Use memory slider in a background task

I'm doing research on a solution for a customer and need assistance because I am admittedly a novice of the Oracle. They run 10g Enterprise Edition.

{color: Navy} * problem * {color}: create a background process of low priority that uses DB idle windows to read a large table (over 25 million records) running at the same time and perform some simple operations with a few fields of each line. The process should run 24 x 7 by default, although capable of being administratively pause / restart at any time. It must also suspend M hours after the last read line and restart after a following hours of N.

H3.
Oracle jobs
First of all, I wonder if it looks like a task for a "job" managed by the Scheduler (< tt > < /tt > DBMS_SCHEDULER), which can be enabled or disabled to mimic features pause/restart.

H3.
Cursors and memory usage
My second main question lies with the memory usage. One of their major concerns is that the background process are not a lot of memory on the server. The general flow, I worked upwards:
< Li > function1: declare and open a cursor for the primary SELECTION. This must be run only once. Call function2.
< Li > function2: the second function main would perform an extraction of a line of the cursor and make a call to an auxiliary function to act on the data. Function2 will run constantly as the main process.
< Li > Function3: close the cursor. Would be executed at the last line of the table, or if for any reason any admin. decide to interrupt the process prematurely.
< Li > if the customer decides this, this process can be constant, then it would be restarted automatically with a call to function1.

However, I do not understand sliders enough to know if who care a lot of memory on the server throughout the life cycle of the master process, knowing in advance that identifies the cursor result set is very large. I tried to search for this time in these forums and manuals (the administrator of the DB, SQL Reference, Guide to the application developer), but not able to find a clear answer - I got lost somewhere between PGA and SGA memory. The furthest I've gotten in the agree sliders is that they are a set of simple instructions, not a copy of the resultset object and therefore occupy a significant amount of memory resident. I would appreciate a check on the question of whether this is true or not.

I'm wide open to suggestions - thanks in advance for the help!

CrackerJackhammer wrote:
Of course, I was referring to an explicit cursor when I asked about disabling coherent reading. I am very doubtful that it is a good idea, not more.

Unless the life of the cursor is a relatively short period of time allowing a coherent reading efficiently maintained.

Dealing with large volumes of data do not deny the use of cursors (such as indicating in substance that SQLs must not be used on large data sets). And is not a true statement.

Simpler examples, a select on a large table count is also a read uniform. How long does take a few billion lines? It can be as fast as [seconds | http://forums.oracle.com/forums/thread.jspa?messageID=3638946#3635598].

So there are ways to deal with large sets of data in Oracle fast enough. And there are quite a few weapons in the arsenal to deal with large volumes of data. Partitioning is a. Parallel processing is another.

You must also decide where you're going "+ pay + ' for this treatment. You can pay in small quantities at the front – by a trigger that makes ' + Act + "during the validation of these data. Or basically pay lump sums by ' + Act + ' via a background task that hits all the lines that are not covered in the table with parallel query and DML for example.

Another challenge I have with this client, is that since they are a large company and in fact have their own team of development, requirements come from different members of this team. According to who wrote them, they are better or worse described and often good housekeeping in the technical requirements detailed framing a boxed solution. Expect management to review these requirements and weed out them out we should be able to offer us... go figure.

Yes... It is always a problem when it comes to multiple parties - determine the real needs, separating the nice-to-have the agent.

I threw the "explicit big momma cursor that does everything ;) "possibility, because it has far too many questions. Instead, we offer the customer that add us a column to the debts_table following the processing status, 0 or 1. 0 if it has not been processed yet, or errors occur in the transformation and 1 once it is successfully treated. 0 is the default value for all existing records and adding of new debt. In this way, all I have to do is select a line at a time, perhaps by order of date more than the debt, and if his status is 0 then treat. If successful, update the State 1. Flow would go back to the select statement, who would choose the next row with status = 0 and so on.

This can work. You can also break down work in units of work using additional predicates from the client area and date, disc physical range lines. With unit of work, you have a pieces of treatment easier to manage to run - and these can be run in parallel, run of offbeat way or same anti-theft.

Tags: Database

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