Cosmetic changes and minor refactoring

catalogue/oracle_catalogue_schema_header.sql

@@ -41,7 +41,3 @@ CREATE GLOBAL TEMPORARY TABLE TEMP_TAPE_FILE_INSERTION_BATCH(
 )
 ON COMMIT DELETE ROWS;
 CREATE INDEX TEMP_T_F_I_B_ARCHIVE_FILE_ID_I ON TEMP_TAPE_FILE_INSERTION_BATCH(ARCHIVE_FILE_ID);
-CREATE GLOBAL TEMPORARY TABLE TEMP_REMOVE_CASTOR_METADATA(
-  ARCHIVE_FILE_ID       UINT64TYPE
-)
-ON COMMIT DELETE ROWS;