Mobile Database Systems - Web Pages
... geographical region, each service provider divides their area into smaller segments called cells. Each of this cell has a Base Station. Ideally, the system has a large number of very small hexagons (cell). The greater the number of hexagons, the more simultaneous calls the system can handle. ...
... geographical region, each service provider divides their area into smaller segments called cells. Each of this cell has a Base Station. Ideally, the system has a large number of very small hexagons (cell). The greater the number of hexagons, the more simultaneous calls the system can handle. ...
Architecture of the Gracenote Service
... • A single server could be configured to load all necessary modules to perform as two or more types of server at once • In practice, this is not desirable since specialization increases performance and flexibility of control ...
... • A single server could be configured to load all necessary modules to perform as two or more types of server at once • In practice, this is not desirable since specialization increases performance and flexibility of control ...
Sort Heap - WordPress.com
... • Recovery and integrity considerations – Data and index must be recovered together ...
... • Recovery and integrity considerations – Data and index must be recovered together ...
Java Database Connectivity JDBC Architecture JDBC - CS
... • The same data can be organized in very different ways – When designing your DB and when deciding what your primary keys should be, always think about typical use cases and deduce from them which queries are most common and which queries must run fastest ...
... • The same data can be organized in very different ways – When designing your DB and when deciding what your primary keys should be, always think about typical use cases and deduce from them which queries are most common and which queries must run fastest ...
Advanced Database Techniques 2009
... – Tuple size (203 bytes) dictated by the page size – Relation size dictated by low memory, e.g. a 2 megabyte database was almost a complete disk • Redesign and scaling up – Relation size increased to 100K and beyond – Cyclic values -> random to generate more realistic distribution – Strings start wi ...
... – Tuple size (203 bytes) dictated by the page size – Relation size dictated by low memory, e.g. a 2 megabyte database was almost a complete disk • Redesign and scaling up – Relation size increased to 100K and beyond – Cyclic values -> random to generate more realistic distribution – Strings start wi ...
Enterprise console
... locking or waits in resources such as latches and data buffers SQL Statement Problem Identification – view long-running, high resource consuming, or short but frequently executed SQL statements SQL Statement Problem Analysis – see access path with detailed steps to track changes to execution pla ...
... locking or waits in resources such as latches and data buffers SQL Statement Problem Identification – view long-running, high resource consuming, or short but frequently executed SQL statements SQL Statement Problem Analysis – see access path with detailed steps to track changes to execution pla ...
CF and JSP/Servlets A Comparison
... Servlet HttpSession object <% HttpSession aSession = request.getSession(); aSession.setAttribute(“name”, “John Doe”); %> ...
... Servlet HttpSession object <% HttpSession aSession = request.getSession(); aSession.setAttribute(“name”, “John Doe”); %> ...
Improving high availability in WebSphere Commerce using DB2 HADR
... You can group resources together in TSA. Once grouped, all relationships among the members of the group are established, such as location relationships, start and stop relationships, and so on. ...
... You can group resources together in TSA. Once grouped, all relationships among the members of the group are established, such as location relationships, start and stop relationships, and so on. ...
Strategies and Techniques for Using Oracle7 Replication
... For each kind of activity you wish to replicate (“Row changes against Orders”, “Procedure calls for Batch Deletes”), you may choose a method to deliver it to remote locations: synchronously or asynchronously. Synchronous Replication. Also referred to as “real-time” replication, synchronous replicati ...
... For each kind of activity you wish to replicate (“Row changes against Orders”, “Procedure calls for Batch Deletes”), you may choose a method to deliver it to remote locations: synchronously or asynchronously. Synchronous Replication. Also referred to as “real-time” replication, synchronous replicati ...
Index A Guide to the Index
... increases Redo, 169 benchmarking benchmarking in isolation, 434 benchmarking to scale, 435 tuning, 434 BETWEEN windowing clause, 561 BFILE, 821 LOB_IO procedure, 824 reading file using, 393 BigDecimal type, Java passed from Oracle Number type Java stored procedures, 849 ...
... increases Redo, 169 benchmarking benchmarking in isolation, 434 benchmarking to scale, 435 tuning, 434 BETWEEN windowing clause, 561 BFILE, 821 LOB_IO procedure, 824 reading file using, 393 BigDecimal type, Java passed from Oracle Number type Java stored procedures, 849 ...
notes #13
... • List must be specified if there is any ambiguity in a column name. • The subselect is known as the defining query. • WITH CHECK OPTION ensures that if a row fails to satisfy WHERE clause of defining query, it is not added to underlying base table. • Need SELECT privilege on all tables referenced i ...
... • List must be specified if there is any ambiguity in a column name. • The subselect is known as the defining query. • WITH CHECK OPTION ensures that if a row fails to satisfy WHERE clause of defining query, it is not added to underlying base table. • Need SELECT privilege on all tables referenced i ...
MySQL 5.6 - Computer Science
... There are two wild-card characters used to specifiy patterns: _ matches a single character ...
... There are two wild-card characters used to specifiy patterns: _ matches a single character ...
TAMEX: a Task-Based Query Execution Framework for Mixed
... determine which records are visible to each transaction when multiple transactions run in parallel. TIDs issued by a transaction manager for each arriving query define the start order of transactions. See [Pla11] for more details. To achieve durability in case of a system failure, the IMDBMS writes ...
... determine which records are visible to each transaction when multiple transactions run in parallel. TIDs issued by a transaction manager for each arriving query define the start order of transactions. See [Pla11] for more details. To achieve durability in case of a system failure, the IMDBMS writes ...
