What is the difference between real time apply and redo apply?

By default, the redo data is applied from archived redo log files. When performing Redo Apply, a physical standby database can use the real-time apply feature to apply redo directly from the standby redo log files as they are being written by the RFS process.

How would you delay the application of logs to a physical standby?

You can set a time delay on primary and standby databases using the DE LAY= minutes attribute of the LOG_ARCHIVE_DEST_ n initialization parameter to delay applying archived redo log files to the standby database. By default, there is no time delay.

How do I start SQL Apply in logical standby?

To do this, you must:

Specify the set of tables on the logical standby database to which an application can write data by executing the DBMS_LOGSTDBY. SKIP procedure. Skipped tables are not maintained through SQL Apply.
Set the database guard to protect only standby tables.

How do you stop and start logical standby database?

Startup/Shutdown Logical Standby Database

On Primary do the following : SQL > alter system switch logfile ; SQL > alter system archive log current ;
Go to Standby : SQL> ALTER DATABASE STOP LOGICAL STANDBY APPLY; SQL> shutdown immediate;
Primary Database : SQL> shutdown immediate;
Standby Database: SQL > startup.

How do I check logical standby?

If you would like to know the brief status of the logical standby sql apply status, we can query “v$logstdby_state” this view provides consolidated information from views v$logstdby and v$logstdby_stats.

How do I skip transactions in logical standby?

Just a simple IT professional

select * from DBA_LOGSTDBY_EVENTS order by EVENT_TIMESTAMP, COMMIT_SCN; Using this query, transaction identification information is listed.
ALTER DATABASE STOP LOGICAL STANDBY APPLY; Then, transaction is skipped.
EXECUTE DBMS_LOGSTDBY.
ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;

What is the difference between physical standby and logical standby?

The logical standby database is a database that does not have the schema structure exactly similar to the source database. In contrast, a physical standby database is a database that replicates the exact contents of its primary database across the Oracle Net Network layer.

How do I start a logical standby database?

To start real-time apply on the logical standby database, issue the following statement: SQL> ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE; Oracle recommends that you run SQL Apply in the real-time apply mode. See also Section 3.1.

How to start real time apply on logical standby database?

To start real-time apply on the logical standby database to immediately apply redo data from the standby redo log files on the logical standby database, include the IMMEDIATE keyword as shown in the following statement: To stop SQL Apply, issue the following statement on the logical standby database:

How does real time apply work in Oracle Database?

However, if a standby redo log is used, real time apply can be enabled, which allows Data Guard to recover redo data from the current standby redo log as it is being filled by the RFS process. This facility of real time apply is a new feature introduced in Oracle database 10 g.

Can you log apply services on a physical standby database?

Note that log apply services cannot apply redo data to a physical standby database when it is opened in read-only mode. To start log apply services on a physical standby database, ensure the physical standby database is started and mounted and then start Redo Apply using the SQL ALTER DATABASE RECOVER MANAGED STANDBY DATABASE statement.

How to recover a physical standby database in Oracle?

For physical standby databases, issue the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE statement. For logical standby databases, issue the ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE statement.

What is the difference between real time apply and redo apply?