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Process to extract a value from BLOB to a column is slow



The process to extract a value from BLOB to a column is slow. The table count is 4.7 million and the process does not even run 1000 rows/hr.

Error Messages

Not Applicable.

Steps to Reproduce

Run the shell script.

Root Cause

The amount of data extracted is around 4.7 million records and the process is running on a single thread.


Perform the following local-change:
  1. Navigate to
  2. Set the 'expose.numOfThreads' property value to a higher value in case of updating large sets of data 


Published July 23, 2018 - Updated October 8, 2020

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