Category Archives: SQL

Delete Delete Faster Faster ;)

3 Replies

2-3 days ago, I came across a code, intended to make delete faster. Just have a look 😉

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LOOP
SELECT COUNT (1)
INTO v_cnt
FROM table1
WHERE ROWNUM < 2;

IF v_cnt = 0
THEN
EXIT;
END IF;

DELETE FROM table1
WHERE ROWNUM < 1000;

COMMIT;
v_cnt := 0;
END LOOP;
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Missing grants

2 Replies

Today one of my colleague was working on a simple PL/SQL procedure. Based on some logic it was returning count(*) from all_tab_columns for few tables. It gave count incorrectly for one table out of around fifty in total. He just hard coded the table name and ran it but again it showed count as zero.

Then he took the code out of procedure and wrote it in DECLARE, BEGIN, END and after running it showed the correct count. But ran as database procedure it always shows incorrectly.

Finally just as hit and trial, he gave SELECT on the TABLE to database user [Table was in different schema], used to run the procedure and everything was ok. Isn’t it bit stupid 🙂

Update: Well, it happens for a reason. Nigel Thomas pointed out in the comment. The reason is that privileges granted to a role are not seen from PL/SQL stored procedures. You need to give direct grant to the user for this or another method is to define the procedure or package with invoker rights.

Thanks Nigel 🙂

Shell script to spool a no of tables into .xls files…

2 Replies

On OTN someone asked a question that how to spool data from a table into a xls file. Spooling a single table I discussed in one of the previous posts. We can use the same approach to spool data from more than 1 table also. Well here I will do it through a shell script and assume that you have a text file having list of tables to be spooled (Even if you don’t have one, it can be easily made by spooling the names of tables into a simple text file) Here is the shell script that you can use to spool data to various xls files, table wise.

cat list.txt | while read a
do
echo "spooling $a"
sqlplus username/password@string &lt;&lt;EOF
set feed off markup html on spool on
spool /home/oracle/$a.xls
select * from $a;
spool off
set markup html off spool off
EOF
done

I didn’t see any work around for Windoze as SQLPLUS << EOF thing doesn’t seem to work in Windows. Will try to find some alternative. If you come across something, do let me know.

Sidhu