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Process command execution
Oracle Tips by Burleson Consulting

 



Process command execution

To illustrate the communications between UNIX and Oracle, let’s use the example of a UNIX script that accesses Oracle to display rollback segment information. Because of the complex details and differences in UNIX dialects, this example has been deliberately over-simplified for illustration purposes.

rollstat.ksh
#!/bin/ksh

# First, we must set the environment . . . .
export ORACLE_HOME=$1
ORACLE_HOME=`cat /etc/oratab|grep ^$ORACLE_SID:|cut -f2 -d':'`
export ORACLE_HOME
PATH=$ORACLE_HOME/bin:$PATH
export PATH

$ORACLE_HOME/bin/sqlplus system/manager<<!

select * from v\$rollstat;

exit
!
echo All Done!


Note the reference to the v$rollstat view in the UNIX script as v\$rollstat. In UNIX, you must place a back-slash character in from of every dollar sign in all SQL commands to tell UNIX that the dollar sign is a literal value and not a UNIX shell command.

When we execute this script in UNIX, the script performs the following UNIX system calls:

1 - fork(get_rollstat.ksh)
2 - read(/etc/oratab)
3 - fork(sqlplus)
4 - read(file#,block#)
5 - write(v$rollstat contents)
6 – write(“All Done”)


The above is an excerpt from the "Oracle9i UNIX Administration Handbook" by Oracle press, authored by Donald K. Burleson.

 

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