slides
... – if Tt < Dr, abort T (can't write something read by later transaction) – else if Tt < Dw, ignore [Thomas Write Rule] (already overwritten. Note: for blind writes only; most updates are a read+write) – else Dw Tt [shows it was written by T] ...
... – if Tt < Dr, abort T (can't write something read by later transaction) – else if Tt < Dw, ignore [Thomas Write Rule] (already overwritten. Note: for blind writes only; most updates are a read+write) – else Dw Tt [shows it was written by T] ...
SSSS - Computer Science
... consists of: Data Definition Language – defines the description of objects, and Data Manipulation Language – manipulates queries. One global language therefore only one kind of translator. Without this global language would need a translator to and from every other language in the system. DDBS Nuc ...
... consists of: Data Definition Language – defines the description of objects, and Data Manipulation Language – manipulates queries. One global language therefore only one kind of translator. Without this global language would need a translator to and from every other language in the system. DDBS Nuc ...
Chapter13. Query Processing
... For AV (r) just scan relation sequentially till first tuple > v; do not use index A7 (secondary index, comparison). For A V(r) use index to find first index entry v and scan index sequentially from there, to find pointers to records. ...
... For AV (r) just scan relation sequentially till first tuple > v; do not use index A7 (secondary index, comparison). For A V(r) use index to find first index entry v and scan index sequentially from there, to find pointers to records. ...
Evolution of Database Technology
... OLTP systems have been optimized for updates, as the main business activity is typically to sell a good or ...
... OLTP systems have been optimized for updates, as the main business activity is typically to sell a good or ...
Translation of ER-diagram into Relational Schema
... • Entries in columns are from the same set of values • Each row is unique • The sequence of columns can be interchanged without changing the meaning or use of the relation ...
... • Entries in columns are from the same set of values • Each row is unique • The sequence of columns can be interchanged without changing the meaning or use of the relation ...
On Replication - Informatics Homepages Server
... • Is not a replicated system – deal with when/where to copy – Optimization (how much replica needed …) – Grow or shrink replication tree ...
... • Is not a replicated system – deal with when/where to copy – Optimization (how much replica needed …) – Grow or shrink replication tree ...
Project Pxxx - EURESCOM Home Page
... available database technology, such as data warehouses, parallel databases, multidimensional databases, real-time databases and replication servers. Another important area of concern will be on the overall architecture of the database and the application tools and the different interaction patterns ...
... available database technology, such as data warehouses, parallel databases, multidimensional databases, real-time databases and replication servers. Another important area of concern will be on the overall architecture of the database and the application tools and the different interaction patterns ...
Subject: Database Management Systems
... reduce that value by the amount being withdrawn, and write the result back. If the two programs run concurrently, they may both read the value $500, and write back $450 and $400, respectively. Depending on which one writes the value last, the account may contain either $450 or $400, rather than the ...
... reduce that value by the amount being withdrawn, and write the result back. If the two programs run concurrently, they may both read the value $500, and write back $450 and $400, respectively. Depending on which one writes the value last, the account may contain either $450 or $400, rather than the ...
SQL Server 2000_ado_xsl
... configuration tool that allows developers to gain remote access to databases using URL based queries over HTTP. For example, we can setup an SQL XML virtual directory on our Web server named "myVirtual". Then, assuming we have the appropriate security permissions, we can use any browser to query our ...
... configuration tool that allows developers to gain remote access to databases using URL based queries over HTTP. For example, we can setup an SQL XML virtual directory on our Web server named "myVirtual". Then, assuming we have the appropriate security permissions, we can use any browser to query our ...
Databases with Minimal Trust
... structure exchange protocol. Let us say that such a protocol begins at global time t. Every user u sends the most recent version structure that u signed before time t to every other user. Call that vs_u. • When a user v receives vs_u from user u, then user v performs a “well-formedness” test: v comp ...
... structure exchange protocol. Let us say that such a protocol begins at global time t. Every user u sends the most recent version structure that u signed before time t to every other user. Call that vs_u. • When a user v receives vs_u from user u, then user v performs a “well-formedness” test: v comp ...
