Description:
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In a multiple web server environment with identical php code/setup on each web server, there are multiple established connections between web server processes (not threads) and the db2 server.  However, on each of the web servers, only one of those connections is actually doing work.

Changing the connection type from pconnect to connect allows all web server process established connections actually work in parallel.

Environment is:

AIX power 7 LPARS with OS AIX 7.1 Tech level 1 service pack 2
web servers:
apache 2.2.21 - 32 bit compiled
php 5.3.10 - 32 bit compiled
ibm_db2 php extention 1.9.2 - 32 bit compiled
ibm db2 9.7.0.x run time client (some have ga base, some have fix pack 5, some have fix pack 5 with special fix)
db2 servers:
ibm db2 enterprise server edition 9.7.0.5 (some with special fix)