Salesforce provides a multitenant environment for running the Apex coding, so the runtime of Apex engine strictly enforces a number of limits for ensuring the runaway scripts and scripts don’t monopolize shared resources.
The Governors limits the track and enforce the statistics to be displayed in the below table.:
|Total number of SOQL's||20||100||100|
|Total number of SOQL's||0||20||20|
|Total number of records Retrieved by single SOQL Query||1000||10000||500|
|Total number of records Retrieved by single SOSL Query||0||200||200|
|Total Number Of Call out Methods||10||10||10|
|Total number of send email methods allowed||10||10||10|
|Total Heap Size 300000 Bytes 3MB||300000 Bytes||3 MB||1.5 MB|
the Governor limits can be enlarged from release to release.
And if scripts exceeds over limit then the associated governor issues a runtime exception that cannot be handled.
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