barcode reader code in asp.net c# Backup Strategies in Microsoft Office

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Backup Strategies
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Backing up databases is critical to preventing catastrophic data loss With Access, the primary strategy is to back up the file to another location With Office 2003, Microsoft added a new backup feature where the database can be backed up from the GUI interface It effectively closes the database and then creates a file copy of the database:
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CHAPTER 11: Managing Access Databases
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This is useful if you are in the middle of making major changes and want to save a copy before the changes are made IT can be done in one step, without closing Access or going out to the file system From a production standpoint, it is important that Access databases are backed up frequently if they are not on some type of failover hard drive system (eg, RAID) As with all backups, they should be taken offsite for safekeeping Often, IT operations (especially in larger companies) will not focus on backing up Access data, but data is data, and data loss is painful no matter what! Even with nightly or more frequent backups, there is still the chance that data will be lost between backups To minimize data loss with Access, replication is required to capture all transactions to a second location (we will be discussing replication later in the chapter) In short, it is important to have a well-planned backup strategy and ensure that the potential for data loss is kept to acceptable levels and well understood
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Database Security
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Another critical aspect of managing Access databases is security There are several levels of security that can be implemented in Access Each should be carefully reviewed to ensure that the proper level is implemented and supported
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Password and Encryption Security
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The first level of security is a database-level password along with data encryption/ decryption With the password security, the database cannot be opened without the password being entered The password itself is stored in the database in an encrypted format To set the password, click the Tools menu and then the Security option On the Security submenu, click the Set Database Password option The dialog box shown next pops up to prompt for the password and verification entry of the password
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If you do not have the database open for exclusive access, you will get a dialog box indicating it needs to be opened exclusively Follow the instructions in the dialog box to open the database exclusively
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Microsoft Office Access 2003 Professional Results
Once the password is entered, subsequent attempts to open the database will require the password to be entered In addition to password protection, we can also encrypt the database While the encryption is not key based, it does limit which non-Access utilities can easily read the contents of the MDB file Combined with the password protection, these two techniques provide for a reasonably robust and simple security implementation The problem is that they limit the granularity of the security to database objects and may limit what you can do with the database (such as replication) These techniques are especially useful for databases that are utilized by a limited number of people who need full access to the system One simple way to hide the structure of the database is to hide database objects Right-click on any object and go to Properties On the Properties dialog box, check the Hidden attribute
These techniques provide some fairly simple and straightforward methods for securing Access data These techniques can be useful when working with prototype databases, single-user systems, and other limited-use databases
User-Level Security
The second major type of security is user-level security This allows much more granularity of security levels by user When the users start Microsoft Access, they enter their username and password Users can be placed into defined groups, and security permissions can be defined at the group level
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