ora 54 resource busy

[hrishy]

Hi

I Have a program in C that drops a bitmap index and then rebuilds it.
Its a DW system wherein we drop the indexes load the data and recreate the bitmap indexes.

While dropping the bitmap index in the Pro C program sometimes i get that error ora 54 resource busy.I am thinking of trying the operation again all over till i suceed what do you guys think about this ?

code is something like

for dropping the index

do   {
      execute immeduate 'drop index ...';
      sleep(50);
}
while (sqlca.sqlcode!=54);

For creating the index

My C program calls a Pl/sql block and after creating the index when i try to set the degree of parallelism to 1 i run into ora 54 resource busy problem.So should i code similarly in the pl/sql block something like

loop {
       execute immeditae 'alter index xyz parallel 1';
       sleep(50);
       exit when sqlca.code!=54;
}
end loop;

is this the right approach ?

This code would be run through a scheduler .and would called through out the day by a lot of programs.

[slimdave]

How about a different approach, of setting the index unusable, "alter session set skip_unusable_indexes=true", load, then rebuild the indexes? I find it more robust myself, as changes to index properties (tablespace etc) do not have to be stored outside of the existing index definition.

Are you using direct-path loads, by the way? If so, have you evaluated loading with enabled indexes in place? If not, I would strongly advise that you use direct and not conventional-path inserts

[hrishy]

Hi

I am using sql based inserts and not a direct part insert.But its a bulk insert uisng Pro *C array features.

I did not understand about the skip unusable indexes=true.How do i do that ?

And also the ora 54 occurs when i am trying to set the parallel degree for the index not when i am rebuilding the index.

Do you mean something like

alter session set skip_unusable_indexes=true;
alter index myindex unusable;
alter index myindex rebuild;

regards
Hrishy

regards
Hrishy

[slimdave]

This sort of thing.

alter index myindex unusable;
alter session set skip_unusable_indexes=true;
>> load data here
alter index myindex rebuild;

How many rows do you insert in one load cycle?

[hrishy]

Hi Slim

You rock..thanks will modify my code i insert about 5000 rows..this is a parameter the user supplies..depends on that day.

regards
Hrishy