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Suma KasapuramSuma Kasapuram 

In the Apex flex queue, the executeBatch start calls are not getting logged.

Gopikrishna AavulaGopikrishna Aavula
Did you receive any error like limit reached 100. As per limitation, flex queue holds 100 records maximum at any point of time.
Gopikrishna AavulaGopikrishna Aavula
Also check if your organisation installed the critical updates from salesforce about flex queue
Niket SFNiket SF
- What is your org version ? in Spring ’15, Apex Flex Queue is enabled by default.
- If not to activate the Apex Flex Queue critical update in Setup.
- Fire SOQL  to check if job is in Holding status on AsyncApexJob.
 
Suma KasapuramSuma Kasapuram
Yes, the jobs are in Holding status 
Niket SFNiket SF
The system can process up to five queued or active jobs simultaneously. The status of these moved jobs changes from Holding to Queued. Queued jobs get executed when the system is ready to process new jobs.

May be you can try to delete some of the active jobs ?