Posts
Substituting from this line to the end of the file (in Vim)
In vim, if you want to change something from the current line until the end of the line, you can use .,$ as the range segment of the s command. :.,$s/COMPILE/COMPILE BODY/g Substituting over the full file is done by using the % range, which is a shortcut for 1,$, ie from the first to the last line. :%s/COMPILE/COMPILE BODY/g
Selecting random rows
If you want to select random rows from a table, you can order the rows using the dbms_random.value function : SELECT column FROM table ORDER BY dbms_random.value To get 20 random rows from the table, we can add a condition on rownum. This selects the first 20 rows : SELECT column FROM ( SELECT column FROM table ORDER BY dbms_random.value ) WHERE rownum < 21 With thanks to this site.
Recompiling database objects
The DBMS_UTILITY package has a function called compile_schema that compiles all procedures, functions, packages, and triggers. EXEC DBMS_UTILITY.compile_schema(schema => 'SCOTT'); You can also use the UTL_RECOMP package, but I haven’t tried that one yet. With thanks to this ORACLE-BASE article.
Jerusalem
A day trip to Jerusalem while in Israel for work is a no-brainer.
View of the city walls
Korn shell way of checking if environment variable is set
Sometimes you have to check if a variable is set and exit if it’s not. The following code does it in a nice and simple way : error_mess="This environment variable should be set" : ${ORACLE_HOME:?$error_mess} The output looks like this : ./script.sh[3]: ORACLE_HOME: This environment variable should be set The script exits after checking ORACLE_HOME, none of the following commands get executed. I found this in the sample chapter of the The Korn Shell: Unix & Linux Programming Manual, 3rd Edition book.