Julián Castiblanco P.http://julycastiblanco.blogspot.com/

Julian_castiblancop@hotmail.com

MCT-MCITP-MCTS SQL Server 2008/2005

Líder ITPros-DC

SESIÓN 6- Security & Recovery

CONTENIDO DEL CURSO

CONTENIDO DEL CURSO

Seguridad

Server Role

SQL Server Login

Windows Group

Domain User Account

Local User Account

SQL Server

Database

Windows

Securables

Permissions

Principals

User

Database Role

Application Role

Qué es un Principal?

• Resources that can be secured

• Securables are contained within scopes

Server

Database

Schema

Qué son los objetos asegurables?

GRANT, REVOKE, DENY

• GRANT is used to assign a permission

• DENY is used to explicitly deny a permission

– Used where permissions inherited through group or role membership

– Should only be used in exceptional circumstances

• REVOKE removes either a GRANT or a DENY

Grant, Revoke, DENY?

Aseguramiento y Recuperación

Buffer Cache

Data pages are located in,

or read into, the buffer cache

and then modified2

Modification is recorded

in transaction log on disk3

Checkpoint writes

dirty pages

to database

4

Data modification is

sent by application1

Transaction logs provide a history of actions executed by a database management system to guarantee ACID properties

Cómo Funciona el log transaccional?

Backup Types Description

Full All data files and active part of the transaction log

Differential The parts of the database that have changed since the last full database backup

Partial The primary filegroup, every read/write filegroup, and any specified read-only filegroups

Transaction Log Any database changes recorded in the log files

Tail-log Backup Log backup taken of the tail of the log just before a restore operation

File/File Group Specified files or filegroups

Copy Only The database or log (without affecting the backup sequence)

Tipos de Backups?

Full Database Backups:

Backup all data and part of the log records

Can be used to restore the whole database

Permit recovery to backup times only

Sunday Monday Tuesday

Estrategia de Full Backup

BACKUP DATABASEAdventureWorks2008R2 TO DISK ='L:\SQLBackups\AW.bak'

WITH INIT;

• Backup entire database

• Backup active portion of log file

Como se genera un Full Backup

A Database and Transaction Log Backup Strategy:

Involves at least full and transaction log backups

Enables point in time recovery

Database can be fully restored in the case of data file loss

Sunday Monday

Estrategias de Log Back Up

BACKUP LOG AdventureWorks2008R2 TO DISK = 'L:\SQLBackups\AW_Log.bak'WITH NOINIT;

• Backup the transaction log only

• Backs up log from the last successfully executed log backup to the current end of the log

• Truncates inactive log records unless options specified

Note: Database must be in full or bulk-logged recovery model

Creación de un Log Back Up

A Differential Backup Strategy:

Involves performing full and differential database backups

Includes differential backups with only changed data

Is useful if only a subset of a database is modified more frequently than the rest of the database

Monday Tuesday

Estrategias de Backup Diferencial

BACKUP DATABASE AdventureWorks2008R2 TO DISK = 'L:\SQLBackups\AW_Diff.bak'WITH DIFFERENTIAL, INIT;

• Backup the extents changed since the last full database backup

• Store active part of the transaction log to be able to recover the database

• Independent of other differential backups

Note: You cannot create a differential database backup if no full backup has ever been created

Creación de Backup Diferencial