CS 579 Database Systems
... The Distributed Commit Problem • A distributed transaction which executes at multiple sites must either be committed at all sites or aborted at all sites • Not acceptable for one sub-transaction to commit and one abort. • If the coordinator just sends a COMMIT message to two subordinates S1 and S2 ...
... The Distributed Commit Problem • A distributed transaction which executes at multiple sites must either be committed at all sites or aborted at all sites • Not acceptable for one sub-transaction to commit and one abort. • If the coordinator just sends a COMMIT message to two subordinates S1 and S2 ...
Bulk-loading
... Creation of a DW and running OLAP operations on them ( Roll up, Drill down, Slice,Dice, pivot) ...
... Creation of a DW and running OLAP operations on them ( Roll up, Drill down, Slice,Dice, pivot) ...
Advanced Database Systems
... This chapter provides a general overview, but at the same time covers some aspect that we did not see in class. Check slides and read: Sec 8.2.1. Sec 8.2.2. Sec 8.3 Sec 8.4: Although not covered in class, this section gives a good intuition of “thinking in I/O’s” when considering simple database ope ...
... This chapter provides a general overview, but at the same time covers some aspect that we did not see in class. Check slides and read: Sec 8.2.1. Sec 8.2.2. Sec 8.3 Sec 8.4: Although not covered in class, this section gives a good intuition of “thinking in I/O’s” when considering simple database ope ...
w03_1_INF280_Relational_Model
... • Null – Represents a value for an attribute that is currently unknown or is not applicable for this tuple. – Deals with incomplete or exceptional data. – Null represents the absence of a value and is not the same as zero or spaces, which are values. ...
... • Null – Represents a value for an attribute that is currently unknown or is not applicable for this tuple. – Deals with incomplete or exceptional data. – Null represents the absence of a value and is not the same as zero or spaces, which are values. ...
SQL standard published_POST
... JSON Objects consist of tags and data. For some applications, they provide a great deal of flexibility. SQL:2016 provides support to: ...
... JSON Objects consist of tags and data. For some applications, they provide a great deal of flexibility. SQL:2016 provides support to: ...
When to use Oracle Database In
... is to accelerate column-oriented data accesses made by analytics operations. It is similar in spirit to having a conventional index (for analytics) on every column in a table. However, it is much more lightweight than a conventional index, requiring no logging, or any writes to the database. Just as ...
... is to accelerate column-oriented data accesses made by analytics operations. It is similar in spirit to having a conventional index (for analytics) on every column in a table. However, it is much more lightweight than a conventional index, requiring no logging, or any writes to the database. Just as ...
PYTHIA-II: A Knowledge/Database System for Managing
... Additional Key Words and Phrases: Data mining, inductive logic programming, knowledgebased systems, knowledge discovery in databases, performance evaluation, recommender systems, scientific software ...
... Additional Key Words and Phrases: Data mining, inductive logic programming, knowledgebased systems, knowledge discovery in databases, performance evaluation, recommender systems, scientific software ...
Lecture 2 for Chapter 6, System Design
... arbitrary number of threads to handle an arbitrary number of input channels. A thread can be viewed as concurrent operations, each responding to a different event. If a thread needs additional data, it waits for input from a specific actor. ...
... arbitrary number of threads to handle an arbitrary number of input channels. A thread can be viewed as concurrent operations, each responding to a different event. If a thread needs additional data, it waits for input from a specific actor. ...
Paper "D2R MAP - A Database to RDF Mapping Language"
... specific ClassMap. Then the class instances are created and assigned a URI or a blank node identifier. Finally, the instance properties are created using datatype and object property bridges. The division between step three and four allows references to blank nodes within the model and to instances ...
... specific ClassMap. Then the class instances are created and assigned a URI or a blank node identifier. Finally, the instance properties are created using datatype and object property bridges. The division between step three and four allows references to blank nodes within the model and to instances ...
while new - UHasselt
... • Intuition: In whilenew you cannot make arbitrary choices (recall consistency criterion) Instead of choosing one successor relation, we must work with them all. • whilenew-PTIME: class of whilenew-PSPACEprograms running in polynomial time. ...
