Database Storage Design

Advantage Database Server: The Official Guide by Cary Jensen

By Cary Jensen

This technically reviewed and ADS-endorsed source grants to-the-point info on utilizing advertisements to construct notable databases with remarkable balance, scalability, and function. learn how to install Advantage-enabled purposes as stand-alone, peer-to-peer, client/server, and web purposes with only one set of resource code. Plus-CD-ROM features a trial model of advertisements, in addition to the entire present database connectivity drivers, database administration instruments, and configuration instruments.

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If you want to view an encrypted free table using the Advantage Data Architect, you will be prompted for the password when you open the table. Similarly, before an encrypted table can be accessed from a client application, your code will be responsible for submitting the password. How you submit a table’s password from a client application depends on the data access mechanism you are using. For example, if you are using the ACE API, you must make a call to AdsEnableEncryption (for ADS tables) or AdsStmtSetTablePassword (for executing SQL statements against the table), passing the table name and the password as the arguments to the function call.

This discussion is not meant to suggest that you should avoid conditional indexes. Indeed, they are high-performance indexes with many valuable characteristics. However, there are alternatives. Which indexes 48 Chapter 3: Defining Indexes Chapter 3: Defining Indexes 49 and filtering mechanism are best for your application depends on the nature of your data and how you need to access it. Custom Indexes A custom index is an initially empty index whose keys are added at runtime. For example, you can have a custom index named ShowCustomers.

For example, if you have a unique index on the Customer ID field of an ADT table, an attempt to write another record to this table using the same customer ID value as one that already exists in the table will fail. Expression indexes are the workhorse indexes of your database applications. In fact, conditional, subindex, and custom index orders are really just special cases of expression indexes. In short, they provide you with ordered, high-speed access to your table’s records based on index key expressions.

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