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ppt
ppt

... larger number of transactions per second ...
transaction processing in pdf
transaction processing in pdf

... from different transactions. Actually, operations on different arguments need not be ordered in time, provided conflicting ones are. Schedule is serializable if following graph (serialization graph) is acyclic: Nodes are transactions. Edge from Ti to Tj if an operation from Ti precedes and conflicts ...
Java Database Connectivity (JDBC)
Java Database Connectivity (JDBC)

... • Type 1: Uses a bridging technology to access a database. JDBC-ODBC bridge is an example. It provides a gateway to the ODBC. • Type 2: Native API drivers. Driver contains Java code that calls native C/C++ methods provided by the database vendors. • Type 3: Generic network API that is then translate ...
Oracle Migration Assessment
Oracle Migration Assessment

... These database are considered moderate to good candidates for migration. It is recommended that the customer utilize some consulting help from EnterpriseDB to accomplish the migration as some features may need a significantly different implementation or solution than currently in use. The actual mig ...
VERITAS Storage Extension for EMC DELIVERING
VERITAS Storage Extension for EMC DELIVERING

... Extension for EMC is correlating this information back to operating system, database, and application metrics so that when a device is busy, you also know what impact, if any the busy device is having on the user’s application. In addition, Storage Extension for EMC provides information on the Host ...
db_ch4
db_ch4

... select branch-name, count (distinct customer-name) from depositor, account where depositor.account-number = account.account-number group by branch-name Note: Attributes in select clause outside of aggregate functions must appear in group by list ...
Introduction to Database Management Systems for Clinical Research
Introduction to Database Management Systems for Clinical Research

... The reader should also be familiar with basic data types, such as the text, integer, real, and date types. Because we assume this familiarity, we can focus initially on the definition of primary and foreign keys and on the principle of normalization, which is the process of breaking a single, comple ...
A Real World Scenario of a SQL Server 2005 Database
A Real World Scenario of a SQL Server 2005 Database

... The Microsoft extended procedure “xp_cmdshell” allows users to execute dos commands within the underlying host operating system using their SQL client. This can allow an attacker who compromises the SQL Server to then launch attacks against the underlying host operating ...
Using Automatic Workload Repository for Database
Using Automatic Workload Repository for Database

The Sublime Secrets of the SAS SQLheads
The Sublime Secrets of the SAS SQLheads

... subset rows? Any number of toy programming systems can do that. The tieing together of SQL to the logical objects called ‘relations', of linkage keys in databases to sets, and of conditions to Boolean logic means that a database programmer can represent any information as relations, and represent al ...
SQL 1 - New Paltz
SQL 1 - New Paltz

... • In RA we used the QUOTIENT operator for this query. • In SQL we use NOT EXISTS • Rewrite the query in English with NOT EXISTS Find the cardholders where there does NOT EXIST a book published by Addison-Wesley that they did not reserve. Find the cardholders where there does NOT EXIST a book publish ...
jdbc
jdbc

...  Lets you smoothly translate between the world of the database, and the world of the Java application.  The idea of a universal database access API is not a new one. For example, Open Database Connectivity (ODBC) was developed to create a single standard for database access in the Windows environm ...
lecture12
lecture12

...  Lets you smoothly translate between the world of the database, and the world of the Java application.  The idea of a universal database access API is not a new one. For example, Open Database Connectivity (ODBC) was developed to create a single standard for database access in the Windows environm ...
New Software for Ensemble Creation in the - adass xiv
New Software for Ensemble Creation in the - adass xiv

... A DCE set is stored with one or more ensembles (dceSetId is associated with ensId) An ensemble is characterized in the database by dceSetId and plScriptId Two or more ensembles can be associated together for processing a set of ensembles by creating a new ensemble with NULL dceSetId and two or more ...
Slide 1
Slide 1

... 4. If the Choose Data Source dialog box opens, select the Microsoft Access Database File option and click Continue. Otherwise, we should directly see the Add Connection dialog box. Select the University database. Test the connection and click OK. ...
Arbiter documentation
Arbiter documentation

TeXOR: Temporal XML Database on an Object
TeXOR: Temporal XML Database on an Object

Oracle 11g -Snapshot Standby and Active Data Guard - oracle-info
Oracle 11g -Snapshot Standby and Active Data Guard - oracle-info

...  When communication with the standby is restored, the ARCH ping process queries the standby control file (via its RFS process) to determine the last complete log file that the standby received from the primary database.  It determines which log files are required to resynchronize the standby datab ...
VB Advanced Database Connectivity
VB Advanced Database Connectivity

... 4. If the Choose Data Source dialog box opens, select the Microsoft Access Database File option and click Continue. Otherwise, we should directly see the Add Connection dialog box. Select the University database. Test the connection and click OK. ...
New Horizons Courseware Outlines
New Horizons Courseware Outlines

... Use queries to join, sort, and filter data from different tables. Use forms to make it easier to view, access, and input data. Create and format custom reports. ...
Forensic data recovery from the Windows Search Database
Forensic data recovery from the Windows Search Database

... although over 300 fields are needed for the distinctive attributes of all possible record types (e.g. text, image, email.), each record contains only the few tens of data items relevant to its type. One important field in the schema is autosummary, which is used to store an extract of a file’s conte ...
Comparison of Data Base Technologies for APT Detection
Comparison of Data Base Technologies for APT Detection

... to unlock significant value by making information accessible in a nearly real time. The main goal of this project is to study how to translate analyst’s complex questions into sets of queries and to realize a comparison between PostgreSQL, MongoDB and Elasticsearch database management systems in ord ...
Database Management Systems
Database Management Systems

... Additional features of SQL; Database programming issues and techniques; Embedded SQL, Dynamic SQL; Database stored procedures and SQL/PSM. 5. Database Design Informal Design Guidelines for Relation Schemas; Functional Dependencies; Normal Forms Based on Primary Keys; General Definitions of Second an ...
1. Translate each entity set into a table, with keys. Multi
1. Translate each entity set into a table, with keys. Multi

... ER to Tables, Method 2 (Book) ...
branch-name - VUB STARLab
branch-name - VUB STARLab

... balance is more than $1,200. select branch-name, avg (balance) from account group by branch-name having avg (balance) > 1200 ...
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Concurrency control

In information technology and computer science, especially in the fields of computer programming, operating systems, multiprocessors, and databases, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.Computer systems, both software and hardware, consist of modules, or components. Each component is designed to operate correctly, i.e., to obey or to meet certain consistency rules. When components that operate concurrently interact by messaging or by sharing accessed data (in memory or storage), a certain component's consistency may be violated by another component. The general area of concurrency control provides rules, methods, design methodologies, and theories to maintain the consistency of components operating concurrently while interacting, and thus the consistency and correctness of the whole system. Introducing concurrency control into a system means applying operation constraints which typically result in some performance reduction. Operation consistency and correctness should be achieved with as good as possible efficiency, without reducing performance below reasonable levels. Concurrency control can require significant additional complexity and overhead in a concurrent algorithm compared to the simpler sequential algorithm.For example, a failure in concurrency control can result in data corruption from torn read or write operations.
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