Dataguard Protectin Mode

Question

Hi,
I just would like to understand as how Dataguard protection mode works. I have changed from the "ARCH" attribute to "LGWR" attribute of the LOG_ARCHIVE_DEST_n initialization parameter as below. But I have not changed the protection mode. I do not know whether there is any impact in the behavior of the database, if we do not change the mode from "MAXIMUM PERFORMANCE" to "MAXIMUM AVAILABILITY".
Your clarification will be appreciated.
log_archive_dest_2 =
SERVICE=O01CAS3DR VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=O01CAS3DR LGWR SYNC NOAFFIRM
sql> select PROTECTION_MODE,PROTECTION_LEVEL from v$database;
PROTECTION_MODE PROTECTION_LEVEL
MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
Set Appropriate Database Protection Mode:
You can choose between three protection modes, with different logging options. Each mode for your environment has a different impact on availability, costs, data loss, performance, and scalability. Choose one of the following depending on your service level agreements:
· Maximum Protection mode with LGWR SYNC AFFIRM option for an environment that requires no data loss and no divergence. Performance overhead is incurred.
· Maximum Availability mode with LGWR SYNC AFFIRM option for an environment that needs no data loss but tolerates divergence when sites are temporarily inaccessible.
· Maximum Performance mode with LGWR ASYNC (AFFIRM or NOAFFIRM) option for an environment that tolerates minimal data loss and divergence when sites are temporarily inaccessible. Performance overhead is minimized.

Answer 1

Hi..
Do you know at what time do you want to open the read only database.I thinks the steps will be
1. alter database recover managed standby cancel;
2. alter database open read only;
This will open the database
After the batch report is done, then a script must be run where
1. shu immediate;
2. startup nomount
3. alter database mount standby database;
4. alter database recover managed standby database disconnect from session;
Now, you need to put all these steps in the script.
Anand