10-24-2011
a delete script which reads number of days, location and file type as the parameters from the config file.
First, it has to check SET UP VALUES.
For example,
if set up value is "$PROCESS#|#25#|#.dat" then
we have to delete all .dat file older than 25 days from processed directory.
Example second: Here , file directory is null then we have to read for default section mentioned. ALL: i.e $PROCESSED and $REJECTED.
#|#25#|#.xls
Hope this is clear now..
Thanks and Regards
Nagaraja AKkivalli.
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LEARN ABOUT REDHAT
set_transaction
SET
TRANSACTION(7) SQL Commands SET TRANSACTION(7)
NAME
SET TRANSACTION - set the characteristics of the current transaction
SYNOPSIS
SET TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE }
SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL
{ READ COMMITTED | SERIALIZABLE }
DESCRIPTION
This command sets the transaction isolation level. The SET TRANSACTION command sets the characteristics for the current SQL-transaction. It
has no effect on any subsequent transactions. This command cannot be used after the first query or data-modification statement (SELECT,
INSERT, DELETE, UPDATE, FETCH, COPY) of a transaction has been executed. SET SESSION CHARACTERISTICS sets the default transaction isolation
level for each transaction for a session. SET TRANSACTION can override it for an individual transaction.
The isolation level of a transaction determines what data the transaction can see when other transactions are running concurrently.
READ COMMITTED
A statement can only see rows committed before it began. This is the default.
SERIALIZABLE
The current transaction can only see rows committed before first query or data-modification statement was executed in this transac-
tion.
Tip: Intuitively, serializable means that two concurrent transactions will leave the database in the same state as if the two has
been executed strictly after one another in either order.
NOTES
The session default transaction isolation level can also be set with the command
SET default_transaction_isolation = 'value'
and in the configuration file. Consult the Administrator's Guide for more information.
COMPATIBILITY
SQL92, SQL99
SERIALIZABLE is the default level in SQL. PostgreSQL does not provide the isolation levels READ UNCOMMITTED and REPEATABLE READ. Because of
multiversion concurrency control, the SERIALIZABLE level is not truly serializable. See the User's Guide for details.
In SQL there are two other transaction characteristics that can be set with these commands: whether the transaction is read-only and the
size of the diagnostics area. Neither of these concepts are supported in PostgreSQL.
SQL - Language Statements 2000-11-24 SET TRANSACTION(7)