Try tracking it down based on it and provide more details.
Reason for the alert
Typically, this alert occurs when you work with lists of data by way of List View, Summary View, and Obj-List rules. For example, a database query might be trying to retrieve the entire BLOB (pzPVStream).
To learn what the system was trying to process when this alert was triggered, search the Alert log by using the time stamp and the message ID number for the full text of the message, which includes a stack trace. Locate the rules that caused this much data to be read. Remediation can include one or more of the following actions (depending on your requirements):
Modify the report so that it retrieves only information from exposed columns, and does not need the BLOB column.
Add more criteria.
Limit the number of rows returned or reduce the number of data columns returned.