Wednesday, August 1, 2007

j4stored procedures -- a sybase perspective

There are many advantages to using stored procedures (unfortunately in Sybase they do not handle the text/image types):

    • 1) Modularity (%% #1 OO design principle: isolate changes => reduce impact, reduce regression test, unit test && dependency injection %%) - during application development, the application designer can concentrate on the front-end and the DB designer can concentrate on the ASE.
    • 2) Security (%% consider views %%) - you can revoke access to the base tables and only allow users to access and manipulate the data via the stored procedures.
    • 4) Minimise blocks and deadlocks - it is a lot easier to handle a deadlock if the entire transaction is performed in one database request, also locks will be held for a shorter time, improving concurrency and potentially reducing the number of deadlocks. Further, it is easier to ensure that all tables are accessed in a consistent order (%% 1 of 4 deadlock conditions %%) if code is stored centrally rather than dispersed among a number of apps.
    • 4.1) %% In zed I used to do mass delete and mass update, which held the lock forever. Cursor is more "nice" (unix jargon), locking and releasing a subset of rows (or just 1) at a time. Less contention and less deadlocking. %%
    • 3) Performance - stored procedures are parsed and a query plan is compiled. This information is stored in the system tables and it only has to be done once.
    • Network - if you have users who are on a WAN (slow connection) having stored procedures will improve throughput because less bytes (%% ? %%) need to flow down the wire from the client to ASE.

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