. To add more – Database.
Can I use for update in SOQL using Database QueryLocator?
Usage. You cannot use the FOR UPDATE keywords with a getQueryLocator query to lock a set of records. The start method automatically locks the set of records in the batch.
How many records can be fetched using Database QueryLocator in start method?
QueryLocator can retrieve up to 50 million records. A maximum of 50 million records can be returned in the Database. QueryLocator object.
What is the difference between Database query () and Database getQueryLocator?
Database. query() is used to construct dynamic query instead of using SOQL query where as Database. getQueryLocator() is the return type of start method of a Batch class.
What is the difference between Database QueryLocator and Iterable?
With the QueryLocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed and you can query up to 50 million records. However, with an Iterable, the governor limit for the total number of records retrieved by SOQL queries is still enforced.
How do I query more than 50000 records in Salesforce?
You cannot retrieve more than 50,000 records your SOQL calls in a single context. However, with Batch Apex your logic will be processed in chunks of anywhere from 1 to 200 records in a batch. You’d need to modify your business logic to take the batching into account if necessary.
What is bounded and unbounded query in Salesforce?
* Bounded Queries – Where we have a well-defined set of fields, for example, all standard fields. * Unbounded Queries – Where we have a set of fields that are not predetermined, for example, all fields or all custom fields.
What is difference between QueryLocator and Iterable in Salesforce?
What is the difference between Iterable and Database QueryLocator?
QueryLocator() and Iterable in BatchApex?” – The answer depends on your need, if you want to run a batch on records that can be filtered by SOQL then QueryLocator is preferable, but if records that you want to be processed by batch cannot be filtered by SOQL then you will have to use Iterable.
Can I call future method from batch class?
Interviewee: No you can’t, because Calling a future method is not allowed in the Batch Jobs.
How many batches can run in parallel Salesforce?
5 batch jobs
Up to 5 batch jobs can be queued or active concurrently. The maximum number of batch Apex method executions per 24-hour period is 250,000, or the number of user licenses in your org multiplied by 200—whichever is greater.
How do I bypass too many SOQL queries 101 in Salesforce?
Resolve the “Too many SOQL queries: 101” error To fix the issue, change your code so that the number of SOQL fired is less than 100. If you need to change the context, you can use @future annotation which will run the code asynchronously.
What is the difference between bound and unbound?
So, a bound form has a RecordSource, a table or query to which the form is “tied” or “based”. An unbound form does not have a RecordSource, that doesn’t mean it can’t contain data, but the programmer will have to bring that data in manually, where a bound form automatically is associated with some data.
What is static and dynamic SOQL in Salesforce?
Static SOQL is one which you write in square brackets. It is good to use when you didn’t have any dynamic changes in the soql query. Dynamic SOQL refers to the creation of a SOQL string at runtime with Apex code.
Can we call future method from trigger?
Interviewer: Can I write a future call in Trigger? Interviewee: Yes, you can.
Can a Queueable from future method?
Future methods cannot be monitored, but queueable apex can be monitored using the job id which is returned by System. enqueueJob() In execution cycle, you cannot call from one future method to another future method. Its achieved inqueueable class by using the Chaining Jobs.
What are the methods of querylocator?
The following are methods for QueryLocator. All are instance methods. Returns the query used to instantiate the Database.QueryLocator object. This is useful when testing the start method. Returns a new instance of a query locator iterator. Returns the query used to instantiate the Database.QueryLocator object.
Can I use a custom metadata query as a querylocator?
If ten QueryLocator cursors are opened when a client application with the same logged-in user attempts to open a new cursor, then the oldest of the ten cursors is released. You can’t use a custom metadata query as a queryLocator.
What is the difference between querymore () and querylocator ()?
A QueryLocator represents a server-side cursor. A queryMore () call on a parent object invalidates all child cursors in the previous result set. If you need the results from the child, you must use queryMore () on those results before using queryMore () on the parent results.
How to get querylocator children records from database?
Database.getQuerylocator ( [select Id, Name, (select Name from Account) from Contact]); Thanks in advance. Here is a link to the short doc on QueryLocator object. The children records can be accessed in the execute method of Batch Apex. For example:
https://www.youtube.com/watch?v=vIfziz9Sk0s