how to find out Schedulable class is already scheduled or not?

To find out if a given class is scheduled use an SOQL query like:

SELECT Id, CreatedById, CreatedDate, Status, CompletedDate
    FROM AsyncApexJob
    WHERE ApexClass.NamespacePrefix = :namespace
            AND ApexClass.Name = :className

Where namespace is your namespace (leave out if you are not in a package) and className is the class name string, such as "MyExampleSchedulable".

Tags:

Soql

Scheduled Apex

Scheduled Job

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