php - Anselm Spoerri
... What can a variable store? What is the difference between $variable = 1 and $variable == 1? Why do you suppose that an underscore is allowed in variable names ($current_user) whereas hyphens are not ($current-user) ? Are variable names case-sensitive? ...
... What can a variable store? What is the difference between $variable = 1 and $variable == 1? Why do you suppose that an underscore is allowed in variable names ($current_user) whereas hyphens are not ($current-user) ? Are variable names case-sensitive? ...
Database Programming in SQL/Oracle
... • Textbooks on Databases (in german): A. Kemper, A. Eickler: Datenbanksysteme - Eine ...
... • Textbooks on Databases (in german): A. Kemper, A. Eickler: Datenbanksysteme - Eine ...
Chapter 13
... increased processor and disk utilization, leading to better transaction throughput: one transaction can be using the CPU while another is reading from or writing to the disk reduced average response time for transactions: short transactions need not wait behind long ones. Concurrency control s ...
... increased processor and disk utilization, leading to better transaction throughput: one transaction can be using the CPU while another is reading from or writing to the disk reduced average response time for transactions: short transactions need not wait behind long ones. Concurrency control s ...
IBM Database Conversion Workbench 2.0 DB2 to DB2 Migration Guide IBM Software
... migrations to DB2 pureScale environments on the IBM PureData System for Transactions. DCW offers the following stepby-step functions to facilitate the process. 1. DCW Task Launcher– An integrated help guide, which provides step by step instructions through the conversion process. 2. Assessment Repor ...
... migrations to DB2 pureScale environments on the IBM PureData System for Transactions. DCW offers the following stepby-step functions to facilitate the process. 1. DCW Task Launcher– An integrated help guide, which provides step by step instructions through the conversion process. 2. Assessment Repor ...
Arguments
... numbers or names, arrays, or references that contain numbers. •Criteria_range1, criteria_range2, … Criteria_range1 is required, subsequent criteria_ranges are optional. 1 to 127 ranges in which to evaluate the associated criteria. •Criteria1, criteria2, ... Criteria1 is required, subsequent criteria ...
... numbers or names, arrays, or references that contain numbers. •Criteria_range1, criteria_range2, … Criteria_range1 is required, subsequent criteria_ranges are optional. 1 to 127 ranges in which to evaluate the associated criteria. •Criteria1, criteria2, ... Criteria1 is required, subsequent criteria ...
Microsoft SQL 2012 MCSA 9 Day
... your Azure server and database. Many of the labs in the rest of this course are enabled for you to perform the lab while connected to your own Azure database in the cloud. Lessons Overview of SQL Azure Working with SQL Azure After completing this module, students will be able to: Describe the ...
... your Azure server and database. Many of the labs in the rest of this course are enabled for you to perform the lab while connected to your own Azure database in the cloud. Lessons Overview of SQL Azure Working with SQL Azure After completing this module, students will be able to: Describe the ...
The design and implementation of pedagogical software for multi-backend/multi-lingual database system.
... language translation and a database model transformation process into the native language. ...
... language translation and a database model transformation process into the native language. ...
ppt
... – How processes will communicate and synchronize with oneanother. – communications mechanisms: • shared memory – very fast – can’t use over a network » well, you can • message passing – can use over a network – slower » well, not always ...
... – How processes will communicate and synchronize with oneanother. – communications mechanisms: • shared memory – very fast – can’t use over a network » well, you can • message passing – can use over a network – slower » well, not always ...
Extending data warehouses by semiconsistent views
... •existential strategy: A precondition of a consistent global database view in web information systems is that no information which should be part of the global result is getting lost during the combination of two data sets relying on regular inner join semantics. Since we focus on this existential c ...
... •existential strategy: A precondition of a consistent global database view in web information systems is that no information which should be part of the global result is getting lost during the combination of two data sets relying on regular inner join semantics. Since we focus on this existential c ...
CCLRC PowerPoint Template
... Data & Metadata • Much of this data is inaccessible • Need to be able to – Find relevant data as information – Understand it : syntax, semantics – Understand any restrictions on its use METADATA ...
... Data & Metadata • Much of this data is inaccessible • Need to be able to – Find relevant data as information – Understand it : syntax, semantics – Understand any restrictions on its use METADATA ...
Oracle RAC Installation
... Once you have partitioned the disks, navigate to C:\temp\preinstall_rac\olm directory and run the OracleOBJService at the command line as below:OracleOBJService /install This will install the service to manage the object links in the ‘Services’ panel. Once done, from the same directory run the GuiOb ...
... Once you have partitioned the disks, navigate to C:\temp\preinstall_rac\olm directory and run the OracleOBJService at the command line as below:OracleOBJService /install This will install the service to manage the object links in the ‘Services’ panel. Once done, from the same directory run the GuiOb ...
SQL Server 2008 Compared to Oracle Database 11g
... numerous benefits. They provide space-saving and performance improvements when you insert or update content. Filtered indexes can greatly improve data-warehousing performance. For example, you can index only the data for the current month rather than the data for an entire year. You can create more ...
