Client server

The Client/Server Database Environment CS263 Lecture 12

Client/Server systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Three components of application logic ,[object Object],[object Object],[object Object]

Client/Server architectures ,[object Object],[object Object],[object Object],Client does extensive processing Client does little processing

File server architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Three problems with file server architecture ,[object Object],[object Object]

Three problems with file server architecture ,[object Object]

File Server Architecture FAT CLIENT

Database server architectures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Stored procedures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Stored procedures ,[object Object],[object Object],[object Object],[object Object]

Database server architecture Thinner clients DBMS only on server

Three-tier architectures ,[object Object],[object Object],[object Object],[object Object],[object Object]

Three-tier architecture Thinnest clients Business rules on separate server DBMS only on DB server

Advantages of three-tier architectures ,[object Object],[object Object],[object Object]

Challenges of three-tier architectures ,[object Object],[object Object],[object Object],[object Object]

Application partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Parallel computer architectures ,[object Object],[object Object],[object Object]

Query processing with parallel processors Parallel transactions Parallel query

Parallel computer architectures ,[object Object],[object Object],[object Object],[object Object]

Parallel Computer Architectures Tightly-coupled – CPUs share common memory space Loosely-coupled – CPUs each have their own memory space

Middleware ,[object Object],[object Object],[object Object],The “glue” that holds client/server applications together

Six types of middleware ,[object Object],[object Object],[object Object]

Database middleware ,[object Object],[object Object],[object Object],[object Object],[object Object]

Client/Server security ,[object Object],[object Object],[object Object],[object Object]

Database access from client applications ,[object Object],[object Object],[object Object]

Database access from client applications ,[object Object],[object Object],[object Object],[object Object]

Processing logic distributions a) 2-tier b) 3 and n -tier Processing logic could be at client, server, or both Processing logic will be at application server or Web server

Query-by-example (QBE) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Using ODBC to link external databases stored on a database server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Using ODBC to link external databases stored on a database server ,[object Object],[object Object],[object Object],[object Object],[object Object]

ODBC Architecture Each DBMS has its own ODBC-compliant driver Client does not need to know anything about the DBMS Application Program Interface (API) provides common interface to all DBMSs

Client server

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Client server