Can one selectively load only the records that one need? (for DBA

ORACLE Interview Questions and Answers (Part 5)

(Continued from previous question...)

885. Can one selectively load only the records that one need? (for DBA

Look at this example, (01) is the first character, (30:37) are characters 30 to 37:
LOAD DATA
INFILE 'mydata.dat' BADFILE 'mydata.bad' DISCARDFILE 'mydata.dis'
APPEND
INTO TABLE my_selective_table
WHEN (01) <> 'H' and (01) <> 'T' and (30:37) = '19991217'
(
region CONSTANT '31',
service_key POSITION(01:11) INTEGER EXTERNAL,
call_b_no POSITION(12:29) CHAR
)

(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?
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• 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.
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• 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.
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• 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.
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• Explain the difference between a FUNCTION, PROCEDURE and PACKAGE.
• Explain the use of table functions.
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• 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?
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• 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?
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• You have just compiled a PL/SQL package but got errors, how would you view the errors?
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• Name two files used for network connection to a database.
• What is the function of Optimizer ?
• What is Execution Plan ?
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• 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 ? )
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• 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 strategies are available for backing-up an Oracle database? (for DBA
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• What are the Built-ins to display the user-named editor?
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• What is a Query Record Group?
• What does the term panel refer to with regard to pages?
• What is a master detail relationship?
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• 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?
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• What tuning indicators can one use? (for DBA
• 813. What tools/utilities does Oracle provide to assist with performance tuning? (for DBA
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• What is hit ratio ?
• How do you implement the If statement in the Select Statement
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• 831. How does one tune Oracle Wait events? (for DBA
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• What is SQL*Loader and what is it used for? (for DBA
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• What are the constructs of a procedure, function or a package ?
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• What are the various types of database triggers ?
• What is the advantage of a stored procedure over a database trigger ?
• What is the maximum no. of statements that can be specified in a trigger statement ?
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• What are the values of :new and :old in Insert/Delete/Update Triggers ?
• What are cascading triggers? What is the maximum no of cascading triggers at a time?
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• What are constraining triggers ?
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• What is the maximum no. of columns a table can have ?
• What is the significance of the & and && operators in PL SQL ?
• Can you pass a parameter to a cursor ?
• What are the various types of RollBack Segments ?
• 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
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• 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)