CS848: Topics in Databases: Foundations of Query Optimization Review  SQL the programming language  Applications in information systems  SQL technology.

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Presentation transcript:

CS848: Topics in Databases: Foundations of Query Optimization Review  SQL the programming language  Applications in information systems  SQL technology issues  SQL language issues

CS848: Topics in Databases: Foundations of Query Optimization Language for Information Retrieval DatabaseL?User  L must be approximated by L' PersonSet of Books Set of array of char  precision/recall/relevance(L')

CS848: Topics in Databases: Foundations of Query Optimization Language for Programming DatabaseL?User  L can be perfect  precision/recall/relevance not relevant CompilerSymbol Table

CS848: Topics in Databases: Foundations of Query Optimization Review  SQL the programming language  Applications in information systems  SQL technology issues  SQL language issues

CS848: Topics in Databases: Foundations of Query Optimization Information System (early days) SS2 SS3 SS1 File System DML Database (File System DDL)

CS848: Topics in Databases: Foundations of Query Optimization Introduction of SQL: Ted Codd, … SS2 SS3 SS1 SQL DML Database (SQL DDL) 1.Physical data independence 2.Quantification 3.Transactions and serializability

CS848: Topics in Databases: Foundations of Query Optimization Introduction of SQL Technology SS2 SS3 SS1 Database (SQL DDL) SQL DML 1.Physical data independence 2.Quantification 3.Transactions and serializability File System DML Database (File System DDL) DBMS

CS848: Topics in Databases: Foundations of Query Optimization Cost Savings SQLC (code size) SQLC (code size) (desirable)

CS848: Topics in Databases: Foundations of Query Optimization Evolution of SQL  Richer DDL E.g.: constraints, views, inheritance, users, permissions  Richer DML E.g.: nulls, bags, aggregation, ordering, view update, isolation levels

CS848: Topics in Databases: Foundations of Query Optimization Evolution of Technology SS2 SS3 SS1 Database (SQL DDL) SQL DML File System DML Database (File System DDL) DBMS DBMS1 DBMS2 (information integration: exact answers)

CS848: Topics in Databases: Foundations of Query Optimization Introduction of Main Memory Technology SS2 SS3 SS1 Database (SQL DDL) SQL DML + sync Database (C library DDL) DBMS Custom API Embedded Software System

CS848: Topics in Databases: Foundations of Query Optimization Database (SQL DDL) Introduction of Compilation SS2 SS3 SS1 SQL DML + sync Database (C library DDL) DBMS Custom API Embedded Software System (C library DML )

CS848: Topics in Databases: Foundations of Query Optimization Final Evolution of Technology SS2 SS3 SS1 Database (SQL DDL) SQL DML File System DML Database (File System DDL) DBMS DBMS1 DBMS2 (information integration: exact answers) Database (C type DDL) C type DML

CS848: Topics in Databases: Foundations of Query Optimization Cost Savings SQLC (code size) SQLC (code size) (desirable)

CS848: Topics in Databases: Foundations of Query Optimization Review  SQL the programming language  Applications in information systems  SQL technology issues  SQL language issues

CS848: Topics in Databases: Foundations of Query Optimization Performance: Need for Compilation SS2 SS3 SS1 Database (SQL DDL) SQL DML File System DML Database (File System DDL) DBMS DBMS1 DBMS2 Database (C type DDL) C type DML

CS848: Topics in Databases: Foundations of Query Optimization Step 1: Use Current Technology SS2 SS3 SS1 Database (SQL DDL) SQL DML File System DML Database (File System DDL) DBMS3 DBMS1 DBMS2

CS848: Topics in Databases: Foundations of Query Optimization Step 2: Specify Control Program SS2 SS3 SS1 Database (SQL DDL) SQL DML Database (C type DDL) DBMS DBMS3 C type DML

CS848: Topics in Databases: Foundations of Query Optimization Result of Compilation NewSS2 NewSS3 NewSS1 DBMS3 SQL DML Database (C type DDL) C type DML Control Program (a runtime reference architecture)

CS848: Topics in Databases: Foundations of Query Optimization Technology Issues in Physical Design  Tuple identification  Field layout  Indexing: arrays, stacks, heaps, … † † See, e.g., Knuth, volume 3.

CS848: Topics in Databases: Foundations of Query Optimization Technology Issues in Query Optimization  Pointers and arrays  Pipelined query plans  Code and data inlining  Semantic query optimization  Timing requirements Competition: What expert C programmers can do in coding to the runtime reference architecture!

CS848: Topics in Databases: Foundations of Query Optimization Review  SQL the programming language  Applications in information systems  SQL technology issues  SQL language issues

CS848: Topics in Databases: Foundations of Query Optimization Language Issues in Static Constraints  OWL!

CS848: Topics in Databases: Foundations of Query Optimization Language Issues in Dynamic Constraints  CTL!