Microsoft SQL Server 2012 管理 (2): 实例与数据库管理

1.加密数据库

/*
Module 2 Implementing Transparent Data Encryption
*/

-- 2.1 Create DataBase Master Key
USE Master;
GO

Create Master Key Encryption By Password='SuperKey@currentMachine'
-- The password above must adhere to the windows password policy
-- could also use a hardware encryption module.

-- 2.2 Create a Srever Certificate Derived from Database Master Key
USE master;
GO

Create Certificate TDE_Cert with subject='TDE_Encryption_Cert'

-- 2.3 Create Database Encryption key for a User Database
USE TinyDB
GO

Create Database Encryption Key with Algorithm=AES_256
Encryption by Server Certificate TDE_Cert
-- The are other algorithm choices but AES_256 is the STRONGEST

-- 2.4 Protect User Database
USE TinyDB
GO

Alter Database TinyDB
Set ENCRYPTION ON

-- 2.5 FollowUp
/*
Back up all keys in the hierarchy to a safe place
In practice TEST moving/restoring the database to another instance.
*/

 2. 压缩数据

/*
Implementing Data Compression
*/

Create Database DBWithRedundantData
GO

USE DBWithRedundantData
GO

--Create a Table Assigning Row Compression

Create Table GreatForRowCompression
(
Col1 int
,Col2 char(5)
,Col3 char(3)
,Col4 char(2)
) WITH (DATA_Compression=ROW)

--Create a Table Assigning Page Compression

Create Table GreatForPageCompression
(
Col1 int
,Col2 char(5)
,Col3 char(3)
,Col4 char(2)
) WITH (DATA_Compression=PAGE)

/*
Keep in mind ALTER TABLE and ALTER INDEX can be used 
to implement compression when those obects already exist.
*/

3. 数据库可用性

/*
Change various database option and refresh the Mgmt
*/

-- 2.1 Setup: Add a Table and a couple of rows.
USE TinyDB;
GO

Create Table dbo.T1 (Col1 int Identity, COl2 Varchar(20) default 'T1')
Insert T1 default values
GO 5

-- 2.2 Chnage Avalablity options
Alter database TinyDB
    Set OFFLINE
    -- The Database is Absolutely inaccessible
    --Cleanly shus down the database without having to DETACH
    --Refresh the Databasees node in Mgmt Studio to notice the change

    --Try this query to see what happens... Select * from T1

Alter database TinyDB
    Set EMERGENCY
    -- limited access (Only SysAdmins). This might be useful for 
    -- Transaction Log repairs with DBCC.
        --Try this query to see what happens... Select * from T1

Alter database TinyDB
    Set ONLINE -- The Default Option

Alter database TinyDB
    Set READ_ONLY
    -- Cannot make changes to the database

    -- Try this query to see what happens... UPDATA T1 set Col2='dd' where Col1=1

Alter database TinyDB
    Set READ_WRITE -- the Default Option

Alter database TinyDB
    Set SINGLE_USER
    -- Only one authoritative user can connect to the database
    -- Userd when DBCC CheckD repair_allow_data_loss is used

Alter database TinyDB
    Set RESTRICTED_USER

Alter database TinyDB
    Set MULTI_USER -- the Default Option