Hi Experts,
I saw the following behavior while trying to debug an out-of-memory issue, and hence wanted some inputs form experts.
1. Create a table as " create table ISSUEDEBUG like "SCHEMAXYZ"."COBK" "
2. insert into "EPANTRA"."ISSUEDEBUG" (select * from "LND_F08CLNT400_R"."COBK" )
Size of table COBK : 17GB
3.Size of table ISSUEDEBUG during the insert operation>> 44GB+
So, it seems some temporary table is getting generated during insert operation and its size is considerably larger than source table size.
4. Select count(*) query returns 0 count
Questions:
1. The size of temporary table goes way higher than source table size (even much higher than source system table size too).Why?
(Is delta memory/uncompression the reason or there is something more to it, as the size on source system is also 20GB)!!
3. This issue becomes critical for implementation if a Data Services job is trying to do this activity(moving data from a base to higher schema) with some transformation?
Regards,
Rahul