What are the values of :new and :old in Insert/Delete/Update Triggers ?

ORACLE Interview Questions and Answers (Part 5)

(Continued from previous question...)

19.What are the values of :new and :old in Insert/Delete/Update Triggers ?

INSERT : new = new value, old = NULL
DELETE : new = NULL, old = old value
UPDATE : new = new value, old = old value

(Continued on next question...)

Other Interview Questions

• Is it possible to split the print reviewer into more than one region?
• Is it possible to center an object horizontally in a repeating frame that has a variable horizontal size?
• For a field in a repeating frame, can the source come from the column which does not exist in the data group which forms the base for the frame?
• Can a field be used in a report without it appearing in any data group?
• The join defined by the default data link is an outer join yes or no?
• Can a formula column referred to columns in higher group?
• Can a formula column be obtained through a select statement?
• Is it possible to insert comments into sql statements return in the data model editor?
• Is it possible to disable the parameter from while running the report?
• When a form is invoked with call_form, Does oracle forms issues a save point?
• Explain the difference between a hot backup and a cold backup and the benefits associated with each.
• You have just had to restore from backup and do not have any control files. How would you go about bringing up this database?
• How do you switch from an init.ora file to a spfile?
• Explain the difference between a data block, an extent and a segment.
• Give two examples of how you might determine the structure of the table DEPT.
• Where would you look for errors from the database engine?
• Compare and contrast TRUNCATE and DELETE for a table.
• Give the reasoning behind using an index.
• Give the two types of tables involved in producing a star schema and the type of data they hold.
• What type of index should you use on a fact table?
• Give two examples of referential integrity constraints.
• A table is classified as a parent table and you want to drop and re-create it. How would you do this without affecting the children tables?
• Explain the difference between ARCHIVELOG mode and NOARCHIVELOG mode and the benefits and disadvantages to each.
• What command would you use to create a backup control file?
• Give the stages of instance startup to a usable state where normal users may access it.
• What column differentiates the V$ views to the GV$ views and how?
• How would you go about generating an EXPLAIN plan?
• How would you go about increasing the buffer cache hit ratio?
• Explain an ORA-01555
• Explain the difference between $ORACLE_HOME and $ORACLE_BASE.
• How would you determine the time zone under which a database was operating?
• Explain the use of setting GLOBAL_NAMES equal to TRUE.
• What command would you use to encrypt a PL/SQL application?
• Explain the difference between a FUNCTION, PROCEDURE and PACKAGE.
• Explain the use of table functions.
• Name three advisory statistics you can collect.
• Where in the Oracle directory tree structure are audit traces placed?
• Explain materialized views and how they are used.
• When a user process fails, what background process cleans up after it?
• What background process refreshes materialized views?
• How would you determine what sessions are connected and what resources they are waiting for?
• Describe what redo logs are.
• How would you force a log switch?
• Give two methods you could use to determine what DDL changes have been made.
• What does coalescing a tablespace do?
• What is the difference between a TEMPORARY tablespace and a PERMANENT tablespace?
• Name a tablespace automatically created when you create a database.
• When creating a user, what permissions must you grant to allow them to connect to the database?
• How do you add a data file to a tablespace
• How do you resize a data file?
• What view would you use to look at the size of a data file?
• What view would you use to determine free space in a tablespace?
• How would you determine who has added a row to a table?
• How can you rebuild an index?
• Explain what partitioning is and what its benefit is.
• You have just compiled a PL/SQL package but got errors, how would you view the errors?
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• What is Execution Plan ?
• Can one resize tablespaces and data files? (for DBA)
• What is SAVE POINT ?
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• Can one rename a tablespace? (for DBA)
• What is RULE-based approach to optimization ?
• What are the values that can be specified for OPTIMIZER_GOAL parameter of the ALTER SESSION Command ? )
• How does one create a standby database? (for DBA)
• How does one give developers access to trace files (required as input to tkprof)? (for DBA)
• What are the responsibilities of a Database Administrator ?
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• What are the roles and user accounts created automatically with the database?
• What are the minimum parameters should exist in the parameter file (init.ora) ?
• Why and when should I backup my database? (for DBA
• What strategies are available for backing-up an Oracle database? (for DBA
• What is the difference between online and offline backups? (for DBA
• What is the difference between restoring and recovering? (for DBA
• How does one backup a database using the export utility? (for DBA
• What are the built_ins used the display the LOV?
• How do you call other Oracle Products from Oracle Forms?
• What is the main diff. bet. Reports 2.0 & Reports 2.5?
• What are the Built-ins to display the user-named editor?
• How many number of columns a record group can have?
