Query Optimization In Compressed Database Systems.
... rates by orders of magnitude, enabling the use of data compression techniques to improve the performance of database systems. Previous work describes the benefits of compression for numerical attributes, where data is stored in compressed format on disk. Despite the abundance of stringvalued attribut ...
... rates by orders of magnitude, enabling the use of data compression techniques to improve the performance of database systems. Previous work describes the benefits of compression for numerical attributes, where data is stored in compressed format on disk. Despite the abundance of stringvalued attribut ...
ppt
... • A ResultSet maintains a cursor pointing to its current row of data • The 'next' method moves the cursor to the next row – you can’t rewind ...
... • A ResultSet maintains a cursor pointing to its current row of data • The 'next' method moves the cursor to the next row – you can’t rewind ...
Database Systems - University of Texas at Dallas
... • Basic constraints: – Key and referential integrity constraints (Referential Integrity means that the foreign key in one table refers to something that actually exists as a primary key in another table) – Restrictions on attribute domains and NULLs – Constraints on individual tuples within a relati ...
... • Basic constraints: – Key and referential integrity constraints (Referential Integrity means that the foreign key in one table refers to something that actually exists as a primary key in another table) – Restrictions on attribute domains and NULLs – Constraints on individual tuples within a relati ...
grant select on
... Each position M(i,j) in the matrix represents the types of privileges (read, write, update) that subject i holds on object j. ...
... Each position M(i,j) in the matrix represents the types of privileges (read, write, update) that subject i holds on object j. ...
Database Operations
... • Semi-linear queries – Defined as linear combination of attribute values compared against a constant – Linear combination is computed as a dot product of two vectors – Utilize the vector processing capabilities of GPUs ...
... • Semi-linear queries – Defined as linear combination of attribute values compared against a constant – Linear combination is computed as a dot product of two vectors – Utilize the vector processing capabilities of GPUs ...
Fast Numerical Computations on Large Integer Databases using
... • Semi-linear queries – Defined as linear combination of attribute values compared against a constant – Linear combination is computed as a dot product of two vectors – Utilize the vector processing capabilities of GPUs ...
... • Semi-linear queries – Defined as linear combination of attribute values compared against a constant – Linear combination is computed as a dot product of two vectors – Utilize the vector processing capabilities of GPUs ...
6 ER2RDM_Mapping
... Rule to Follow: Database tables should contain no noise. Database Principles ...
... Rule to Follow: Database tables should contain no noise. Database Principles ...
ppt (final)
... %TYPE attribute • %TYPE attribute is used when a PL/SQL variable is going to be used to manipulate the data stored in the database. • The variable should have the same type as the table column (field). • Specifying %TYPE attribute takes care. ...
... %TYPE attribute • %TYPE attribute is used when a PL/SQL variable is going to be used to manipulate the data stored in the database. • The variable should have the same type as the table column (field). • Specifying %TYPE attribute takes care. ...
CHAPTER 10 More Complex Business Rules
... CompareValidator). Unlike the CompareValidator though, a ListValidator looks at all rows in the query result. The example below uses a SQL statement to require the Employees JobId attribute match a JOB_ID in the JOBS table. ...
... CompareValidator). Unlike the CompareValidator though, a ListValidator looks at all rows in the query result. The example below uses a SQL statement to require the Employees JobId attribute match a JOB_ID in the JOBS table. ...
Create All Those Tables and Call PROC SQL Once!
... Disconnect from database(method-dependent) Quit; ONLY: (combines all three above) ...
... Disconnect from database(method-dependent) Quit; ONLY: (combines all three above) ...
Transactions, Views, Indexes
... If a transaction T is SERIALIZABLE, then it reads only changes made ...
... If a transaction T is SERIALIZABLE, then it reads only changes made ...
Lecture notes
... The class mailing list cs145-aut0708students is in effect a materialized view of the class enrollment in Axess. ...
... The class mailing list cs145-aut0708students is in effect a materialized view of the class enrollment in Axess. ...
Analysis of SQL injection prevention using a proxy server
... parameters of a Web-based application are modified in order to change the SQL statements that are passed to a database. • An attacker is able to insert a series of SQL statements into a 'query' by manipulating data input. ...
... parameters of a Web-based application are modified in order to change the SQL statements that are passed to a database. • An attacker is able to insert a series of SQL statements into a 'query' by manipulating data input. ...
