In V5R4, the internal representation of SQL statements has been changed to support statements up to 2 097 152 bytes in length.
The first time these objects are referenced after an upgrade
to the new release, the internal representation of SQL statements in programs,
service programs, Distributed Relational
Database Architecture™ (DRDA®) packages, and extended dynamic packages that were
created before V5R4 is converted automatically to the new format. This conversion
should not significantly affect the time to install the release, but could
be noticed after the installation is complete and objects that contain SQL
statements are referenced for the first time. To control when these object
conversions are performed, use the Start Object Conversion (STROBJCVN) command
after you upgrade. For further information, see Informational APAR II14080
on the Support for iSeries Family 
Web site (www.ibm.com/servers/eserver/support/iseries/).
In the navigation bar, click Technical databases; then
click Authorized Problem Analysis Reports APARs.