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¶ … Database Developer (based on job I worked on).
Syntax and Semantic Analysis
-- The Syntax errors involved misuse of keywords.
The Semantic errors involved misuse of columns and tables - there were incompatible data types.
To elaborate, the syntax refers to the structure of the program and syntactic analysis checks for errors in aspects like spelling or whether ibraces are missing in which case the program would fail syntactically.
Semantic errors, on the other hand refer to the essential meaning of the content -- whether it all makes sense and whether it is accurate (for instance writing "the sun rises in the west") is a semantic error for this is incorrect. I would have to ascertain that all data placed in tables and columns was accurate in both context and form.
b. Query Transformation
I transformed the query into simplified and standardized format based on relational algebra. Some query transformations need to be costed in order to be chosen and some not. For instance, if a table is eliminated totally from the join, then need to cost that consequent...
An access plan is a tree of decisions about file structures to perform query. The query optimizer chooses the access path based on which access paths are available for the statement as well as on the estimated cost of executing the statement, using each access path or using a combination of paths
Each operation in the plan has a cost formula that estimates the PRA and CPU operations.
C. Access Plan Evaluation
-- The query optimization component evaluated many access plans and the access plan with the lowest cost was selected. The optimizer first determined which access paths were available by examining the conditions in the statement's WHERE clause and its FROM clause. It then generated a set of possible execution plans using available access paths and estimating the cost of each plan, using the statistics for the index, columns, and tables accessible to the statement. Finally, it chose the execution plan with the lowest possible cost.
I instructed the optimizer…
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