Hello
You can shrink the 3 datafiles to 10G .
ALTER DATABASE TEMPFILE '/oracle/QAT/temp.data2' resize 10G;
ALTER DATABASE TEMPFILE '/oracle/QAT/temp.data3' resize 10G;
ALTER DATABASE TEMPFILE '/oracle/QAT/temp.data4' resize 10G;
If you are on version 11g you can also do it using
alter tablespace PSAPTEMP shrink space keep 30G;
If you are planning to perform compression, tempfile should be big enough.
1109743 - Use of Index Key Compression for Oracle Databases
Please make sure that your PSAPTEMP Temporary Tablespace is at least as big as the biggest index to rebuild
Regards