... • Intuition: In whilenew you cannot make arbitrary choices (recall consistency criterion) Instead of choosing one successor relation, we must work with them all. • whilenew-PTIME: class of whilenew-PSPACEprograms running in polynomial time. ...
resources_profiles_sessions_wlcg2008-1 - Indico
... pga_aggregate_target parameter: Specifies the target aggregate PGA memory available to all server processes attached to the instance Sessions parameter: Define number of session the an oracle instance can establish at the same time. When this parameter is not specifically defined in the parameter fi ...
... pga_aggregate_target parameter: Specifies the target aggregate PGA memory available to all server processes attached to the instance Sessions parameter: Define number of session the an oracle instance can establish at the same time. When this parameter is not specifically defined in the parameter fi ...
Databases - Course Introduction
... Non-Clustered Indexes Useful for fast retrieving a single record or a range of records Maintained in a separate structure in the DB Tend to be much narrower than the base table Can locate the exact record(s) with less I/O ...
... Non-Clustered Indexes Useful for fast retrieving a single record or a range of records Maintained in a separate structure in the DB Tend to be much narrower than the base table Can locate the exact record(s) with less I/O ...
Document
... Prepared statements, cont. Can dramatically improve performance Can call the set method as many times as you like ...
... Prepared statements, cont. Can dramatically improve performance Can call the set method as many times as you like ...
TrendWorX32 Logger – Data Logging to MS SQL Server
... 14. Click “Next” and “Finish”. A confirmation window will display. Test the data source connection if you wish by clicking the “Test Data Source” button. Click “OK” when you are done testing. 15. You should now be back in the Select Data Source window. Make sure that the data source that you have ju ...
... 14. Click “Next” and “Finish”. A confirmation window will display. Test the data source connection if you wish by clicking the “Test Data Source” button. Click “OK” when you are done testing. 15. You should now be back in the Select Data Source window. Make sure that the data source that you have ju ...
Database Programming With Java & JDBC
... String row_buffer = ""; for (int i=1; i<=num_columns; i++) { row_buffer += row_buffer + " " + rs.getString(i); ...
... String row_buffer = ""; for (int i=1; i<=num_columns; i++) { row_buffer += row_buffer + " " + rs.getString(i); ...
The SQL Query Language DML The SQL Query Language DML
... carried out by an application, to which we wish to allocate particular characteristics of reliability and isolation A system that makes available mechanisms for the definition and execution of transactions is called a transaction processing system Transactions are initiated with any SQL statemen ...
... carried out by an application, to which we wish to allocate particular characteristics of reliability and isolation A system that makes available mechanisms for the definition and execution of transactions is called a transaction processing system Transactions are initiated with any SQL statemen ...
database
... ◦ Information systems with poor reputations become serious burdens to the organizations that use them. ...
... ◦ Information systems with poor reputations become serious burdens to the organizations that use them. ...
designing database(updated)
... The procedure for representing relationships depends on both the degree of the relationship – unary, binary, ternary – and the cardinalities of the relationship. Binary 1:N Relationship: is represented by adding the primary key attribute (or attributes) of the entity on the one side of the relations ...
... The procedure for representing relationships depends on both the degree of the relationship – unary, binary, ternary – and the cardinalities of the relationship. Binary 1:N Relationship: is represented by adding the primary key attribute (or attributes) of the entity on the one side of the relations ...
Introduction to Relational Database Systems
... • Most modern database systems follow the relational model • Relations are sets of tuples that specify relationships between values • Each relation has a schema specifying the attributes, and each attribute’s domain of valid values • Candidate keys and foreign keys further constrain the valid tuples ...
... • Most modern database systems follow the relational model • Relations are sets of tuples that specify relationships between values • Each relation has a schema specifying the attributes, and each attribute’s domain of valid values • Candidate keys and foreign keys further constrain the valid tuples ...
Databases 101 Matthew J. Graham CACR Methods of Computational Science
... By definition, a database transaction must be: Atomic: all or nothing Consistent: no integrity constraints violated Isolated: does not interfere with any other transaction Durable: persist matthew graham ...
... By definition, a database transaction must be: Atomic: all or nothing Consistent: no integrity constraints violated Isolated: does not interfere with any other transaction Durable: persist matthew graham ...