Apex 3.2 - Global Variables loosing value!

Hello Everyone,
I am using Oracle Apex version 3.2. I am using global variables in my queries.
I found that some times but not always these global variables loosing their
value. How I can resolve this issue?
All replies will be appreciated. Thanks in advance for your replies.
-Parveen

Hi, thanks for your answer.
The king of caché I was talking about is something like this:
* I get a table record (rowtype) from a query accesing the table by PK.
* I store the value of my PK and the record I got in PL/SQL and go back to the app.
* Then, if I need to get another record from my table accesing by PK I compare the PK value I got in memory:
- It is the same value: return the record (in this way I don't have to query my table).
- It isn't the same value: query the table with the new value and store the record and the PK value.
It is easy to do this in applications like Forms or .NET, but can I do it with APEX?
Thanks.
Johann Alexander Quintero
Cali, Colombia.

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==================================================
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