Governor Limits in salesforce are of different types for different types of resources like:

Per Transaction Apex limits: These limits count for each Apex transaction.

Per Transaction certified Managed Package Limits: Certified managed packages are the managed packages that have passed the security review for AppExchange.

Lightning Platform Apex Limits: Limits enforced by the Lightning Platform.

Static Apex Limits
Size Specific Apex Limits

Execution Governors and Limits

Because Apex runs in a multitenant environment, the Apex runtime engine strictly enforces limits to ensure that runaway Apex code or processes don’t monopolize shared resources. If some Apex code exceeds a limit, the associated governor issues a runtime exception that cannot be handled.

The Apex limits, or governors, track and enforce the statistics outlined in the following tables and sections.

In addition to the core Apex governor limits, email limits and push notification limits are also included later in this topic for your convenience.

Per-Transaction Apex Limits

These limits count for each Apex transaction. For Batch Apex, these limits are reset for each execution of a batch of records in the execute method.

This table lists limits for synchronous Apex and asynchronous Apex (Batch Apex and future methods) when they’re different. Otherwise, this table lists only one limit that applies to both synchronous and asynchronous Apex.

Description	Synchronous Limit	Asynchronous Limit
Total number of SOQL queries issued1	100	200
Total number of records retrieved by SOQL queries	50,000
Total number of records retrieved by Database.getQueryLocator	10,000
Total number of SOSL queries issued	20
Total number of records retrieved by a single SOSL query	2,000
Total number of DML statements issued2	150
Total number of records processed as a result of DML statements, Approval.process, or database.emptyRecycleBin	10,000
Total stack depth for any Apex invocation that recursively fires triggers due to insert, update, or delete statements3	16
Total number of callouts (HTTP requests or Web services calls) in a transaction	100
Maximum cumulative timeout for all callouts (HTTP requests or Web services calls) in a transaction	120 seconds
Maximum number of methods with the future annotation allowed per Apex invocation	50
Maximum number of Apex jobs added to the queue withSystem.enqueueJob	50
Total number of sendEmailmethods allowed	10
Total heap size4	6 MB	12 MB
Maximum CPU time on the Salesforce servers5	10,000 milliseconds	60,000 milliseconds
Maximum execution time for each Apex transaction	10 minutes
Maximum number of push notification method calls allowed per Apex transaction	10
Maximum number of push notifications that can be sent in each push notification method call	2,000

1. In a SOQL query with parent-child relationship subqueries, each parent-child relationship counts as an extra query. These types of queries have a limit of three times the number for top-level queries. The limit for subqueries corresponds to the value thatLimits.getLimitAggregateQueries() returns.The row counts from these relationship queries contribute to the row counts of the overall code execution. This limit doesn’t apply to custom metadata types. In a single Apex transaction, custom metadata records can have unlimited SOQL queries. In addition to static SOQL statements, calls to the following methods count against the number of SOQL statements issued in a request.

Database.countQuery
Database.getQueryLocator
Database.query

2. Calls to the following methods count against the number of DML statements issued in a request.

Approval.process
Database.convertLead
Database.emptyRecycleBin
Database.rollback
Database.setSavePoint
delete and Database.delete
insert and Database.insert
merge and Database.merge
undelete and Database.undelete
update and Database.update
upsert and Database.upsert
EventBus.publish
System.runAs

3. Recursive Apex that does not fire any triggers with insert, update, or delete statements exists in a single invocation, with a single stack. Conversely, recursive Apex that fires a trigger spawns the trigger in a new Apex invocation, separate from the invocation of the code that caused it to fire. Because spawning a new invocation of Apex is a more expensive operation than a recursive call in a single invocation, there are tighter restrictions on the stack depth of these types of recursive calls.

4. Email services heap size is 36 MB.

5. CPU time is calculated for all executions on the Salesforce application servers occurring in one Apex transaction. CPU time is calculated for the executing Apex code, and for any processes that are called from this code, such as package code and workflows. CPU time is private for a transaction and is isolated from other transactions. Operations that don’t consume application server CPU time aren’t counted toward CPU time. For example, the portion of execution time spent in the database for DML, SOQL, and SOSL isn’t counted, nor is waiting time for Apex callouts.

Limits apply individually to each testMethod.
To determine the code execution limits for your code while it is 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. Or, you can use thegetLimitDMLStatements method to determine the total number of DML statements available to your code.

Per-Transaction Certified Managed Package Limits

Certified managed packages—managed packages that have passed the security review for AppExchange—get their own set of limits for most per-transaction limits. Certified managed packages are developed by Salesforce ISV Partners, are installed in your org from Salesforce AppExchange, and have unique namespaces.

Here is an example that illustrates the separate certified managed package limits for DML statements. If you install a certified managed package, all the Apex code in that package gets its own 150 DML statements. These DML statements are in addition to the 150 DML statements your org’s native code can execute. This limit increase means more than 150 DML statements can execute during a single transaction if code from the managed package and your native org both execute. Similarly, the certified managed package gets its own 100-SOQL-query limit for synchronous Apex, in addition to the org’s native code limit of 100 SOQL queries.

There’s no limit on the number of certified namespaces that can be invoked in a single transaction. However, the number of operations that can be performed in each namespace must not exceed the per-transaction limits. There’s also a limit on the cumulative number of operations that can be made across namespaces in a transaction. This cumulative limit is 11 times the per-namespace limit. For example, if the per-namespace limit for SOQL queries is 100, a single transaction can perform up to 1,100 SOQL queries. In this case, the cumulative limit is 11 times the per-namespace limit of 100. These queries can be performed across an unlimited number of namespaces, as long as any one namespace doesn’t have more than 100 queries. The cumulative limit doesn’t affect limits that are shared across all namespaces, such as the limit on maximum CPU time.

