ORA-01012: not logged on

ORA-01012: not logged on

This may occur generally due to heavy load or out of available connection in the database. If there is maximum number of sessions connected to the database, which is defined by ‘processes‘ parameter and database does not allow sysdba as well as other users to connect to the database. Sometimes it may also occur due to improper shutdown the database. In that case it shows connected but it does not allow to happening any query to the database instead it fails with ORA-01012: not logged on

Sometimes connecting with sysdba shows database in idle instance but whenever you issue startup it fails with ORA-01081: cannot start already-running ORACLE - shut it down first.

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Tablespace Management using Toad

You can view all of your tablespace information using toad tablespace screen from Database –> Administer –> Tablespaces Here each table describes different detailed information across all the tablespaces in database. If you open this screen from the toad DBA module then you are also able to see the “space history” and “IO history” tab along with Files, Free space, object, Fragmentation. With these tab you are able to able perform space monitoring and planning steps. These tab permits you check graphically space and IO usage over time. Through this way DBA are also able to estimate ‘Object size’ based on this estimation. From the below “alter tablespace” tab you can § Modify the tablespace and datafile size. § Add new datafile to the tablespace.

Import Excel Data into Oracle using Oracle form Button

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Changing National Character Set AL16UTF16 to UTF8

Changing National Character Set AL16UTF16 to UTF8 The national character set is used for data that is stored in table columns of the types NCHAR, NVARCHAR2, and NCLOB. In contrast, the database character set is used for data stored in table columns of the types CHAR, VARCHAR2 and CLOB. Like the database character set, the national character set is defined when the database is initially created and can usually no longer be changed, at least not easily or without involving quite a lot of work (export, recreate database, import). Except when creating the database, where the national character set is defined explicitly, it can change implicitly even when upgrading the database from Oracle8i to Oracle9i (or Oracle10g). You require SYSDBA authorization to change the national character set. Changing the national character set means changing an Oracle Dictionary entry, but no data is changed. $sqlplus /nolog SQL> CONNECT / AS SYSDBA SQL> Select property_value fro

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