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PEGA0039 alert: BLOB size read from the database exceeded threshold

The PEGA0039 alert occurs when a database query retrieves a BLOB column (pzPVStream property value, also called the Storage Stream) that is larger (in bytes) than the threshold value. The alert provides a warning that memory performance of your system might be affected when the Pega 7 Platform expands the BLOB onto a clipboard page.

In contrast to the PEGA0039 alert, the PEGA0004 alert indicates the size of the entire result set of a query (that might or might not include BLOBs) if the individual row is greater than a threshold.

Example message text

The alert identifies the pzInsKey that was read, and the size in bytes of the BLOB:

Read blob from database with compressed size 2058486 expanded size 4125916. pzInsKey: RULE-FILE-BINARY WEBWB OPENAUTHORING!CAB #20100304T152007.144 GMT

Default prconfig.xml settings

<env name = “alerts/database/blobsizeread/enabled" value="true" />

The enabled value is Boolean. To turn off the alert, set the value to "false",

<env name = “alerts/database/blobsizeread/threshold" value="3" />

The threshold value is a positive integer in megabytes (the default is 3). This value is checked against the compressed size of the BLOB being read.

Stop and restart the server after changing these settings.

Reason for the alert

Examine the record being read (identified by the pzInsKey value and determine whether the entire BLOB is needed. Usually, you can divide the data into additional logical segments (as required by your application).

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