Recovery of space in OLAP 11.1.0.7

Hello
I tried to understand how the OLAP cube loads consume space and how can we free up space used by OLAP AW objects in DB version 11.1.0.7. I have the following questions.

1 during the loading process of a large number of data tablespace is apparently is used as TEMP, I note that the data space is consumed while a generation of cube is underway, but free in the tablespace space increases once the charging.
2. it is very difficult to reclaim the space used by an AW. I tried to remove the cubes, but it does not work. The only way I understood is to drop and re-create the full AW using the xmls. Is there a better way?
3 loads of incremental data sometimes take more space than the full loads. What is this means that old data is not deleted?

Thanks in advance.

One of the oddities of analytic workspaces is that a lot of versions or generations, can exist at the same time. It's very powerful, especially for the analysis of "what if?", but these generations take place. A special generation of AW will last as long as there is a customer in the appendix or if it is one of the last three generations. The following code can be used to eliminate some memory by forcing the creation of three new (small) generations. The AW in this case is GLOBAL, so you would need to adjust accordingly.

set serverout on size unlimited
GLOBAL > select round(sum(DBMS_LOB.GETLENGTH(AWLOB))/1024,0) kb from aw$global;

     KB
----------
    167699

GLOBAL > declare
2  aw_name varchar2(30);
3  begin
4   aw_name := 'GLOBAL';
5   dbms_aw.execute('aw attach ' || aw_name || ' rwx;define junkvar int;update;commit');
6   for i in 1..3 loop
7     dbms_aw.execute('aw reattach ' || aw_name || ' rwx;junkvar=junkvar+1;update;commit');
8   end loop;
9   dbms_aw.execute('delete junkvar;update;commit;aw detach ' || aw_name || '');
10 end;
11 /

PL/SQL procedure successfully completed.

GLOBAL > select round(sum(DBMS_LOB.GETLENGTH(AWLOB))/1024,0) kb from aw$global;

     KB
----------
    147019

Another useful trick is to call rebuild freepools. This is done automatically in 11.2, but you would need to do it yourself in 11.1.0.7.

alter table aw$global modify lob (awlob) (rebuild freepools);

Here's a quote from the Oracle documentation. Note that you should not run this if you use SECUREFICHIERS.

The REBUILD FREEPOOLS clause deletes all the old data from the LOB column. This clause is only useful if return you to PCTVERSION to LOB data management. You can do this to manage older data blocks.

Even after all this, there is always a table unadvoidable growth of $ AW. As a general rule, you can expect the table to increase three times its size after his original charge. It's mainly a side effect of the use of the LOBS to store the AW, given that LOB subsystem do not abandon the memory as soon as he got it.

2. it is very difficult to reclaim the space used by an AW. I tried to remove the cubes, but it does not work. The only way I understood is to drop and re-create the full AW using the xmls. Is there a better way?

This is a bug and has been discussed (and indeed discovered) in a recent thread: releasing storage occupied by Cube

3 loads of incremental data sometimes take more space than the full loads. What is this means that old data is not deleted?

Loads of additional data, or more precisely aggregations of inremental, take existing lists of the child nodes and extend them. This can lead to a similar to a fragmented hard disk fragmentation. After a full charge children lists will be stored together again. It is, either incidentally, why additional performance can degrade over time, and why a periodic complete aggregation can improve performance.

Tags: Business Intelligence

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