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1.
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What are the steps involved in Database Startup ? |
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Start an instance, Mount the Database and Open the
Database.
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2.
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What are the steps involved in Database Shutdown? |
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Close the Database; Dismount the Database and Shutdown
the Instance.
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3.
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What is Restricted Mode of Instance Startup ? |
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An instance can be started in (or later altered to be
in) restricted mode so that when the database is open
connections are limited only to those whose user
accounts have been granted the RESTRICTED SESSION system
privilege.
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4.
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What are the different modes of mounting a Database with
the Parallel Server? |
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Exclusive Mode If the first instance that mounts a
database does so in exclusive mode, only that Instance
can mount the database.
Parallel Mode if the first instance that mounts a
database is started in parallel mode, other instances
that are started in parallel mode can also mount the
database.
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5.
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What is full backup? |
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A full backup is an operating system backup of all data
files, on-line redo log files and control file that
constitute ORACLE database and the parameter. |
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6.
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Can Full Backup be performed when the database is open? |
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No.
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7.
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What is Partial Backup? |
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A Partial Backup is any operating system backup short of
a full backup, taken while the database is open or shut
down.
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8.
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What Is On-lineRedoLog? |
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The On-line Redo Log is a set of tow or more on-line
redo files that record all committed changes made to the
database. Whenever a transaction is committed, the
corresponding redo entries temporarily stores in redo
log buffers of the SGA are written to an on-line redo
log file by the background process LGWR. The on-line
redo log files are used in cyclical fashion.
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9.
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What is Mirrored on-line Redo Log? |
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A mirrored on-line redo log consists of copies of
on-line redo log files physically located on separate
disks; changes made to one member of the group are made
to all members.
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10. |
What is Archived Redo Log? |
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Archived Redo Log consists of Redo Log files that have
archived before being reused.
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11. |
What are the advantages of operating a database in
ARCHIVELOG mode over operating it in NO ARCHIVELOG mode? |
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Complete database recovery from disk failure is possible
only in ARCHIVELOG mode.
Online database backup is possible only in ARCHIVELOG
mode.
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12. |
What is Log Switch? |
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The point at which ORACLE ends writing to one online
redo log file and begins writing to another is called a
log switch.
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13. |
What are the steps involved in Instance Recovery? |
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Rolling forward to recover data that has not been
recorded in data files, yet has been recorded in the
on-line redo log, including the contents of rollback
segments.
Rolling back transactions that have been explicitly
rolled back or have not been committed as indicated by
the rollback segments regenerated in step a.
Releasing any resources (locks) held by transactions in
process at the time of the failure.
Resolving any pending distributed transactions
undergoing a two-phase commit at the time of the
instance failure. |