• What is a Query Record Group?
• What does the term panel refer to with regard to pages?
• What is a master detail relationship?
• What is a library?
• What is an anchoring object and what is its use? What are the various sub events a mouse double click event involves?
• Use the add_group_column function to add a column to record group that was created at a design time?
• What are the various sub events a mouse double click event involves? What are the various sub events a mouse double click event involves?
• What is the use of break group? What are the various sub events a mouse double click event involves?
• What tuning indicators can one use? (for DBA
• 813. What tools/utilities does Oracle provide to assist with performance tuning? (for DBA
• What is STATSPACK and how does one use it? (for DBA
• What are the common RMAN errors (with solutions)? (for DBA
• How can you execute the user defined triggers in forms 3.0 ?
• What ERASE package procedure does ?
• What is the difference between NAME_IN and COPY ?
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• How do you implement the If statement in the Select Statement
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• How does one manage Oracle database users? (for DBA
• 831. How does one tune Oracle Wait events? (for DBA
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• Are there any undocumented commands in Oracle? (for DBA
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• What are the constructs of a procedure, function or a package ?
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• What is the maximum no. of statements that can be specified in a trigger statement ?
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• What are cascading triggers? What is the maximum no of cascading triggers at a time?
• What are mutating triggers ?
• What are constraining triggers ?
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• What is the use of Data Dictionary ?
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• Can Check constraint be used for self referential integrity ? How ?
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• What is the difference between unique key and primary key ?
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• Can you pass a parameter to a cursor ?
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• Can you use %RowCount as a parameter to a cursor ?
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• Is the assignment given below allowed : ABC = PQR (Where ABC and PQR are records)
• Is this for loop allowed : For x in &Start..&End Loop
• How many rows will the following SQL return : Select * from emp Where rownum
• How many rows will the following SQL return : Select * from emp Where rownum = 10;
• Which symbol preceeds the path to the table in the remote database ?
• Are views automatically updated when base tables are updated ?
• Can a trigger written for a view ?
• If all the values from a cursor have been fetched and another fetch is issued, the output will be : error, last record or first record ?
• A table has the following data : [[5, Null, 10]]. What will the average function return ?
• Is Sysdate a system variable or a system function?
• Consider a sequence whose currval is 1 and gets incremented by 1 ...
• Definition of relational DataBase by Dr. Codd (IBM)?
• What is Multi Threaded Server (MTA) ?
• Which are initial RDBMS, Hierarchical & N/w database ?
• What is Functional Dependency
• What is Auditing ?
• While designing in client/server what are the 2 imp. things to be considered ?
• When to create indexes ?
• How can you avoid indexes ?
• What is the result of the following SQL ...
• Can database trigger written on synonym of a table and if it can be then what would be the effect if original table is accessed.
• Can you alter synonym of view or view ?
• Can you create index on view
• What is the difference between a view and a synonym ?
• What is the difference between alias and synonym ?
• What is the effect of synonym and table name used in same Select statement ?
• What's the length of SQL integer ?
• What is the difference between foreign key and reference key ?
• Can dual table be deleted, dropped or altered or updated or inserted ?
• If content of dual is updated to some value computation takes place or not ?
• If any other table same as dual is created would it act similar to dual?
• For which relational operators in where clause, index is not used ?
• Assume that there are multiple databases running on one machine. How can you switch from one to another ?
• What are the advantages of Oracle ?
• What is a forward declaration ? What is its use ?
• What are actual and formal parameters ?
• What are the types of Notation ?
• What all important parameters of the init.ora are supposed to be increased if you want to increase the SGA size ?
• If I have an execute privilege on a procedure in another users schema, can I execute his procedure even though I do not have privileges on the tables within the procedure ?
• What are various types of joins ?
• What is a package cursor ?
• If you insert a row in a table, then create another table and then say Rollback. In this case will the row be inserted ?
• What are the various types of queries ??
• What is a transaction ?
• What is implicit cursor and how is it used by Oracle ?
• Which of the following is not a schema object : Indexes, tables, public synonyms, triggers and packages ?
• What is PL/SQL?
• Is there a PL/SQL Engine in SQL*Plus?
• Is there a limit on the size of a PL/SQL block?
• Can one read/write files from PL/SQL?
• How can I protect my PL/SQL source code?
• ORACLE Interview Questions and Answers (Part 5)
• Oracel Interview Question Only (1)
• Oracel Interview Question Only (2)