National Academy for Software Development
... • If transaction has read lock on an item, the item can be read but not modified • If transaction has write lock on an item, the item can be both read and modified • Reads cannot conflict, so multiple transactions can hold read locks simultaneously on the same item • Write lock gives one transaction ...
... • If transaction has read lock on an item, the item can be read but not modified • If transaction has write lock on an item, the item can be both read and modified • Reads cannot conflict, so multiple transactions can hold read locks simultaneously on the same item • Write lock gives one transaction ...
Data Concurrency and Consistency
... affect (SELECT, INSERT, UPDATE, or DELETE, respectively). A SELECT statement is an explicit query and may have nested queries or a join operation. An INSERT statement can use nested queries. UPDATE and DELETE statements can use WHERE clauses or subqueries to affect only some rows in a table rather t ...
... affect (SELECT, INSERT, UPDATE, or DELETE, respectively). A SELECT statement is an explicit query and may have nested queries or a join operation. An INSERT statement can use nested queries. UPDATE and DELETE statements can use WHERE clauses or subqueries to affect only some rows in a table rather t ...
Optimistic Concurrency Control in a Distributed NameNode
... application side. With the id and parent id relationship, the hierarchy will be constructed correctly from the data rows to in-memory objects used by the name system. Namespace Concurrency Control In the first version of Hop-HDFS [6] (also named as KTHFS), the main task is to migrate the metadata fr ...
... application side. With the id and parent id relationship, the hierarchy will be constructed correctly from the data rows to in-memory objects used by the name system. Namespace Concurrency Control In the first version of Hop-HDFS [6] (also named as KTHFS), the main task is to migrate the metadata fr ...
QA Wizard Pro External Datasheets How To
... INTEGER—Non-decimal numeric values (whole numbers); valid width values are 32767 to -32766 ...
... INTEGER—Non-decimal numeric values (whole numbers); valid width values are 32767 to -32766 ...
Securing MS-SQL Server 2000
... Accounts should not be shared among different people. This reduces accountability and increases chances of security breaches. ...
... Accounts should not be shared among different people. This reduces accountability and increases chances of security breaches. ...
Using the ORACLE LIBNAME Engine to Reduce the Time it Takes to Extract Data From an ORACLE Database
... The code below uses the ORACLE LIBNAME engine to access ORACLE tables. Macro variables are used because SAS MPCONNECT is used extensively to access the same ORACLE database in multiple child jobs. Using macro variables allows us to enter the database names and passwords at one time. This reduces mos ...
... The code below uses the ORACLE LIBNAME engine to access ORACLE tables. Macro variables are used because SAS MPCONNECT is used extensively to access the same ORACLE database in multiple child jobs. Using macro variables allows us to enter the database names and passwords at one time. This reduces mos ...
Access Tutorial 1: Creating a Database
... A collection of related tables The specific content of a field Connects the records in separate tables A single characteristic or attribute of a person, place, object, event, or idea A primary key from one table that is used to form a relationship with a second table A collection of fields that desc ...
... A collection of related tables The specific content of a field Connects the records in separate tables A single characteristic or attribute of a person, place, object, event, or idea A primary key from one table that is used to form a relationship with a second table A collection of fields that desc ...
Infrastructure, Data Cleansing and Data Mining
... goals and high level polocies http://www.ibm.com/autonomic System takes care of itself ...
... goals and high level polocies http://www.ibm.com/autonomic System takes care of itself ...
Representing and Storing Structured Data LBSC 690: Jordan Boyd-Graber October 15, 2012
... Databases are suitable for storing structured information Databases are important tools to organize, manipulate, and access structured information Databases are integral components of modern Web applications ...
... Databases are suitable for storing structured information Databases are important tools to organize, manipulate, and access structured information Databases are integral components of modern Web applications ...
Managing database connections with JDBC
... provides the consumer with more choices, and for the most part, produces better software. With all of the available drivers, choosing one can be difficult. Fortunately, Sun Microsystems maintains a searchable database of over 150 JDBC drivers from a wide array of vendors. This should be your first s ...
... provides the consumer with more choices, and for the most part, produces better software. With all of the available drivers, choosing one can be difficult. Fortunately, Sun Microsystems maintains a searchable database of over 150 JDBC drivers from a wide array of vendors. This should be your first s ...
A Database-based Email System
... A filter is applied by executing the SIEVE code corresponding to it. The filter determines which of the labels defined by the user to apply to the mail. Rukma Prabhu Verlekar Neela Sawant Meghana Kshirsagar ...
