PL/SQL: Cursor with list filling can do IF EXISTS on Table

Here's my problem. The DB I work with is a database of events (network events). I have a task to take a list of nodes of 2600 and see whether these nodes exist in a set of events that would be with a certain WHERE clause. On my first pass, I did WHERE AND NŒUD clause in (list of 2600 nodes). Well you can put only 1,000 items in a list so I've divided into 3 reports and served while a UNION all between them. This used 15% of the resources of the db and ran for hours and the Group dba like me to find a better way. They would prefer that I use PL/SQL.

I am new to pl/sql (but not programming or SQL). So the first thing I've done is just figure out how to get my list in a Varray, which I then went to a table because I couldn't find examples, after hours and hours of searching the Web,.
referencing a Varray with SQL syntax.

START CODE sample 1 *.
DECLARE
DECLARE
TYPE NodeList IS TABLE OF VARCHAR2 (255);
Node NodeList: = NodeList ('node1', node2', [.. .list of 2597 nodes..], 'node2600')

BEGIN
dbms_output. Enable (1000000);
FOR i IN Nodes.FIRST... Nodes.LAST
LOOP
DBMS_OUTPUT. Put_line (' relevant points: ' |) Nodes (i));
END LOOP;
END
END CODE Sample 1 *.

The pseudo-code I'm envisioning goes something like this:

IF one of these nodes (nodes of 2600 list),
There are in the nodes for this WHERE clause (which is taken from the event db table).
then print the records (of the events in the event db table) that contains the nodes (ie the list nodes).

I think I found an example with 2 sliders, but I can't find this example once again. And anyway, I can't figure out how to get my list in a cursor. I have many examples of how to complete a cursor on a select statement against a database.

I tried this but it did not work:
START the CODE sample 2 *.
DECLARE
DECLARE
TYPE NodeList IS TABLE OF VARCHAR2 (255);
Node NodeList: = NodeList ('node1', node2', [.. .list of 2597 nodes..], 'node2600')

CURSOR MOM_OVO_NODES IS
SELECT the node
OF NodeList
ORDER BY node;

BEGIN
dbms_output. Enable (1000000);

FOR nodelist_rec IN MOM_OVO_NODES
LOOP
dbms_output.put_line (' relevant nodes: ' | nodelist_rec.) Node);
END LOOP;

END
END CODE sample 2 *.

Is there a way to get this list in a slider? Or I think about this correctly?

Brad

Brad Bueche wrote:
Here's my problem. The DB I work with is a database of events (network events). I have a task to take a list of nodes of 2600 and see whether these nodes exist in a set of events that would be with a certain WHERE clause. On my first pass, I did WHERE AND NŒUD clause in (list of 2600 nodes). Well you can put only 1,000 items in a list so I've divided into 3 reports and served while a UNION all between them. This used 15% of the resources of the db and ran for hours and the Group dba like me to find a better way. They would prefer that I use PL/SQL.

PL/SQL is probably going to be a slower solution, then SQL. It's almost always.

Your best bet would be to maintain a table of nodes. You can then use a single SQL query with an IN WHERE clause as:

WHERE node in (SELECT node FROM node_table)

Or you can use a join (the method preferred honestly, gives Oracle more optimization options).

If you don't want to maintain a table of node, you can always create a global temporary Table or the external Table that could be loaded prior to running your report.

If you have tried these methods, and it is still too low or high intensity of resources, then we should look at the SQL and chorus only. See the PL/SQL FAQ's for more information on setting the SQL statements.

Tags: Database

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