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Putty is wonderful client to connect to Linux or Unix server easily. It has the option to connect using both telnet or ssh protocol. It has option of RAW ,serial ,RLogin also It is available for Windows 95, 98, XP, Vista,7 ,10 and It can downloaded from below link Download Putty here How to Setup Putty Client on Windows 1.Download consist of putty.exe executable. Save … Continue reading How to use Putty for SSH »

ORA-29285: file write error is one of the error which may get while doing file handling operation in oracle database   Reason and Resolutions for ORA-29285 File system where you are writing the file is full df -h /u500 /u500  100 0 declare fileHandler UTL_FILE.FILE_TYPE; begin fileHandler := UTL_FILE.FOPEN(‘/u500’, ‘tech’, ‘W’); UTL_FILE.PUT_LINE(fileHandler, ‘This is the file for test’); UTL_FILE.FCLOSE(fileHandler); end; / DECLARE * ERROR at … Continue reading How to resolve ORA-29285: file write error »

ORA-29280: invalid directory path  is a common error when doing file handling operation in Oracle database Reason and Resolution for the error 1.This occur if the directory specified does not exists in utl_file_dir init.ora parameter sqlplus / as sysdba show parameter utl_file_dir /tmp, /usr/tmp/ SQL> declare F_LOG utl_file.file_type; begin F_LOG := utl_file.fopen(‘/u500′,’j’, ‘w’); end; / 2 3 4 5 6 declare * ERROR at line … Continue reading How to Solve ORA-29280: invalid directory path »

ORA-29283 : invalid file operation is quite a common error. It happens mostly because of the two reasons The directory and file should have appropriate  permission at the OS level for the same user which started the Oracle database For example The directory does not exists on OS ls  /u555/app/oracle No such file or directory SQL> declare F_LOG utl_file.file_type; begin F_LOG := utl_file.fopen(‘/u555/app/oracle’,’k’, ‘w’); end; / … Continue reading How to solve ORA-29283 : invalid file operation »

Below query to check locks in oracle database ( Single Instance) SELECT inst_id,DECODE(request,0,’Holder: ‘,’Waiter: ‘)||sid sess, id1, id2, lmode, request, type FROM V$LOCK WHERE (id1, id2, type) IN (SELECT id1, id2, type FROM V$LOCK WHERE request>0) ORDER BY id1, request ;   In case of RAC,below query is used check locks in oracle database SELECT inst_id,DECODE(request,0,’Holder: ‘,’Waiter: ‘)||sid sess, id1, id2, lmode, request, type FROM … Continue reading Queries to check locks in oracle database »

We already know how to create user and grant privileges in a traditional non-CDB database How to Create User in Oracle and Assign privileges In a non-CDB, a user name or Roles cannot begin with C## or c## With 12c , we have a concept of container database (CDB),so things get change with respect to users. We have common user and local users Common users … Continue reading How to create Users and Roles in Oracle database 12c »

A CROSS JOIN  in Oracle is a JOIN operation that produces the Cartesian product of two tables. i,e if one of the table is having 100 rows and another one 8 rows, then cross join will produce 800 rows Here table emp has 14 rows and second table as 1 rows,so total 14 rows are returned. we can create another example table check this So … Continue reading Cross Join in Oracle »

A self join is a join of table to  itself.. We can use the table multiple times .Each occurrence should have an alias name.Oracle database while executing the query join the table with itself and produce the result General  syntax select a.col1 ,b.col2  from mytable a,mytable b where <join condition> ; Some Self Join Example 1) Presentation of Hierarchical data We have a employee table … Continue reading self join in oracle with examples »