Temporal Relational Calculus
... where RjDB is the interpretation of the predicate symbol Rj in the database DB. The answer to a query Q over DB is the set Q(DB) of valuations that make Q true in DB. Namely, Q(DB) := {θ|F V (Q) : DB, θ |= Q} where θ|F V (Q) is the restriction of the valuation θ to the free variables of Q. In many c ...
... where RjDB is the interpretation of the predicate symbol Rj in the database DB. The answer to a query Q over DB is the set Q(DB) of valuations that make Q true in DB. Namely, Q(DB) := {θ|F V (Q) : DB, θ |= Q} where θ|F V (Q) is the restriction of the valuation θ to the free variables of Q. In many c ...
FOREIGN KEY
... department or manage another employee. 2) Return the employees who manage an employee but do not manage a department. ...
... department or manage another employee. 2) Return the employees who manage an employee but do not manage a department. ...
Databases and Natural Language Interfaces
... videos, …) to clarify the answer, to make it more pleasant, or to complete it. If, for example, the reply includes an address, a presentation similar to the one used in postcards will certainly be appreciated. 2 System Architecture The system’s architecture (see Figure 1) is based on an Intermediate ...
... videos, …) to clarify the answer, to make it more pleasant, or to complete it. If, for example, the reply includes an address, a presentation similar to the one used in postcards will certainly be appreciated. 2 System Architecture The system’s architecture (see Figure 1) is based on an Intermediate ...
CSc-340 04a
... JDBC supports a variety of features for querying and updating data, and for retrieving query results. JDBC also supports metadata retrieval, such as querying about relations present in the database and the names and types of relation attributes. Model for communicating with the database: ...
... JDBC supports a variety of features for querying and updating data, and for retrieving query results. JDBC also supports metadata retrieval, such as querying about relations present in the database and the names and types of relation attributes. Model for communicating with the database: ...
Logical Data Modelling
... Exploring the ‘definition’ of Relations. Identifying potential anomalies in a Table of data, and ‘solving’ these ‘problems’. Documenting a Database Schema (i.e. a Logical Model), in the format required by Part 2 of the Assignment. 44271: Database Design & Implementation: Logical Data Modelling ...
... Exploring the ‘definition’ of Relations. Identifying potential anomalies in a Table of data, and ‘solving’ these ‘problems’. Documenting a Database Schema (i.e. a Logical Model), in the format required by Part 2 of the Assignment. 44271: Database Design & Implementation: Logical Data Modelling ...
Chapter 4: Advanced SQL - United International College
... constraint. They test values inserted in the database, and test queries to ensure that the comparisons make sense. New domains can be created from existing data types ...
... constraint. They test values inserted in the database, and test queries to ensure that the comparisons make sense. New domains can be created from existing data types ...
Semantic Wrapper over Relational Databases
... LOCATION.east-UTM-in-key, NULL, NULL, NULL, NULL, NULL, NULL, IMAGE.* from LOCATION, IMAGE where time > '1993/01' and exists ( select * from FIXED-STATION where by-physical-observation-station-id = physical-observation-station-id-key and ...
... LOCATION.east-UTM-in-key, NULL, NULL, NULL, NULL, NULL, NULL, IMAGE.* from LOCATION, IMAGE where time > '1993/01' and exists ( select * from FIXED-STATION where by-physical-observation-station-id = physical-observation-station-id-key and ...
The Relational Model
... Also delete all Enrolled tuples that refer to it. Disallow deletion of a Students tuple that is referred to. Set sid in Enrolled tuples that refer to it to a default sid. (In SQL, also: Set sid in Enrolled tuples that refer to it to a special value null, denoting `unknown’ or `inapplicable’.) ...
... Also delete all Enrolled tuples that refer to it. Disallow deletion of a Students tuple that is referred to. Set sid in Enrolled tuples that refer to it to a default sid. (In SQL, also: Set sid in Enrolled tuples that refer to it to a special value null, denoting `unknown’ or `inapplicable’.) ...
database - GCG-42
... – (customer-id, account-number) is the super key of depositor – NOTE: this means a pair of entity sets can have at most one relationship in a particular relationship set. • E.g. if we wish to track all access-dates to each account by each customer, we cannot assume a relationship for each access. We ...
... – (customer-id, account-number) is the super key of depositor – NOTE: this means a pair of entity sets can have at most one relationship in a particular relationship set. • E.g. if we wish to track all access-dates to each account by each customer, we cannot assume a relationship for each access. We ...
SQL-DDL - Computer Science and Engineering
... – Open book and notes but no computer, cell phone, or other electronic devices ...
... – Open book and notes but no computer, cell phone, or other electronic devices ...
