Jayesh Pande

 Changing DB NAME in 19C & 21C [oracle@localhost ~]$ nid DBNEWID: Release 19.0.0.0.0 - Production on Thu Dec 23 00:05:36 2021 Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved. Keyword     Description                    (Default) ---------------------------------------------------- TARGET      Username/Password              (NONE) DBNAME      New database name              (NONE) LOGFILE     Output Log                     (NONE) REVERT      Revert failed change           NO SETNAME     Set a new database name only   NO APPEND      Append to output log           NO HELP        Display...

 [oracle@localhost ~]$ nid DBNEWID: Release 19.0.0.0.0 - Production on Thu Dec 23 00:05:36 2021 Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved. Keyword     Description                    (Default) ---------------------------------------------------- TARGET      Username/Password              (NONE) DBNAME      New database name              (NONE) LOGFILE     Output Log                     (NONE) REVERT      Revert failed change           NO SETNAME     Set a new database name only   NO APPEND      Append to output log           NO HELP        Displays these messages    ...

Optimizer Approaches ALL_ROWS :-  The ALL_ROWS hint explicitly chooses the cost-based approach to optimize a statement block with a goal of best throughput (that is, minimum total resource consumption). /*+ ALL_ROWS */ SELECT /*+ ALL_ROWS */ table_name FROM dba_tables WHERE owner = 'SYS' AND table_name LIKE '%$' ORDER BY 1; ------------------------------------------------------------------------------------------------------------------------------------------------------- FIRST_ROWS(n) The FIRST_ROWS hint explicitly chooses the cost-based approach to optimize a statement block with a goal of best response time (minimum resource usage to return first row). This hint causes the optimizer to make these choices: If an index scan is available, the optimizer may choose it over a full table scan. If an index scan is available, the optimizer may choose a nested loops join over a sort-merge join whenever the associated table is the potential ...