Governor Limits

 What is governor limits?           

    Governor limit is the permitted resource usage per transaction in force.com. This is enforced and governed by Salesforce to stop misuse of common resources.

Specification Details:

There are 2 modes Synchronous & Asynchronous.

Synchronous: Executed in real time and the calling process waits for the process to complete

Asynchronous: Executed in a separate thread and only when the resources are available. Calling process doesn't wait for the completion of the process.

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	0 in batch and future contexts; 1 in queueable context
Maximum number of Apex jobs added to the queue withSystem.enqueueJob	50	1
Total number of sendEmail methods 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
Maximum number of EventBus.publish calls for platform events configured to publish immediately	150