As you ma be aware that 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.
Some of the common governor limits are
| Total number of SOQL queries issued | 100 |
| Total number of records retrieved by SOQL queries | 50,000 |
| Total number of SOSL queries issued | 20 |
| Total number of DML statements issued | 150 |
| Total number of sendEmail methods allowed | 10 |
Limits Class
Contains methods that return limit information for specific resources.
Example:
System.debug(‘Total Number of SOQL Queries allowed in this apex code context: ‘ + Limits.getLimitQueries());
System.debug(‘Total Number of records that can be queried in this apex code context: ‘ + Limits.getLimitDmlRows());
System.debug(‘Total Number of DML statements allowed in this apex code context: ‘ + Limits.getLimitDmlStatements() );
System.debug(‘Total Number of script statements allowed in this apex code context: ‘ + Limits.getLimitScriptStatements());
System.debug(‘Total Number of SOQL Queries allowed in this apex code context: ‘ + Limits.getLimitQueries());
System.debug(‘Total Number of records that can be queried in this apex code context: ‘ + Limits.getLimitDmlRows());
System.debug(‘Total Number of DML statements allowed in this apex code context: ‘ + Limits.getLimitDmlStatements() );
System.debug(‘Total Number of script statements allowed in this apex code context: ‘ + Limits.getLimitScriptStatements());