how to reduce heap size in salesforce

by Piper Yundt Published 2 years ago Updated 2 years ago

Look for heap size in debug logs. If heap size is approaching the limit, investigate it and refactor the code.
Use the 'Transient' keyword with variables. It is used to declare instance variables that cannot be saved, and shouldn’t be transmitted as part of the view state for a ...
Use Limit methods . ...

Reduce heap size during runtime by removing items from the collection as you iterate over it. 5. Use SOQL for loops. To avoid heap size limits, developers should always use a SOQL "for" loop to process query results that return many records.

Full Answer

What is heap size in Salesforce?

Heap size in actual is the count of memory used by the variables, object instances in an Apex class. In order to store these objects & variables, memory is allocated in Salesforce which is derived from allocated Heap.

How much value can you gain by managing your heap size?

With all these findings, you must have gained an insight into managing your heap size and its importance. Tests on various production orgs demonstrated that you could easily gain more than 10% on existing code by managing indentation (using tabs) and removing trailing white spaces on the line of code (this can be automated).

How to avoid heap size limits in soql queries?

To avoid heap size limits, developers should always use a SOQL "for" loop to process query results that return many records. Was this information helpful? Let us know so we can improve!

How to monitor/manage the heap during execution?

Use heap limits methods in your Apex code to monitor/manage the heap during execution. Limits.getHeapSize () – Returns the approximate amount of memory (in bytes) that has been used for the heap in the current context.

How do I resolve heap size in Salesforce?

Best practices for running within the Apex heap sizeDon't use class level variables to store a large amounts of data.Utilize SOQL For Loops to iterate and process data from large queries.Construct methods and loops that allow variables to go out of scope as soon as they are no longer needed.

What is heap size limit in Salesforce?

Salesforce enforces an Apex Heap Size Limit of 6MB for synchronous transactions and 12MB for asynchronous transactions. The "Apex heap size too large" error occurs when too much data is being stored in memory during processing.

What is heap memory in Salesforce?

What is the size of heap?

The default heap size is 1 MB. The linker rounds up the specified value to the nearest 4 bytes. The optional commit argument specifies the amount of physical memory to allocate at a time. Committed virtual memory causes space to be reserved in the paging file.

How do I overcome governor limits in salesforce?

How can you avoid Salesforce Governor Limits?Do not have DML statements or SOQL queries in our FOR loop.Try not to use SOQL or DML operations in the loop.Try to bulkify the code and helper methods.Query large data sets.Use Batch Apex if we want to process 50,000 records.Streamline various triggers on the same object.More items...•

How do I increase heap size?

To increase the Application Server JVM heap sizeLog in to the Application Server Administration Server.Navigate to the JVM options.Edit the -Xmx256m option. This option sets the JVM heap size.Set the -Xmx256m option to a higher value, such as Xmx1024m.Save the new setting.

What is VM heap size?

Heap size is that amount of RAM that can be allocated. Each app is on a tiny Dalvik Virtual Machine. Each VM will have some heap space allocated. And, there is a pre-defined heap-size settings inside /system/build. prop file for each device.

What is heap memory?

“Heap” memory, also known as “dynamic” memory, is an alternative to local stack memory. Local memory is quite automatic. Local variables are allocated automatically when a function is called, and they are deallocated automatically when the function exits. Heap memory is different in every way.

What is JVM heap size?

By default, the JVM heap size is 1GB, which is usually enough to accommodate the data used by Task Engine. However, larger heap size may be required under some circumstances, for example, when the average size of the parameters in a task is very large.

How do I reduce my heap?

Preferably the heap should be at least twice the size of the total amount of live objects, or large enough so that the JVM spends less time garbage collecting the heap than running Java code. To allow the heap to grow and shrink depending on the amount of free memory in your system, set -Xms lower than -Xmx .

How do I check my heap memory?

You can verify that the JVM is using the increased Java heap space:Open a terminal window.Enter the following command: ps -ef | grep java | grep Xmx.Review the command output.

What happens if heap memory is full?

When the heap becomes full, garbage is collected. During the garbage collection objects that are no longer used are cleared, thus making space for new objects. Note that the JVM uses more memory than just the heap.

Solution of The Error

Avoid the use of class-level variables for large amounts of data for those Just those variables which are utilized on the Visualforce page ought to be public rest all variables ought to be private, if not utilized by some other class.

Put Your Objects on a Tight routine

On the off chance that the articles in your collection contain related objects (i.e., Account objects with various related Contacts for each) ensure the objects that are related, just contain the fields which are really required by your content.

Use the Transient Keyword

Take a stab at utilizing the "Transient" watchword with factors in your regulators and expansions. The transient watchword is utilized to announce occasion factors that can't be saved, and shouldn't be sent as a component of the view state for a Visualforce page.

Use SOQL For Loops

SOQL "for" Loops vary from standard SOQL articulations due to the methods they use to recover sObjects. To evade load size limits, developers ought to consistently utilize a SOQL "for" loops to handle query results that return multiple records.

Focus on Heap

At the point when your contents run you can see the stack size in the troubleshooting logs. In the event that you notice your stack moving toward the breaking point, you should research why and attempt to refactor your code in a similar manner.

What is a heap size in Salesforce?

Why do you need to keep a cap on Apex?

Since all the debug statements are counted against the code length, it is necessary to keep a cap on them in order to limit the consumed heap size of the Apex code. It is fine to use them while doing the apex development but should be removed or minimized in the final production version of the code.

Scenario

I'm trying to send a lot of data from Apex to VisualForce Page via JS remoting because I want to create an Excel file , so just for testing purpose I uploaded a text file (4.87 MB, 5110400 Characters) as a static resource I got the file in Apex added it to a list of string.

Problem

I added the body of Static Resource to the list twice, below is my Apex and VisualForce code:

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