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DBA Interview Questions & Answers - Learning Mode
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DBA Interview Questions & Answers - Learning Mode

DBA is also an abbreviation for doing business as - a term sometimes used in business and legal writing. dBA is an abbreviation for A-weighted decibels. A database administrator, frequently known just by the acronym DBA, is a role usually within the Information Technology department, charged with the creation, maintenance, backups, querying, tuning, user rights assignment and security of an organization's databases.

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DBA Interview Questions & Answers - Learning Mode
Try DBA Interview Questions & Answers - Exam Mode
Question: What are the different modals of windows?

Answer: Modeless windows Modal windows. Source: CoolInterview.com
Question: What is the purpose of the IMPORT option IGNORE? What is it's default setting?

Answer: The IMPORT IGNORE option tells import to ignore "already exists" errors. If it is not specified the tables that already exist will be skipped. If it is specified, the error is ignored and the tables data will be inserted. The default value is N. Source: CoolInterview.com
Question: What is the advantage of the library?

Answer: Libraries provide a convenient means of storing client-side program units and sharing them among multiple applications. Once you create a library, you can attach it to any other form, menu, or library modules. When you can call library program units from triggers menu items commands and user named routine, you write in the modules to which you have attach the library. When a library attaches another library, program units in the first library can reference program units in the attached library. Source: CoolInterview.com
Question: How can we specify the Archived log file name format and destination?

Answer: By setting the following values in init.ora file. LOG_ARCHIVE_FORMAT = arch %S/s/T/tarc (%S - Log sequence number and is zero left padded, %s - Log sequence number not padded. %T - Thread number left-zero- padded and %t - Thread number not padded). The file name created is arch 0001 are if %S is used. LOG_ARCHIVE_DEST = path. Source: CoolInterview.com
Question: What is lexical reference?

Answer: Lexical reference is place_holder for text that can be embedded in a SQL statements. A lexical reference can be created using & before the column or parameter name. Source: CoolInterview.com
Question: If you have an example table, what is the best way to get sizing data for the production table implementation?

Answer: The best way is to analyze the table and then use the data provided in the DBA_TABLES view to get the average row length and other pertinent data for the calculation. The quick and dirty way is to look at the number of blocks the table is actually using and ratio the number of rows in the table to its number of blocks against the number of expected rows. Source: CoolInterview.com
Question: What is database clusters?

Answer: Group of tables physically stored together because they share common columns and are often used together is called Cluster. Source: CoolInterview.com
Question: Do you consider yourself a development DBA or a production DBA and why?

Answer: You take this as a trick question and explain it that way. Never in my database carrier have I distinguished between "development" and "production." Just ask your development staff or VP of engineering how much time and money is lost if development systems are down. Explain to the interviewer that both systems are equally important to the operation of the company and both should be considered as production systems because there are people relying on them and money is lost if either one of them i Source: CoolInterview.com
Question: What is WHEN-Database-record trigger?

Answer: Fires when oracle forms first marks a record as an insert or an update. The trigger fires as soon as oracle forms determines through validation that the record should be processed by the next post or commit as an insert or update. Generally occurs only when the operators modifies the first item in the record, and after the operator attempts to navigate out of the item. Source: CoolInterview.com
Question: What is a User_exit?

Answer: Calls the user exit named in the user_exit_string. Invokes a 3Gl program by name which has been properly linked into your current oracle forms executable. Source: CoolInterview.com
Question: How can you enable automatic archiving?

Answer: Shut the database Backup the database Modify/Include LOG_ARCHIVE_START_TRUE in init.ora file. Start up the database. Source: CoolInterview.com
Question: What is Functional Dependency?

Answer: A Functional dependency is denoted by X Y between two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This means the value of X component of a tuple uniquely determines the value of component Y. Source: CoolInterview.com
Question: How can a square be drawn in the layout editor of the report writer?

Answer: By using the rectangle tool while pressing the (Constraint) key. Source: CoolInterview.com
Question: What use of command line parameter cmd file?

Answer: It is a command line argument that allows you to specify a file that contain a set of arguments for r20run. Source: CoolInterview.com
Question: What is Durability in DBMS?

Answer: Once the DBMS informs the user that a transaction has successfully completed, its effects should persist even if the system crashes before all its changes are reflected on disk. This property is called Durability. Source: CoolInterview.com
Question: What is Lossless Join Property in case of DBMS?

Answer: Lossless Join Property in case of DBMS guarantees that the spurious tuple generation does not occur with respect to relation schemas after decomposition. Source: CoolInterview.com
Question: What is Relational Calculus in case of DBMS?

Answer: Relational Calculus in case of DBMS is an applied predicate calculus specifically tailored for relational databases proposed by E.F. Codd. E.g. of languages based on it are DSL ALPHA, QUEL. Source: CoolInterview.com
Question: How would you go about increasing the buffer cache hit ratio?

Answer: Use the buffer cache advisory over a given workload and then query the v$db_cache_advice table. If a change was necessary then I would use the alter system set db_cache_size command. Source: CoolInterview.com
Question: What is a Sequence?

Answer: A sequence generates a serial list of unique numbers for numerical columns of a database?s tables. Source: CoolInterview.com
Question: Do you consider yourself a development DBA or a production DBA and why?

Answer: You take this as a trick question and explain it that way. Never in my database carrier have I distinguished between "development" and "production." Just ask your development staff or VP of engineering how much time and money is lost if development systems are down. Explain to the interviewer that both systems are equally important to the operation of the company and both should be considered as production systems because there are people relying on them and money is lost if either one of them i Source: CoolInterview.com

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
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Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
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