Peacekeeping contexts ODCI sweep between sessions

Hello

I have a problem when implementing the interface for function ODCI pipeline in Java using 11.1.0.7. I have copy and paste the example code [url http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28425/pipelined_example.htm#CHDHDHEE] from the documents, only adding an ODCITablePrepare function to take advantage of the knowledge of the columns that are covered by the request. Everything works fine the first time I run my function as you can see from the trace
SQL>exec insert_ab10_cat;
Entering ODCITablePrepare
setContext key=0
create hashtable
setContext new key=1
Created context with key = 0
Marking fields accessed by query: 3 - 13 - 14 - 15 ...
Leaving ODCITablePrepare with context = DWH.PARSEFILECAT

Entering ODCITableStart with context = DWH.PARSEFILECAT
Retrieving context with key = 0
getContext key=0 count=1
Calling list_files() with sysName = AB10, fileType = CAT
Leaving ODCITableStart

Entering ODCITableFetch with nrows = 1
Retrieving context with key = 0
getContext key=0 count=1
Opening file /mnt/cluster/xxxxxxxxx
Leaving ODCITableFetch with nrows = 276

Entering ODCITableFetch with nrows = 32766
Retrieving context with key = 0
getContext key=0 count=1
Leaving ODCITableFetch with nrows = 0

Entering ODCITableClose
Retrieving context with key = 0
getContext key=0 count=1
Leaving ODCITableClose

PL/SQL procedure successfully completed.
Also, things are ok, if I run the function again in the same session, given that I have does not clear the previous context. This time Oracle does not call ODCITablePrepare because the SQL query is stored in the shared area:
SQL>exec insert_ab10_cat;
Entering ODCITableStart with context = DWH.PARSEFILECAT
Retrieving context with key = 0
getContext key=0 count=1
Calling list_files() with sysName = AB10, fileType = CAT
Leaving ODCITableStart

Entering ODCITableFetch with nrows = 1
Retrieving context with key = 0
getContext key=0 count=1
Opening file /mnt/cluster/......
Leaving ODCITableFetch with nrows = 250

Entering ODCITableFetch with nrows = 32766
Retrieving context with key = 0
getContext key=0 count=1
Leaving ODCITableFetch with nrows = 0

Entering ODCITableClose
Retrieving context with key = 0
getContext key=0 count=1
Leaving ODCITableClose

PL/SQL procedure successfully completed.
But things go wrong if I connect and once again, or if I try a new session:
SQL>exec insert_ab10_cat;
Entering ODCITableStart with context = DWH.PARSEFILECAT
Retrieving context with key = 0
getContext key=0 count=0
Exception in thread "Root Thread" java.lang.NullPointerException
        at oracle.CartridgeServices.ContextManager.getContext(ContextManager.java:48)
        at myClass.ODCIstart(ParseFile.java:144)
        at myClass.ODCITableStart(ParseFileCAT.java:97)
BEGIN insert_ab10_cat; END;

*
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception: java.lang.NullPointerException
Note that the accident occurred inside the ContextManager Oracle class... Hmm... Of course, everything go back to normal if I drain the shared pool. The behavior (except of course for the part of crash) is somewhat understandable, given that different sessions are not supposed to share memory, so the context that was originally created by ODCITablePrepare is not available to the other sessions, even if the index of the object that is stored by the ContextManager CartigeServices is an attribute of the object type (in this case DWH.) PARSEFILECAT) and is shared by all sessions.

So what is the solution to this situation? I have the feeling that the right way to do would be to define and store all the objects that should be passed between sessions as attributes of the object type, instead of a pointer to integer unique to a ContextManager entry; However, the Java object representing the context is quite complex and I have no idea how to represent in PL/SQL, this coding by hand would be very difficult and prone to error, still less a maintenance nightmare. Does anyone know of a better way to do it?

Thanks for your help,
Chris

Hi Chris:
There is an inconsistency here between the docs and reality :(
Note This article (http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10765/pipe_paral_tbl.htm#ADDCI4712):
>
Prepare, method

ODCITablePrepare() is called during query compilation. It generates and saves the information to reduce the runtime of the query.

If you do implement a ODCITablePrepare(), ODCITableStart() initializes the context whenever it is called. However, if you do not implement ODCITablePrepare(), it initializes the context of analysis, which is passed to the ODCITableStart () when the query is run, by reducing the startup time. In addition, when ODCITablePrepare() is implemented, ODCITableClose() is called only once during the query, rather than every time the table service is restarted. This offers the following advantages:

It reduces the execution time by reducing the number of calls to ODCITableClose().

It allows the context of scanning between the table function restarts.

ODCITablePrepare() also provides information of projection to the table function. If you do not ODCITablePrepare() implement for the table of functions that return collections of types defined by the user (UDT), your table function must define all the attributes of the UDT of each element, because there is no way to know which attributes are used. On the other hand, selection in an ordinary table retrieves only the required columns, which is naturally faster in most cases. However, if you do not implement ODCITablePrepare(), it can build a table of positions of the attribute, record the return type information in an argument of type ODCITabFuncInfo and save this information in the analysis, as described in example 13-14. >
But I'm sure that if you close a connection to the DB, the OJVM fade and all information stored in a hash table will disappear (remember that ContextManager.setContext (ctx); in-house is implemented by a hash table).
My recommendation is:
-Try to implement most of part of the pipeline in PLSQL, switch to Java implies a change in SQL in the Java context space. For example, you can implement Prepare and describe the method in PLSQL and only implemt start/extraction/close in Java.
-If you can not retrieve information from struct in another parallel to the Java session, try to use a temporary with instance field table and stores rated context, you can use the args as the key value, this value is passed into all the functions describe, prepare, start, is therefore a good candidate to work as a key and the temporary table will work as a shared memory area stored in the LMS.
Best regards, Marcelo.

Tags: Database

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