Starting with Java Persistence Architecture
... factory classes and other helper classes had to be coded. Many developers found the EJB framework overly complex and intrusive and looked for other mechanisms. From around 2000, numerous open-source and commercial projects created Java libraries that allowed simpler persistence models; these project ...
... factory classes and other helper classes had to be coded. Many developers found the EJB framework overly complex and intrusive and looked for other mechanisms. From around 2000, numerous open-source and commercial projects created Java libraries that allowed simpler persistence models; these project ...
Chapter 17
... Store the updated block from the buffer back to disk (either immediately or at some later point in time). ...
... Store the updated block from the buffer back to disk (either immediately or at some later point in time). ...
Relational Database Model - Department of Computer Science
... A relational database consists of a set of relations. A relation has two things in one: a schema and an instance of the schema. The schema defines the relation and an instance is the content of the relation at a given time. An instance of a relation is nothing more than a table with rows and named c ...
... A relational database consists of a set of relations. A relation has two things in one: a schema and an instance of the schema. The schema defines the relation and an instance is the content of the relation at a given time. An instance of a relation is nothing more than a table with rows and named c ...
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[Powerpoint] - SQLSAT565_2-4-8-16
... • SQL Server documentation covers features that are deprecated or discontinued • Do not miss ‘Breaking changes’ • Backward Compatibility documented for each component ...
... • SQL Server documentation covers features that are deprecated or discontinued • Do not miss ‘Breaking changes’ • Backward Compatibility documented for each component ...
Tradeoff in Rule Induction for Semantic Query Optimization
... high savings for a wide range of queries while incurring minimal cost to be used. The cost to use semantic rules includes the storage space for the rules, the computation time to match and apply the rules during the optimization, and the cost to maintain inconsistent rules in the presence of databas ...
... high savings for a wide range of queries while incurring minimal cost to be used. The cost to use semantic rules includes the storage space for the rules, the computation time to match and apply the rules during the optimization, and the cost to maintain inconsistent rules in the presence of databas ...
Kroenke-Auer-DBP-e13-PPT
... • The ODBC (Open Database Connectivity) standard provides a DBMS-independent means for processing relational database data. • It was developed in the early 1990s by an industry committee and has been implemented by Microsoft and many other vendors. • The goal is to allow a developer to create a sing ...
... • The ODBC (Open Database Connectivity) standard provides a DBMS-independent means for processing relational database data. • It was developed in the early 1990s by an industry committee and has been implemented by Microsoft and many other vendors. • The goal is to allow a developer to create a sing ...
Chapter 1 Overview of Database Concepts
... • Remove duplicate lists, using either the DISTINCT or UNIQUE keyword • Combine fields, literals, and other data • Format output ...
... • Remove duplicate lists, using either the DISTINCT or UNIQUE keyword • Combine fields, literals, and other data • Format output ...
SQL - WISE Research Group
... Allows the specification of not only a set of relations but also information about each relation, including: The schema for each relation. The domain of values associated with each attribute. ...
... Allows the specification of not only a set of relations but also information about each relation, including: The schema for each relation. The domain of values associated with each attribute. ...
DB2 9 Application Development exam 733 prep
... The listing also includes a common table expression with the name PAYBYED (short for "pay by education"). It uses the PAYLEVEL table to determine the education level, hire year, and average pay of employees hired in the same year who have identical education levels. The columns returned by this tabl ...
... The listing also includes a common table expression with the name PAYBYED (short for "pay by education"). It uses the PAYLEVEL table to determine the education level, hire year, and average pay of employees hired in the same year who have identical education levels. The columns returned by this tabl ...
Supporting Temporal Text-Containment Queries
... temporal (i.e., whether previous versions should be kept when a new version of the document is inserted into the database). For each document version, some metadata is stored in structures called version descriptors: 1) timestamp and 2) whether the actual version is stored compressed. For some docum ...
... temporal (i.e., whether previous versions should be kept when a new version of the document is inserted into the database). For each document version, some metadata is stored in structures called version descriptors: 1) timestamp and 2) whether the actual version is stored compressed. For some docum ...
Limiting Disclosure in Hippocratic Databases
... Measured performance of a query selecting all records from a 5 millionrecord table Compared performance of original and modified queries for varied choice ...
... Measured performance of a query selecting all records from a 5 millionrecord table Compared performance of original and modified queries for varied choice ...
Microsoft Jet Database Engine
The Microsoft Jet Database Engine is a database engine on which several Microsoft products have been built. A database engine is the underlying component of a database, a collection of information stored on a computer in a systematic way. The first version of Jet was developed in 1992, consisting of three modules which could be used to manipulate a database.Database connect for MicrosoftJET stands for Joint Engine Technology, sometimes being referred to as Microsoft JET Engine or simply Jet. Microsoft Access and Visual Basic use or have used Jet as their underlying database engine. It has since been superseded for general use, however, first by Microsoft Desktop Engine (MSDE), then later by SQL Server Express. For larger database needs, Jet databases can be upgraded (or, in Microsoft parlance, ""up-sized"") to Microsoft's flagship database product, SQL Server.However, this does not mean that a MS Jet (Red) database cannot match MS SQL Server in storage capacity. A 5 billion record MS Jet (Red) database with compression and encryption turned on requires about 1 terabyte of disk storage space, comprising hundreds of (*.mdb) files, each acting as partial table, and not as a database in itself.Over the years, Jet has become almost synonymous with Microsoft Access, to the extent that many people refer to a Jet database as an ""Access database"".