is a cache server must have knowledge on cached objects

Hi all:

I worked on this configuration:

1. a cache server, which is the instance of DefaultCacheServer consistency, with a certain configuration of twists and turns.
2. a charger, which reads a csv (or other source of data later) file and generate a list of items pofobject implemented and put them in a card and then put the card in the cache;
3. an auditor of reading, which is reading the NamedCache created previously and do some game: check the content, add filters, etc..

Now it works fine, but I noticed a few things:

-the server must have a pof-config file that contains the classes that implement the PortableObject, and as a result, these classes must be in the classpath of the server as well. If these conditions are not met, the charger will fail to load the objects into the cache.

What is a ligitimate observation? I mean, the server needs to know the objects it cached? It seems to me that couple deeply the server and applications that use the server.

In addition, I want to make objects more generic as possible. For example, if a client retrieves the result set from a SQL-based database, we are always trying to save the results cached somehow, even if we don't know about its internal information such as how that many columns or a column of names /types (maybe we can read this info from metadata?). However, we must know the properties of the object (name/type) to properly serialize / deserialize them before loading them in the cache.

So there is a conflict and how would be solve it?

Thank you
John

Johnny_hunter wrote:
Thank you, Rob. your answer was helpful.

Aruond my 2nd question, I don't know if it's feasible, but it is an interesting topic. Let me explain a little more.

If a user enters a SQL statement, he or she would have the knowledge of the structure of the returned resultset object - the necessary information in the SQL, they created in the first place. However, how can we put the results set returned in the cache for later use? It is difficult, because the SQL code is arbitrary so the key is not clear and the result set is difficult to serialize.

Even we can fill the cache with all the d-base tables, the SQL consistency is not semantically as powerful as real SQL for all tasks.

On the other hand, if the user calls a store proc, we get lucky: Ms name is set, the parameters are editable, but put in shape. Once combined, we can use it as the name of a namedcache. For example, if we have a PC called sp_get_trades, and it takes a standing business as the param, we can create a name such as "sp_get_trade_2011_07_11". From the returned result set, we can obtain its metadata, which contains the column names and types, armed of a JAVA reflection API, we might be able to create a list of mobile objects.

Hi John,.

the result set can be serialized into a single object (no matter whether serialized with POF or not).

This unique object can then be cached with an appropriate key. Typical approaches to the formation of such a key creates a composite key that contains the SQL query AND all the SQL parameter values in the order in which they are passed to the class PreparedStatement. Of course the key class must properly implement equals, hashcode, and must also be serializable with the same method (Java or POF Serialization) that is used for the cache service.

Of course sooner or later, you can invalidate this cache entry, so you can specify a lifetime in putting the result in the cache.

In addition, you can explicitly invalidate the cache on changes in DB entry, create an index on the SQL attribute in the key or a composite index on the SQL attribute and some settings or just an index on one or more parameters together, to allow you to send an input processor filtered by these indexed attributes, and given the knowledge about what has changed in the database.

Best regards

Robert

Tags: Fusion Middleware

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                               AND UPPER (a.sql_text) LIKE
                                                        '%' || p_object || '%'
                               AND c.ID = 0
                          ORDER BY 2 DESC)
                   WHERE ROWNUM <= 50;   --profile option
BEGIN

skount := 0;
dkount := 0;

 FOR i IN objects
      LOOP
         FOR j IN apis (i.object_name)
         LOOP
            skount := skount + 1;
            plsbatch(skount).cxs_object_name  := i.object_name;
   plsbatch(skount).cxs_object_type      :=  i.object_type;
   plsbatch(skount).cxs_object_status    :=  i.object_status;
   plsbatch(skount).cxs_read_execution   := j.reads_per_execution;
   plsbatch(skount).cxs_buffer_gets      := j.buffer_gets;
   plsbatch(skount).cxs_disk_reads       := j.disk_reads;
   plsbatch(skount).cxs_executions       := j.executions;
   plsbatch(skount).cxs_sorts            := j.sorts;
   plsbatch(skount).cxs_sharable_mem     := j.sharable_mem;
   plsbatch(skount).cxs_address          := j.address;
   plsbatch(skount).cxs_hashvalue        := j.hashvalue;
   plsbatch(skount).cxs_osuser           := j.osuser;
   plsbatch(skount).cxs_username         := j.username;
   plsbatch(skount).cxs_module           := j.module;
   plsbatch(skount).cxs_machine          := j.machine;
   plsbatch(skount).cxs_status           := j.status;
   plsbatch(skount).cxs_terminal         := j.terminal;
   plsbatch(skount).cxs_percentconsume   := j.percentconsume;
   plsbatch(skount).cxs_percentrepeat    := j.percentrepeat;
   plsbatch(skount).cxs_plan             := j.explainplan;
         END LOOP;

