SQL - MemoSoup

Oracle: converting timestamp to date

Here is the method to display timestamp in the convenient format:

SELECT TO_CHAR (SYSTIMESTAMP, ‘YYYY-MM-DD HH24:MI:SS’) s_date FROM DUAL;

Simple conversion of the timestamp:

SELECT CAST(SYSTIMESTAMP AS DATE) x_date FROM DUAL;

Oracle: kill session

The command to kill Oracle is simple:

ALTER SYSTEM KILL SESSION ‘&sid,&serial’;

sid – session ID serial – session serial number

If the version 11g and this is RAC, additional syntax is possible:

ALTER SYSTEM KILL SESSION ‘&sid,&serial,@&inst_id’;

inst_id – instance id number (1, 2, 3 …)

Script to find the TOAD session [...]

mySQL: How to reset root password

If the password for the mysql “root” user is lost, it’s still possible reset it to some other value. The restart of the mySQL server will be necessary, of course.

The following should be done:

Stop the server It could be done normally:

/etc/init.d/mysql stop

or effectively:

ps -ef | grep mysql … mysql 25079 [...]

Oracle: get the tablespace structure

The easiest method to get the tablespace structure is to use the dbms_metadata package:

SET linesize 200 LONG 50000 pagesize 5000 SELECT dbms_metadata.get_ddl(’TABLESPACE’,tablespace_name ) FROM dba_tablespaces WHERE tablespace_name IN ( ‘&your_tablespace’ );

Additionally, exp/imp (or expdp/impdp) utilities could be used. They could generate the DDL statements for all objects in the database, which could be [...]

Oracle: buffer overflow (ORU-10027)

Sometimes it’s necessary to show the output of the PL/SQL script. Usually the dbms_output package is used:

SET serveroutput ON DECLARE i NUMBER ; BEGIN i:=0 ; WHILE i< 100000 LOOP i:=i+1 ; dbms_output.put_line(’This is just test line #’ || TO_CHAR(i) ) ; END LOOP ; END; /

After several thousands lines the [...]

Oracle: how to clone profiles

Here is the simple script for cloning the Oracle profiles.

SET serveroutput ON DECLARE CURSOR c_profiles IS SELECT PROFILE, RESOURCE_NAME, LIMIT FROM dba_profiles ORDER BY PROFILE, resource_name; s_PROFILE dba_profiles.PROFILE%TYPE ; s_prev_PROFILE dba_profiles.PROFILE%TYPE ; s_RESOURCE_NAME [...]

Oracle: quotes and quote operator

There are several methods to put the quote into the string.

The first (and very traditional) one: use 2 quotes.

SELECT ‘This ” is quote’ FROM dual;

If there are more than one quote, it’s difficult to read and write such strings

The second: use chr(39)

SELECT ‘This ‘ || CHR(39) || ‘ is quote’ [...]

Oracle: problem relinking binaries on Solaris

I’ve got the following message relinking the binaries on Solaris:

ld: fatal: dlopen() of support library (libmakestate.so.1) failed with error:

ld.so.1: /usr/ccs/bin/sparcv9/ld: fatal: /usr/lib/libmakestate.so.1: wrong ELF class: ELFCLASS32

The problem was caused by missing 64-bit library libmakestate.so.1 in /usr/lib.

The normal library should look like the following:

[#] file /usr/lib/sparcv9/libmakestate.so.1 libmakestate.so.1: ELF 64-bit MSB dynamic [...]

Oracle: eval function

The function takes some expression as the argument and executes it, returning output in the varchar string

CREATE OR REPLACE FUNCTION eval (expr VARCHAR2) RETURN VARCHAR2 AS ret VARCHAR2(4000); BEGIN EXECUTE IMMEDIATE ‘begin :result := ‘ || expr || ‘; end;’ USING OUT ret; RETURN ret; END; /

The discussion and examples [...]

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