These cross-namespace limits apply only to namespaces in certified managed packages. Namespaces in packages that are not certified don’t have their own separate governor limits. The resources they use continue to count against the same governor limits used by your org’s custom code.

This table lists the cumulative cross-namespace limits.

Description	Cumulative Cross-Namespace Limit
Total number of SOQL queries issued	1,100
Total number of records retrieved by Database.getQueryLocator	110,000
Total number of SOSL queries issued	220
Total number of DML statements issued	1,650
Total number of callouts (HTTP requests or Web services calls) in a transaction	1,100
Total number of sendEmail methods allowed	110

All per-transaction limits count separately for certified managed packages except for:

The total heap size
The maximum CPU time
The maximum transaction execution time
The maximum number of unique namespaces

These limits count for the entire transaction, regardless of how many certified managed packages are running in the same transaction.

Also, if you install a package from AppExchange that isn’t created by a Salesforce ISV Partner and isn’t certified, the code from that package doesn’t have its own separate governor limits. Any resources it uses count against the total governor limits for your org. Cumulative resource messages and warning emails are also generated based on managed package namespaces.

For more information on Salesforce ISV Partner packages, see Salesforce Partner Programs.

Lightning Platform Apex Limits

The limits in this table aren’t specific to an Apex transaction and are enforced by the Lightning Platform.

Description	Limit
The maximum number of asynchronous Apex method executions (batch Apex, future methods, Queueable Apex, and scheduled Apex) per a 24-hour period1	250,000 or the number of user licenses in your org multiplied by 200, whichever is greater
Number of synchronous concurrent transactions for long-running transactions that last longer than 5 seconds for each org.2	10
Maximum number of Apex classes scheduled concurrently	100. In Developer Edition orgs the limit is 5.
Maximum number of batch Apex jobs in the Apex flex queue that are in Holding status	100
Maximum number of batch Apex jobs queued or active concurrently3	5
Maximum number of batch Apex job start method concurrent executions4	1
Maximum number of batch jobs that can be submitted in a running test	5
Maximum number of test classes that can be queued per 24-hour period (production orgs other than Developer Edition)5	The greater of 500 or 10 multiplied by the number of test classes in the org
Maximum number of test classes that can be queued per 24-hour period (sandbox and Developer Edition orgs)5	The greater of 500 or 20 multiplied by the number of test classes in the org
Maximum number of query cursors open concurrently per user6	50
Maximum number of query cursors open concurrently per user for the Batch Apex start method	15
Maximum number of query cursors open concurrently per user for the Batch Apex execute and finish methods	5

1. For Batch Apex, method executions include executions of thestart, execute, and finish methods. This limit is for your entire org and is shared with all asynchronous Apex: Batch Apex, Queueable Apex, scheduled Apex, and future methods. To check how many asynchronous Apex executions are available, make a request to the REST API limits resource. See List Organization Limits in the REST API Developer Guide. The licenses that count toward this limit are full Salesforce user licenses or App Subscription user licenses. Chatter Free, Chatter customer users, Customer Portal User, and partner portal User licenses aren’t included.

2. If more transactions are started while the 10 long-running transactions are still running, they’re denied.

3. When batch jobs are submitted, they’re held in the flex queue before the system queues them for processing.

4. Batch jobs that haven’t started yet remain in the queue until they’re started. If more than one job is running, this limit doesn’t cause any batch job to fail and execute methods of batch Apex jobs still run in parallel.

5. This limit applies to tests running asynchronously. This group of tests includes tests started through the Salesforce user interface including the Developer Console or by inserting ApexTestQueueItemobjects using SOAP API.

6. For example, if 50 cursors are open and a client application still logged in as the same user attempts to open a new one, the oldest of the 50 cursors is released. Cursor limits for different Lightning Platform features are tracked separately. For example, you can have 50 Apex query cursors, 15 cursors for the Batch Apex startmethod, 5 cursors each for the Batch Apex execute and finishmethods, and 5 Visualforce cursors open at the same time.

Static Apex Limits

Description	Limit
Default timeout of callouts (HTTP requests or Web services calls) in a transaction	10 seconds
Maximum size of callout request or response (HTTP request or Web services call)1	6 MB for synchronous Apex or 12 MB for asynchronous Apex
Maximum SOQL query run time before Salesforce cancels the transaction	120 seconds
Maximum number of class and trigger code units in a deployment of Apex	5,000
For loop list batch size	200
Maximum number of records returned for a Batch Apex query in Database.QueryLocator	50 million

1. The HTTP request and response sizes count towards the total heap size.

Size-Specific Apex Limits

Description	Limit
Maximum number of characters for a class	1 million
Maximum number of characters for a trigger	1 million
Maximum amount of code used by all Apex code in an org1	6 MB
Method size limit 2	65,535 bytecode instructions in compiled form

2. Large methods that exceeds the allowed limit cause an exception to be thrown during the execution of your code.

6. Miscellaneous Limits

Per Transaction Apex limits

Some of the important per transaction limits are:

Description	Synchronous Limit	Asynchronous Limit
Total number of SOQL queries issued	100	200
Total number of records retrieved by SOQL queries	50,000
Total number of SOSL queries issued	20
Total number of records retrieved by a single SOSL query	2,000
Total number of DML statements issued	150
Total number of records processed as a result of DML statements, Approval.process, or database.emptyRecycleBin	10,000
Total heap size	6 MB	12 MB
Maximum CPU time on the Salesforce servers	10,000 milliseconds	60,000 milliseconds
Maximum execution time for each Apex transaction	10 minutes