How does Space allocation table place within a block ?

1 Answer

Answer :

Each block contains entries as follows
Fixed block header
Variable block header
Row Header,row date (multiple rows may exists)
PCTEREE (% of free space for row updation in future)

Related questions

Description : How will you monitor the space allocation ?

Last Answer : By querying DBA_SEGMENT table/view.

Description : ................. maintains the list of free disk blocks in the Unix file system. (A) I-node (B) Boot block (C) Super block (D) File allocation table

Last Answer : (C) Super block 

Description : Committed block sometimes refer to a BASE TABLE ?

Last Answer : False

Description : Table Space,Data Files,Parameter File, Control Files

Last Answer : Table Space :: The table space is useful for storing the data in the database.When a database is created two table spaces are created. a) System Table space :: This data file stores all the tables ... They contain the Db name, name and location of dbs, data files ,redo log files and time stamp.

Description : How will you swap objects into a different table space for an existing database ?

Last Answer : Export the user Perform import using the command imp system/manager file=export.dmp indexfile=newrite.sql. This will create all definitions into newfile.sql. Drop necessary objects. Run the script newfile.sql after altering the tablespaces. Import from the backup for the necessary objects.

Description : In ............ allocation method for disk block allocation in a file system, insertion and deletion of blocks in a file is easy. (A) Index (B) Linked (C) Contiguous (D) Bit Map

Last Answer : (B) Linked

Description : Explain the difference between a data block, an extent and a segment.

Last Answer : A data block is the smallest unit of logical storage for a database object. As objects grow they take chunks of additional storage that are composed of contiguous data blocks. These groupings ... that an object takes when grouped together are considered the segment of the database object.

Description : How to define data block size?

Last Answer : A data block size is specified for each Oracle database when the database is created. A database users and allocated free database space in Oracle data blocks. Block size is specified in init.ora file and cannot be changed latter.

Description : What is data block?

Last Answer : Oracle database's data is stored in data blocks. One data block corresponds to a specific number of bytes of physical database space on disk.

Description : Can object group have a block?

Last Answer : Yes , object group can have block as well as program units.

Description : What are the Various Block Coordination Properties

Last Answer : The various Block Coordination Properties are a) Immediate Default Setting. The Detail records are shown when the Master Record are shown. b) Deffered with Auto Query Oracle Forms defer fetching the ... No Auto Query The operator must navigate to the detail block and explicitly execute a query

Description : What are the different types of Coordinations of the Master with the Detail block?

Last Answer : POPULATE_GROUP(function) POPULATE_GROUP_WITH_QUERY(function) SET_GROUP_CHAR_CELL(procedure) SET_GROUPCELL(procedure) SET_GROUP_NUMBER_CELL(procedure)

Description : What are the components of a PL/SQL block ?

Last Answer : A set of related declarations and procedural statements is called block.

Description : What are the components of a PL/SQL Block ?

Last Answer : Declarative part, Executable part and Exception part.Datatypes PL/SQL

Description : Explain how procedures and functions are called in a PL/SQL block ?

Last Answer : Function is called as part of an expression. sal := calculate_sal ('a822'); procedure is called as a PL/SQL statement calculate_bonus ('A822');

Description : Explain types of Block in forms4.0?

Last Answer : Base table Blocks. Control Blocks. 1. A base table block is one that is associated with a specific database table or view. 2. A control block is a block that is not associated with a database table. ITEMS

Description : List the system variables related in Block and Field?

Last Answer : 1. System.block_status 2. System.current_block 3. System.current_field 4. System.current_value 5. System.cursor_block 6. System.cursor_field 7. System.field_status.

Description : What does an on-clear-block Trigger fire?

Last Answer : It fires just before SQL * forms the current block.

Description : What is Post-Block is a. ???

Last Answer : a. Navigational Trigger. b. Key trigger c. Transaction Trigger.

Description : Can we use GO-BLOCK package in a pre-field trigger ?

Last Answer : No

Description : Give the sequence in which triggers fired during insert operations, when the following 3 triggers are defined at the same block level ?

Last Answer : a. ON-INSERT b. POST-INSERT c. PRE-INSERT

Description : Which parameter in Storage clause will reduce no. of rows per block?

Last Answer : PCTFREE parameter Row size also reduces no of rows per block.

Description : What are the two phases of block coordination?

Last Answer : There are two phases of block coordination: the clear phase and the population phase. During, the clear phase, Oracle Forms navigates internally to the detail block and flushes the obsolete ... with the new master record. These operations are accomplished through the execution of triggers.

Description : What database block size should I use? (for DBA)

Last Answer : Oracle recommends that your database block size match, or be multiples of your operating system block size. One can use smaller block sizes, but the performance cost is significant. Your choice should ... 8K. This is because volume manager products use 8K blocks (and this is not configurable).

