Please follow below steps.
NOTE: Here primary & standby already configuared. The below are the steps we are performing on standby database, to make it active standby database.
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1. Connect to the standby database.
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2. Stop redo apply using the below script
SQL>recover managed standby database cancel;
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3. Issue the following query to find out if the standby database is performing Redo Apply or real-time apply. If the MRP0 or MRP process exists, then the standby database is applying redo
SQL> SELECT PROCESS, STATUS FROM V$MANAGED_STANDBY;
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4. Check database tole, open mode using the below script. 
SQL>select name, database_role,open_mode from v$database;
NAME      DATABASE_ROLE        OPEN_MODE
---------     ------------------------------   ------------------
TESTP     PHYSICAL STANDBY      MOUNTED  
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5. Now open the database in OPEN READ ONLY mode. Use below SQL
SQL> Alter database open read only;
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6. Check database tole, open mode using the below script. 
SQL>select name, database_role,open_mode from v$database;
NAME      DATABASE_ROLE       OPEN_MODE
---------     ------------------------------   ------------------
TESTP    PHYSICAL STANDBY     READ ONLY
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7. start redo apply using below SQL on standby database.
SQL>alter database recover managed standby database using current logfile disconnect;
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8. Check database tole, open mode using the below script. 
SQL>select name, database_role,open_mode from v$database;
NAME      DATABASE_ROLE       OPEN_MODE
----------    -----------------------------    -----------------------------------
TESTP    PHYSICAL STANDBY     READ ONLY WITH APPLY
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NOTE:
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Start Redo Apply or Real-Time Apply:
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- To start Redo Apply, issue the following statement: - 
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
- To start real-time apply, issue the following statement: - 
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
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