The Relational Model
... ICs are based upon the semantics of the realworld enterprise that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
... ICs are based upon the semantics of the realworld enterprise that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
download
... control file SCN and the lowest SCN in the datafile headers. To perform media recovery either apply archived redo logs or, if you are using Recovery Manager, apply incremental backups and/or archived logs. All redo data is located in the archived and online redo logs. Inconsistent Backups An inconsi ...
... control file SCN and the lowest SCN in the datafile headers. To perform media recovery either apply archived redo logs or, if you are using Recovery Manager, apply incremental backups and/or archived logs. All redo data is located in the archived and online redo logs. Inconsistent Backups An inconsi ...
Strong Types for Relational Data Stored in Databases or
... column should be. Furthermore, some columns may be singled out as keys, some may be allowed to take null values. Constraints can be declared for specific columns, and foreign key constraints can be provided to prescribe relationships between tables. Operations on a database should preserve its well- ...
... column should be. Furthermore, some columns may be singled out as keys, some may be allowed to take null values. Constraints can be declared for specific columns, and foreign key constraints can be provided to prescribe relationships between tables. Operations on a database should preserve its well- ...
SolarWinds Technical Reference
... You may choose to install Orion products on virtual servers. The requirement for virtual servers is that they be assigned the same resources as a physical server would have. Specific requirements for servers are listed in the product’s Administrative Guide. This includes additional poling engines, a ...
... You may choose to install Orion products on virtual servers. The requirement for virtual servers is that they be assigned the same resources as a physical server would have. Specific requirements for servers are listed in the product’s Administrative Guide. This includes additional poling engines, a ...
Document
... To generate faith in the computing system, a transaction will have the ACID properties: Atomic – a transaction is done in its entirety, or not at all Consistent – a transaction leaves the database in a correct state. This is generally up to the programmer to guarantee. Isolation – a transactio ...
... To generate faith in the computing system, a transaction will have the ACID properties: Atomic – a transaction is done in its entirety, or not at all Consistent – a transaction leaves the database in a correct state. This is generally up to the programmer to guarantee. Isolation – a transactio ...
PARALLEL EXECUTION FACILITY CONFIGURATION AND USE
... execute a query, which was available as the Parallel Query Option (PQO). The goal was to return results to the user more quickly than with serial execution, at the expense of consuming additional system resources. This capability was greatly expanded with each new release of Oracle Enterprise Server ...
... execute a query, which was available as the Parallel Query Option (PQO). The goal was to return results to the user more quickly than with serial execution, at the expense of consuming additional system resources. This capability was greatly expanded with each new release of Oracle Enterprise Server ...
Programming in Oracle with PL/SQL
... • A set of SQL and PL/SQL statements grouped together as a unit (block) to solve a specific problem or perform a set of related tasks. • An anonymous block is a PL/SQL block that appears within your application and it is not named or stored in the database. In many applications, PL/SQL blocks can ap ...
... • A set of SQL and PL/SQL statements grouped together as a unit (block) to solve a specific problem or perform a set of related tasks. • An anonymous block is a PL/SQL block that appears within your application and it is not named or stored in the database. In many applications, PL/SQL blocks can ap ...
Part 4: The Relational Model
... one of the given data types, the data type operations can be used to extract day, month, year. And also, when data type operations are used, strings are not really atomic, but instead a sequence of characters. ...
... one of the given data types, the data type operations can be used to extract day, month, year. And also, when data type operations are used, strings are not really atomic, but instead a sequence of characters. ...
Introduction
...
...
The Database Analyst/Administrator is responsible for all database management functions for the Administrative Office of the Courts. The Analyst/Administrator will be responsible for the tactical planning, administration, and support of all database applications. < ...
XML
... Nesting is supported in object-relational databases (?*!—CZ) But nesting is appropriate when transferring data ...
... Nesting is supported in object-relational databases (?*!—CZ) But nesting is appropriate when transferring data ...