todearmurali

 Profile Answers by todearmurali Questions by todearmurali

• Sep 27th, 2005

To avoid row migration from future updates to the block pctfree is set.

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balakrishna

• Oct 8th, 2005

These r the extents which indicates data was not stored in the segment.

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balakrishna

• Oct 8th, 2005

Depends upon the storage parameters.

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balakrishna

• Oct 8th, 2005

To avoid the space wastage we use OPTIMAL parameter.

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balakrishna

• Oct 8th, 2005

Create rollback segment roll1tablespace roll1;

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balakrishna

• Oct 8th, 2005

By correctly fixing optimal size

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balu

• Oct 8th, 2005

By using dictionaray view's called v$rollstat,dba_rollback_segs.

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balu

• Oct 8th, 2005

By specifying the storage clause while creating table.

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balu

• Oct 8th, 2005

LGWR process wirtes all change vectors from theredo log buffer to online redo log file sequentially.

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balu

• Oct 8th, 2005

When ever changes happend to the database previous change will be there in the rollback segment.

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sandeep vig

• Oct 13th, 2005

there are main two causes for reparsing1)the objects which the query is refrencing has been modified 2) or the parsed version of sql text has been aged out of the library cache.

praim Sankar

• Sep 1st, 2005

The Library Cache was introduced because parsing (and validating and checking privileges) is expensive in terms of CPU cycles.   Oracle uses a LRU/MRU mechanism to keep sql statements in cac...

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Ravi Prakash Pichika

• Jun 6th, 2005

SGA - Stands for System Global Area, its a part of Memory structure! SGA consists of   Shared Pool Database Buffer Cache Redo Log Buffer Lock & Latch Management  & M...

nishit patel

• Mar 12th, 2005

SGA * stands for System/Shared Global Area* can be used/shared by all users* it is a part of memory structure of Instance* consists of memory components like 1> shared pool 2> Database cache 3...

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Srikanth

• Dec 14th, 2005

Due to syntax errors

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 It  is  the  set  of  before  image  data blocks that contain rows that are modified by a transaction.Each   Rollback  Segment  entry  must  be  completed  within   one rollback segment. A single rollback segment can have multiple rollback segment entries.

samiksc

 Profile Answers by samiksc Questions by samiksc

• Dec 29th, 2005

A rollback segment entry consists of image of pre-update value, block address, data file number, transaction ID and transaction status (active or committed). A single rollback segment may contain several rollback entries and several active transactions.

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 Rollback  segment  dynamically  extent  to handle larger transactions entry loads. A  single  transaction may wipeout all available free space in the Rollback Segment Tablespace. This prevents other user using Rollback segments.

Guest

• Dec 29th, 2005

A select query may fail with a 'snapshot too old' error in the following situation:A user issues a long running select query.Another user starts a transaction which updates the same table used in the ...

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 Querying the DBA_ROLLBACK_SEGS viewIN USE         - Rollback Segment is on-line.AVAILABLE - Rollback Segment available but not on-line.OFF-LINE  - Rollback Segment off-lineINVALID        - Rollback Segment Dropped.NEEDS RECOVERY  - Contains data but need recovery or corupted.PARTLY  AVAILABLE  - Contains...

samiksc

 Profile Answers by samiksc Questions by samiksc

• Dec 29th, 2005

The following views help in monitoring rollback segment usage: DBA_SEGMENTSDBA_ROLLBACK_SEGSV$ROLLNAMEV$ROLLSTATV$TRANSACTION

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 Create  a  database which implicitly creates a SYSTEM Rollback Segment in a SYSTEM tablespace. Create a Second Rollback Segment name R0  in the SYSTEM tablespace. Make  new  rollback segment available (After shutdown, modify init.ora file and Start database) Create other tablespaces (RBS)  for rollback segments. Deactivate  Rollback ...

samiksc

 Profile Answers by samiksc Questions by samiksc

• Dec 29th, 2005

Create rollback segment by using command likecreate rollback segment rbs01 tablespace tbs1 storage (initial 1M next 1M optimal 5M minextents 20 maxextents 100)Edit the database initialization file to ...

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      - Logical Backups     - Cold Backups     - Hot Backups (Archive log)

cmanne

 Profile Answers by cmanne Questions by cmanne

• Jan 4th, 2006

1. Physical Backup---Hot Backup---Cold Backup2. Logical Backup---Export---Import

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 Full back      - Complete databaseIncremental          - Only affected tables from last incremental date/full backup date.Cumulative backup - Only affected table from the last cumulative date/full backup date.

cmanne

 Profile Answers by cmanne Questions by cmanne

• Jan 4th, 2006

Different kinds of Exports are:1. Owner(Schema) level Backup2. Object(table) level backup3. Full Backup4. Tablespace Level Backup

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 Taking backup of archive log files when database is open. For this the ARCHIVELOG mode should be enabled. The following files need to be backed up. All data files. All Archive log, redo log files. All control files.

cmanne

 Profile Answers by cmanne Questions by cmanne

• Jan 4th, 2006

The database should be in Archive log mode to take hot backups.Step1: Shutdown the database gracefullyStep2: Take full backup of the databaseStep3: Edit the following intialization parameters likelog_...

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