Oracle triggers if updating performance

A hot backup is basically taking a backup of the database while it is still up and running and it must be in archive log mode.

Use of double ampersands tells SQLPLUS to resubstitute the value for each subsequent use of the variable, a single ampersand will cause a reprompt for the value unless an ACCEPT statement is used to get the value from the user. You want to include a carriage return/linefeed in your output from a SQL script, how can you do this The best method is to use the CHR() function (CHR(10) is a return/linefeed) and the concatenation function "||". CASCADE;) and that you need to concatenate using the ? If you use a min/max function against your rowid and then select against the proposed primary key you can squeeze out the rowids of the duplicate rows pretty quick.

Another method, although it is hard to document and isn? For example: select rowid from emp e where e.rowid (select min(x.rowid) from emp x where x.emp_no = e.emp_no); In the situation where multiple columns make up the proposed key, they must all be used in the where clause. What is a Cartesian product A Cartesian product is the result of an unrestricted join of two or more tables.

In addition, since you are taking cold backups the database does not require being in archive log mode and thus there will be a slight performance gain as the database is not cutting archive logs to disk.

A data block is the smallest unit of logical storage for a database object.

The difference between the two is that the truncate command is a DDL operation and just moves the high water mark and produces few rollback data.

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