All backups and archived redo logs used for creating and recovering the duplicate database, however, must be accessible by the server session on the duplicate host.A requirement arises in many systems to update multiple SQL database rows.The duplicate database can be identical to the target database or contain only a subset of the tablespaces in the target database. A standby database is a copy of the primary database that you can update continually or periodically with archived logs from the primary database.If the primary database is damaged or destroyed, then you can perform failover to the standby database and transform it into the new primary database.Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.We are going to update column DESCRIPTION and PICTURE in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID. Update data in a column in table A based on a common column in table B. Update data in two columns in table A based on a common column in table B. Conditionally update data in table A based on a common column in table B. No portion may be reproduced without my written permission.
For the duplication to work, you must connect RMAN to both the target (primary) database and an auxiliary instance started in mode.
And it does precisely that through its implementation of the datatype, such as a number or string.
It’s rare, in fact, that the data with which you are working is just a single value, so records and other composite datatypes are likely to figure prominently in your PL/SQL programs.
In the case where the application server and database server are on different hosts, the round-trip will involve network latency as well.
The dominant factor in the time taken to complete the overall operation tends to be the “admin” work in conveying the application’s intention to the database server rather than the actual updates to the database.
But we can group the updates according to the value being set, and then do one UPDATE statement per distinct value.