Switchover tnsnames client

Question

I have created primary and standby database, and both are working perfectly fine, when I performed switchover, I am having one issue.
The client users can not access the database The reason they have only one primary database entry in tnsnames.ora file, when I added one entry for standby in one users tnsnames file, the user can access the database sucessfully.
primary------ machine: test9 sid: primary
standby------machine: standby sid: standby
What should we do ? Do i need to modify/add new entry in all users/clients TNSNAMES.ora file ? or there is anyother parameter what we need to set ?
Waiting for reply.

Answer 1

SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Primary database init file :
*.control_files='D:\oracle\product\10.2.0/oradata/primary/\control01.ctl','D:\oracle\product\10.2.0/oradata/primary/\control02.ctl','D:\oracle\product\10.2.0/oradata/primary/\control03.ctl'
*.db_name='primary'
*.db_unique_name='PRIMARY'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=primaryXDB)'
*.log_archive_dest_1='location=D:\oracle\product\10.2.0\oradata\archive'
*.log_archive_dest_state_1=ENABLE
*.log_archive_dest_state_2=ENABLE
*.log_archive_dest_2='SERVICE=standby LGWR ASYNC'
*.log_archive_format='arc_%s_%t_%r.arc'
*.fal_client='PRIMARY'
*.fal_server='STANDBY'
standby database init file :
*.control_files='D:\oracle\product\10.2.0/oradata/primary/STANDBY_CONTROL.CTL'
*.db_name='primary'
*.db_unique_name='STANDBY'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=primaryXDB)'
*.log_archive_dest_1='location=D:\oracle\product\10.2.0\oradata\archive'
*.log_archive_format='arc_%s_%t_%r.arc'
*.log_archive_dest_state_2=ENABLE
*.fal_server='PRIMARY'
*.fal_client='STANDBY'
*.standby_file_management=auto
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