Description : How to define Data Block size ?

Last Answer : A data block size is specified for each ORACLE database when the database is created. A database users and allocated free database space in ORACLE datablocks. Block size is specified in INIT.ORA file and can’t be changed latter.

Description : What is Oracle Block? Can two Oracle Blocks have the same address?

Last Answer : Oracle formats the database files into a number of Oracle blocks when they are first created-making it easier for the RDBMS software to manage the files and easier to read data into the memory areas ... at 1. Two blocks can have the same block address if they are in different database files.

Description : The ability to find an individual item in a file immediately _____ is used. 1) File allocation table 2) Directory 3) Sequential access 4) Direct access 4 5) None of these

Last Answer : Answer :1

Description : The ability to find an individual item in a file immediately _____ is used: a) file allocation table b) directory c) sequential access d) direct access e) None of The Above

Last Answer : a) file allocation table

Description : FAT stands for 1) File Accomdation Table 2) File Access Tape 3) File Allocation Table 4) File Activity Table

Last Answer : 3) File Allocation Table

Description : FAT stands for 1 File Accomdation Table 2 File Access Tape 3 File Allocation Table 4 File Activity Table

Last Answer : 3 File Allocation Table

Description : Which of the following information not included in memory table? A) The allocation of main memory to process. B) The allocation of secondary memory to process C) Any information needed to manage virtual memory D) Any information about the existence of file

Last Answer : D) Any information about the existence of file

Description : Can you use a commit statement within a database trigger?

Last Answer : No

Description : Can one export a subset of a table? (for DBA

Last Answer : From Oracle8i one can use the QUERY= export parameter to selectively unload a subset of the data from a table. Look at this example: exp scott/tiger tables=emp query=\"where deptno=10\"

Description : How can you gather statistics on a table?

Last Answer : The ANALYZE command.

Description : How would you determine who has added a row to a table?

Last Answer : Turn on fine grain auditing for the table.

Description : Explain the use of table functions.

Last Answer : Table functions are designed to return a set of rows through PL/SQL logic but are intended to be used as a normal table or view in a SQL statement. They are also used to pipeline information in an ETL process.

Description : 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?

Last Answer : Disable the foreign key constraint to the parent, drop the table, re- create the table, enable the foreign key constraint.

Description : What type of index should you use on a fact table?

Last Answer : A Bitmap index.

Description : Compare and contrast TRUNCATE and DELETE for a table.

Last Answer : Both the truncate and delete command have the desired outcome of getting rid of all the rows in a table. The difference between the two is that the truncate command is a DDL operation and just ... other hand, is a DML operation, which will produce a rollback and thus take longer to complete.

Description : Give two examples of how you might determine the structure of the table DEPT.

Last Answer : Use the describe command or use the dbms_metadata.get_ddl package.

Description : How many columns can table have?

Last Answer : The number of columns in a table can range from 1 to 254.

Description : Deleting the Duplicate rows in the table

Last Answer : We can delete the duplicate rows in the table by using the Rowid

Description : Suppose a customer table is having different columns like customer no, payments.What will be the query to select top three max payments?

Last Answer : SELECT customer_no, payments from customer C1 WHERE 3

Description : Find out nth highest salary from emp table?

Last Answer : SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal

Description : maxvalue.sql Select the Nth Highest value from a table?

Last Answer : select level, max('col_name') from my_table where level = '&n' connect by prior ('col_name') > 'col_name') group by level; Example: Given a table called emp with the following columns: -- id number -- name ... , max(sal) from emp -- where level=2 -- connect by prior sal > sal -- group by level

Description : What are the data types allowed in a table ?

Last Answer : CHAR,VARCHAR2,NUMBER,DATE,RAW,LONG and LONG RAW.

Description : If a View on a single base table is manipulated will the changes be reflected on the base table ?

Last Answer : If changes are made to the tables which are base tables of a view will the changes be reference on the view.

Description : How many LONG columns are allowed in a table ? Is it possible to use LONG columns in WHERE clause or ORDER BY ?

Last Answer : Only one LONG columns is allowed. It is not possible to use LONG column in WHERE or ORDER BY clause.

Description : What is the fastest way of accessing a row in a table ?

Last Answer : Using ROWID.CONSTRAINTS

Description : How do you find the numbert of rows in a Table ?

Last Answer : A bad answer is count them (SELECT COUNT(*) FROM table_name) A good answer is :- 'By generating SQL to ANALYZE TABLE table_name COUNT STATISTICS by querying Oracle System Catalogues (e.g ... utility which Oracle released which makes it unnecessary to do ANALYZE TABLE for each Table individually.