Governer Limits

What is Governer Limit , Why this term even exist in Salesforce ?

As you must be aware salesforce is a could service provider hosting so many applications, having millions of partners and customer who interact with this cloud on daily basis.

So to avoid monopoly of a single individual/organisation and establishing the equality in terms of bandwitdh to access the shared resource governor limits are in place with salesforce.

Governor limits are classified on two measures 

1. Synchronous Interaction with servers.

2. Asynchronous Interaction with servers.

Types of Governer Limit

Per-Transaction Apex Limits

Category		Synchronous	Asynchronous
SOQL Limits	Total number of SOQL queries issued	100	200
	Total number of records retrieved by SOQL queries	50000
	Total number of records retrieved by Database.getQueryLocator	10000
SOSL Limits	Total number of SOSL queries issued	20
	Total number of records retrieved by a single SOSL query	2000
DML	Total number of DML statements issued	150
	Total number of records processed as a result of DML statements, Approval.process, or database.emptyRecycleBin	10000
Invoking New Apex through Triggers invocation from a running Apex	Total stack depth for any Apex invocation that recursively fires triggers due to insert, update, or delete statements	16
Callouts and Webservice	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
Future Methods	Maximum number of methods with the future annotation allowed per Apex invocation	50	0 in batch and future contexts; 1 in queueable contex
Queueble Apex	Maximum number of Apex jobs added to the queue with System.enqueueJob	50	1
Email	Total number of sendEmail methods allowed	10
Heap Size	Total heap size	6 MB	12 MB
CPU Exception Limit	Maximum CPU time on the Salesforce servers	10 second	60 seconds
APEX	Maximum execution time for each Apex transaction	10 minutes
Push Notifications	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	2000

Lightning Platform Apex Limits

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

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
Apex trigger batch size2	200
For loop list batch size	200
Maximum number of records returned for a Batch Apex query in Database.QueryLocator	50 million

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 org	6 MB
Method size limit	65,535 bytecode instructions in compiled form

Push Notification Limits

Mobile application type	Maximum notifications per app per day
Provided by Salesforce (for example, Salesforce for iOS)	50,000
Developed by your company for internal employee use	35,000
Installed from the AppExchange	5,000