... A filter is applied by executing the SIEVE code corresponding to it. The filter determines which of the labels defined by the user to apply to the mail. Rukma Prabhu Verlekar Neela Sawant Meghana Kshirsagar ...
PL/SQL programmu paketes (packages)
... Lets you create groups of snapshots that can be refreshed together to a transactionally consistent point in time Requires the Distributed Option ...
... Lets you create groups of snapshots that can be refreshed together to a transactionally consistent point in time Requires the Distributed Option ...
ODB Training 2005
... History: odbviewer was originally written to be used as a debugging tool for ODB software development Linked with ECMWF graphics package MAGICS/MAGICS++ it displays coverage plots Also a textual report generator Displays output of data queries “Sensitive” to ODB/SQL-language : tries automa ...
... History: odbviewer was originally written to be used as a debugging tool for ODB software development Linked with ECMWF graphics package MAGICS/MAGICS++ it displays coverage plots Also a textual report generator Displays output of data queries “Sensitive” to ODB/SQL-language : tries automa ...
Oracle Database 11g for Windows and .NET
... More Information • OTN Fusion Middleware and Microsoft • http://www.oracle.com/technology/products/mid dleware/fusion-middleware-microsoftinteroperability.html ...
... More Information • OTN Fusion Middleware and Microsoft • http://www.oracle.com/technology/products/mid dleware/fusion-middleware-microsoftinteroperability.html ...
(Intro) Hello. I am Paul, the virtual instructor for this... Replay e-learning course.
... The Replay Results tab shows a summary of the replay accuracy. From here you can drill down into more granular reports if needed. In this example, the results show that 618 SQL statements were executed and that they all matched perfectly, giving 100 percent accuracy. The report consolidates all the ...
... The Replay Results tab shows a summary of the replay accuracy. From here you can drill down into more granular reports if needed. In this example, the results show that 618 SQL statements were executed and that they all matched perfectly, giving 100 percent accuracy. The report consolidates all the ...
MARCH 2016 -bsc
... (b) Explain about Java API packages. Or (c) Define an interface. Explain about the interfaces with examples. (d) Write a program to check whether a given string is palindrome or not. 5. (a) Define Thread. Explain about try, catch, final, throw statements. (b) How to create an executable applet? Or ( ...
... (b) Explain about Java API packages. Or (c) Define an interface. Explain about the interfaces with examples. (d) Write a program to check whether a given string is palindrome or not. 5. (a) Define Thread. Explain about try, catch, final, throw statements. (b) How to create an executable applet? Or ( ...
Data Pump Article
... operation, or review the spooled output from an operation, there is no simple way to tell exactly how efficiently an Export or Import operation is performing, and there is no simple way to tell exactly what percentage of a large operation is completed. Database object filtering features are limited. ...
... operation, or review the spooled output from an operation, there is no simple way to tell exactly how efficiently an Export or Import operation is performing, and there is no simple way to tell exactly what percentage of a large operation is completed. Database object filtering features are limited. ...
Installation Guide BlackBerry Enterprise Service 12 Version 12.0
... BES12 listening ports......................................................................................................................................................23 Troubleshooting BES5 roles................................................................................................... ...
... BES12 listening ports......................................................................................................................................................23 Troubleshooting BES5 roles................................................................................................... ...
Aras Innovator - Backup and Recovery
... Storage technology changes rapidly, so it is important to research the merits of various media before you make a decision. When selecting a storage device, consider drive and media costs, as well as reliability and capacity. ...
... Storage technology changes rapidly, so it is important to research the merits of various media before you make a decision. When selecting a storage device, consider drive and media costs, as well as reliability and capacity. ...
Transactions Transactions Transaction Concept Example of Fund
... of same record must return same value. However, a transaction may not be serializable – it may find some records inserted by a transaction but not find others. reads of record may return different (but committed) values. ...
... of same record must return same value. However, a transaction may not be serializable – it may find some records inserted by a transaction but not find others. reads of record may return different (but committed) values. ...
Global Payroll Performance Optimisation - II David Kurtz
... • The data set that you query remains the same throughout the life of your query. – If somebody else updates data that you are reading (and commits), after your query starts, then you see the original value. ...
... • The data set that you query remains the same throughout the life of your query. – If somebody else updates data that you are reading (and commits), after your query starts, then you see the original value. ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.