... numerous benefits. They provide space-saving and performance improvements when you insert or update content. Filtered indexes can greatly improve data-warehousing performance. For example, you can index only the data for the current month rather than the data for an entire year. You can create more ...
An Integrated Approach to Recovery and High Availability in an Updatable, Distributed Data Warehouse
... and recovery to ensure transactional semantics. One commonly used approach is to implement snapshot isolation [4], which allows read-only queries to avoid setting any locks by having them read a historical snapshot of the database starting from some point in recent history. In such updatable environ ...
... and recovery to ensure transactional semantics. One commonly used approach is to implement snapshot isolation [4], which allows read-only queries to avoid setting any locks by having them read a historical snapshot of the database starting from some point in recent history. In such updatable environ ...
Storing and Querying Large Interconnected HL7 V3 RIM Object Nets
... ClinicalDocument act. It's even harder than this, because we can’t just navigate to the root ClinicalDocument. How do we know where and if the Subject of Record, Author, Performer or other important context has been over ridden in a Section (Figure 1, middle oval)? You would have to check each Act a ...
... ClinicalDocument act. It's even harder than this, because we can’t just navigate to the root ClinicalDocument. How do we know where and if the Subject of Record, Author, Performer or other important context has been over ridden in a Section (Figure 1, middle oval)? You would have to check each Act a ...
Extensible Indexing: A Framework for Integrating Domain
... extensible server which allows users to define new index types. In Oracle8i, this is achieved through Extensible Indexing, a SQL-based interface that allows users to define domain-specific operators and indexing schemes, and integrate them into the Oracle8 i server. Oracle provides a set of pre-defi ...
... extensible server which allows users to define new index types. In Oracle8i, this is achieved through Extensible Indexing, a SQL-based interface that allows users to define domain-specific operators and indexing schemes, and integrate them into the Oracle8 i server. Oracle provides a set of pre-defi ...
Optimizing Large Data Handling in SAP ASE for Better
... much tempdb space a single user could consume. When the limit was reached the DBA could either kill that query or warn the user about the limits before the query would affect other users. While useful, the implementation of multiple tempdbs was still not enough to completely address the needs of VLD ...
... much tempdb space a single user could consume. When the limit was reached the DBA could either kill that query or warn the user about the limits before the query would affect other users. While useful, the implementation of multiple tempdbs was still not enough to completely address the needs of VLD ...
Weak Entity Sets
... contents of the database. A database which conforms to an E-R diagram can be ...
... contents of the database. A database which conforms to an E-R diagram can be ...
SQL Server Indexing for the Client Developer
... Non-Clustered indexes always contain the clustered index columns (when table has a clustered index) When table is a heap, the Row ID is stored in every nonclustered index. Can be created on any filegroup within the database Can be filtered indexes to include fewer rows in the index. ...
... Non-Clustered indexes always contain the clustered index columns (when table has a clustered index) When table is a heap, the Row ID is stored in every nonclustered index. Can be created on any filegroup within the database Can be filtered indexes to include fewer rows in the index. ...
Adaptive Cost Estimation for Client-Server based Heterogeneous Database Systems
... byte of data transmitted over the network, respectively. Usually, these weights are empirical values obtained by running a large set of sample queries and are hard-coded into the DBMS kernel. Details about the local access methods of the query plan must be known a priori in order to estimate the par ...
... byte of data transmitted over the network, respectively. Usually, these weights are empirical values obtained by running a large set of sample queries and are hard-coded into the DBMS kernel. Details about the local access methods of the query plan must be known a priori in order to estimate the par ...
Spatial Database - EPPS Academic Computing
... an IBM Universal Database. Spatial data may be manipulated within the database by utilizing spatial extender functions to return GIS information in tabular format. A separate visualization tool is needed to see a graphic representation such as a map. ...
... an IBM Universal Database. Spatial data may be manipulated within the database by utilizing spatial extender functions to return GIS information in tabular format. A separate visualization tool is needed to see a graphic representation such as a map. ...
Oracle Database 11g Family
... Oracle Database Express Edition (XE) is an entry-level, small-footprint database based on the enterprise code base that's free to develop, deploy, and distribute; fast to download; and simple to administer. Oracle Database XE can be installed on any size host machine with any number of CPUs (one dat ...
... Oracle Database Express Edition (XE) is an entry-level, small-footprint database based on the enterprise code base that's free to develop, deploy, and distribute; fast to download; and simple to administer. Oracle Database XE can be installed on any size host machine with any number of CPUs (one dat ...
Analysis of parallel scan processing in Shared Disk database systems
... degree of scan parallelism for an average load profile [Gh90]. If both scan queries of our example are processed with equal probability, the relation would thus have to be partitioned among 50 nodes resulting in sub-optimal performance for both query types (enormous communication overhead for the in ...
... degree of scan parallelism for an average load profile [Gh90]. If both scan queries of our example are processed with equal probability, the relation would thus have to be partitioned among 50 nodes resulting in sub-optimal performance for both query types (enormous communication overhead for the in ...
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.