         FOR dd IN dpend (i.object_name)
         LOOP
            dkount := dkount + 1;
            dependrec (dkount).target_name := dd.NAME;
            dependrec (dkount).refname := dd.referenced_name;
            dependrec (dkount).reftype := dd.referenced_type;
            dependrec (dkount).target_owner := dd.owner;
            dependrec (dkount).refowner := dd.referenced_owner;
         END LOOP;
      END LOOP;

for a in 1..skount loop

   out_rec.cxs_object_type      := plsbatch(a).object_type;
   out_rec.cxs_object_status    := plsbatch(a).object_status;
   out_rec.cxs_read_execution   := plsbatch(a).reads_per_execution;
   out_rec.cxs_buffer_gets      := plsbatch(a).buffer_gets;
   out_rec.cxs_disk_reads       := plsbatch(a).disk_reads;
   out_rec.cxs_executions       := plsbatch(a).executions;
   out_rec.cxs_sorts            := plsbatch(a).sorts;
   out_rec.cxs_sharable_mem     := plsbatch(a).sharable_mem;
   out_rec.cxs_address          := plsbatch(a).address;
   out_rec.cxs_hashvalue        := plsbatch(a).hashvalue;
   out_rec.cxs_osuser           := plsbatch(a).osuser;
   out_rec.cxs_username         := plsbatch(a).username;
   out_rec.cxs_module           := plsbatch(a).module;
   out_rec.cxs_machine          := plsbatch(a).machine;
   out_rec.cxs_status           := plsbatch(a).status;
   out_rec.cxs_terminal         := plsbatch(a).terminal;
   out_rec.cxs_percentconsume   := plsbatch(a).percentconsume;
   out_rec.cxs_percentrepeat    := plsbatch(a).percentrepeat;
   out_rec.cxs_plan             := plsbatch(a).explainplan;
   PIPE ROW(out_rec);
end loop;


for b in 1..dkount loop
    out_rec.target_name := dd.NAME;
            out_rec.refname := dependrec (b).referenced_name;
            out_rec.reftype := dependrec (b).referenced_type;
            out_rec.target_owner := dependrec (b).owner;
            out_rec.refowner := dependrec (b).referenced_owner;
            PIPE ROW(out_rec);
 end loop;
RETURN;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.format_error_backtrace);
DBMS_OUTPUT.PUT_LINE(SQLCODE);
DBMS_OUTPUT.PUT_LINE(SQLERRM);
END;
    and here's tradtional types of tables that are used in the code above.
     TYPE type_plsql_rec IS RECORD (
   cxs_object_name      VARCHAR2 (128),
   cxs_object_type      VARCHAR2 (19),
   cxs_object_status    VARCHAR2 (7),
   cxs_read_execution   NUMBER,
   cxs_buffer_gets      NUMBER,
   cxs_disk_reads       NUMBER,
   cxs_executions       NUMBER,
   cxs_sorts            NUMBER,
   cxs_sharable_mem     NUMBER,
   cxs_address          NUMBER,
   cxs_hashvalue        NUMBER,
   cxs_osuser           VARCHAR2 (30),
   cxs_username         VARCHAR2 (30),
   cxs_module           VARCHAR2 (48),
   cxs_machine          VARCHAR2 (64),
   cxs_status           VARCHAR2 (8),
   cxs_terminal         VARCHAR2 (16),
   cxs_percentconsume   NUMBER,
   cxs_percentrepeat    NUMBER,
   cxs_plan             VARCHAR2 (120)
   );

   TYPE plsql_batch IS TABLE OF type_plsql_rec
      INDEX BY BINARY_INTEGER;
      
      
       TYPE type_depend_tab IS RECORD (
      target_name    dba_dependencies.NAME%TYPE,
      refname        dba_dependencies.referenced_name%TYPE,
      reftype        dba_dependencies.referenced_type%TYPE,
      target_owner   dba_dependencies.owner%TYPE,
      refowner       dba_dependencies.referenced_owner%TYPE
   );

   TYPE depend_tab IS TABLE OF type_depend_tab
      INDEX BY BINARY_INTEGER;
    Thank you for your time in reading this post

    R

    Johan says:
    Sorry!.
    Actually, I meant

    I thought as well.

    Typos can be expensive however. As a probe of NASA Mars in 99, which was lost due to a simple mathematical error - a confusion between English and metric units. ;-)

    Or screw up a server in reason to use a Unix fork() where the client process think that it is the parent and the beginning more children who believe they are also parents of spawning... (one of my mistakes of kewlest never) :-)

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