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Question

Hi,
I am new to data guard and was going through the docs, i do understand what a physical standby and logical standby database is.
In both the redo logs are applied in physical its redo apply and in logical its sql apply, but i want to know as to how these redo logs get automatically transferred from production to standy database? which parameter is set during configuration that makes these changes.
Also do the production and standy share a common archive log destination or recovery destination or its different or different.
thanks,

Answer 1

thanks you for quick response Asif,
I have gone through the link, i am confused as to which parameter helps in transfering the redo from primary to standy
From the below standyby server and primary database pfile's which parameter transfers the redo logs
Note: We will be modifying both the primary and standby parameter files to handle being in either the primary or the standby mode for quick switchovers.
Standby Database Parameters (changes in copy of primary’s values):
Change pathnames, such as control_files, background_dump_dest,
core_dump_dest, user_dump_dest, and audit_file_dest, and add:
# log_archive_dest = /orcl/oradata/PROD2/archivelogs
log_archive_dest_1 = ‘LOCATION=/orcl/oradata/PROD2/archivelogs MANDATORY’ # for switchover
log_archive_dest_state_1 = ENABLE # for switchover
log_archive_dest_2 = ‘SERVICE=myserver_prod LGWR SYNC’ # for switchover
log_archive_dest_state_2 = ENABLE # for switchover
standby_archive_dest = /orcl/oradata/PROD2/archivelogs
standby_file_management = AUTO # or MANUAL for raw devices
remote_archive_enable = TRUE # TRUE or RECEIVE, change RECEIVE to SEND on switchover
instance_name = PROD2
lock_name_space = PROD2 # use when primary and standby on same system; same as instance_name
fal_server = myserver_prod # “fal” is Fetch Archive Log, for log gap resolution
fal_client = myserver_prod2
db_file_name_convert = (‘/PROD/’,'/PROD2/’)
log_file_name_convert = (‘/PROD/’,'/PROD2/’)
Primary Database Parameters (changes in primary’s values):
#log_archive_dest = /orcl/oradata/PROD/archivelogs
log_archive_dest_1 = ‘LOCATION=/orcl/oradata/PROD/archivelogs MANDATORY’
log_archive_dest_state_1 = ENABLE
log_archive_dest_2 = ‘SERVICE=myserver_prod2 LGWR SYNC’
log_archive_dest_state_2 = ENABLE
standby_archive_dest = /orcl/oradata/PROD/archivelogs # for switchover
standby_file_management = AUTO # for switchover; or MANUAL for raw devices
remote_archive_enable = TRUE # TRUE or SEND, change SEND to RECEIVE on switchover
instance_name = PROD
lock_name_space = PROD # use when primary and standby on same system; same as instance_name
fal_server = myserver_prod2 # for switchover
fal_client = myserver_prod # for switchover
db_file_name_convert = (‘/PROD2/’,'/PROD/’) # for switchover
log_file_name_convert = (‘/PROD2/’,'/PROD/’) # for switchover
(If primary uses spfile, wait until after the standby database
files are copied/created to make these parameter changes.)
Standby Database Datafiles, etc.thanks again,
regards,