comlab.ox.ac.uk - Department of Computer Science, Oxford
... Thus, there is a significant efficiency gap between safe queries and unsafe queries. The query processor has to make a decision whether the query is safe, and then it can be evaluated using an extensional plan, or unsafe, in which case a much slower intensional method is used. In this paper we propo ...
... Thus, there is a significant efficiency gap between safe queries and unsafe queries. The query processor has to make a decision whether the query is safe, and then it can be evaluated using an extensional plan, or unsafe, in which case a much slower intensional method is used. In this paper we propo ...
R i - My FIT
... 5000 400 + 100 = 2,000,100 with depositor as outer relation. 10000 100 + 400 = 1,000,400 with customer as the outer relation. Assuming best case: ...
... 5000 400 + 100 = 2,000,100 with depositor as outer relation. 10000 100 + 400 = 1,000,400 with customer as the outer relation. Assuming best case: ...
Transactional Consistency and Automatic Management
... server bottlenecks can be easier to address by adding more nodes, but this also quickly becomes expensive. Application-level data caches, such as memcached [24], Velocity/AppFabric [34] and NCache [25], are a popular solution to server and database bottlenecks. ...
... server bottlenecks can be easier to address by adding more nodes, but this also quickly becomes expensive. Application-level data caches, such as memcached [24], Velocity/AppFabric [34] and NCache [25], are a popular solution to server and database bottlenecks. ...
5 Networks and Collaboration As Business Solutions Information
... different data-manipulating applications, the same data could be duplicated in several files. • Data inconsistency – Actual data values are not synchronized across various copies of data. For example, Customers with serveral loans, for each loan there is a file containing customer fields (name, addr ...
... different data-manipulating applications, the same data could be duplicated in several files. • Data inconsistency – Actual data values are not synchronized across various copies of data. For example, Customers with serveral loans, for each loan there is a file containing customer fields (name, addr ...
Oracle/SQL Tutorial - Department of Math/CS
... SQL uses the terms table, row, and column for relation, tuple, and attribute, respectively. In this tutorial we will use the terms interchangeably. A table can have up to 254 columns which may have different or same data types and sets of values (domains), respectively. Possible domains are alphanum ...
... SQL uses the terms table, row, and column for relation, tuple, and attribute, respectively. In this tutorial we will use the terms interchangeably. A table can have up to 254 columns which may have different or same data types and sets of values (domains), respectively. Possible domains are alphanum ...
High Availability Installation Instructions
... For the High Availability instance of Passwordstate, there are a few things to consider relating to SQL Server. Let Passwordstate Create its Own Database Prior to installing Passwordstate, you must have an SQL Account with sufficient permissions to create the database and tables (generally an SQL Se ...
... For the High Availability instance of Passwordstate, there are a few things to consider relating to SQL Server. Let Passwordstate Create its Own Database Prior to installing Passwordstate, you must have an SQL Account with sufficient permissions to create the database and tables (generally an SQL Se ...
Course Outline
... database. As Hal Varian remarked in a personal conversation last year, "SQL is the new HTML." Database management is a core competency of Web 2.0 companies, so much so that we have sometimes referred to these ...
... database. As Hal Varian remarked in a personal conversation last year, "SQL is the new HTML." Database management is a core competency of Web 2.0 companies, so much so that we have sometimes referred to these ...
Slide 1
... • Familiar access through pathnames, directories, links • Files kept in a dedicated file store, or existing application tables ...
... • Familiar access through pathnames, directories, links • Files kept in a dedicated file store, or existing application tables ...
Tradeoff in Rule Induction for Semantic Query Optimization
... reduction. A set of semantic rules is extremely effective if, for any query, it allows the optimizer to reformulate the query into the optimal equivalent query. Intuitively, an optimal equivalent query is the one that returns the same answer and can be executed with the lowest possible cost. If we t ...
... reduction. A set of semantic rules is extremely effective if, for any query, it allows the optimizer to reformulate the query into the optimal equivalent query. Intuitively, an optimal equivalent query is the one that returns the same answer and can be executed with the lowest possible cost. If we t ...
Lecture Notes Part 1 - 354KB
... What’s really happening when we query a view?? © Daniel S. Weld, PLANET 2003 Tutorial on Data Integration ...
... What’s really happening when we query a view?? © Daniel S. Weld, PLANET 2003 Tutorial on Data Integration ...
Document
... Order of tuples is irrelevant (tuples may be stored in an arbitrary order) Example: account relation with unordered tuples ...
... Order of tuples is irrelevant (tuples may be stored in an arbitrary order) Example: account relation with unordered tuples ...
Multi-Domain Integration with MOF and extended Triple
... consistency rules. These rules are often written in a graphical form using a UML-like notation [UML]. All approaches have in common that they fulfil the Dagstuhl Seminar Proceedings 04101 http://drops.dagstuhl.de/opus/volltexte/2005/22 ...
... consistency rules. These rules are often written in a graphical form using a UML-like notation [UML]. All approaches have in common that they fulfil the Dagstuhl Seminar Proceedings 04101 http://drops.dagstuhl.de/opus/volltexte/2005/22 ...
Chapter 15
... series of transaction rollbacks. Consider the following schedule where none of the transactions has yet committed (so the schedule is recoverable) ...
... series of transaction rollbacks. Consider the following schedule where none of the transactions has yet committed (so the schedule is recoverable) ...
Transparent Java access to mediated database objects
... result set, management of multi-valued functions using scan objects, handling of scan objects for a specific type, handling of methods (functions) that cannot be derived to a specific type and management of null values in the result of a query. As a complement to the practical work, we have conducte ...
... result set, management of multi-valued functions using scan objects, handling of scan objects for a specific type, handling of methods (functions) that cannot be derived to a specific type and management of null values in the result of a query. As a complement to the practical work, we have conducte ...
LADS Plus Network Installation Guide 2
... A pair of files called LADS.mdf and LADS_log.ldf form the database in case you need to find them later. REMINDER You only need to install the LADS Plus application once, onto a server, which can be the same one where the SQL Server database engine is. Multiple workstations (clients) will run LADS Pl ...
... A pair of files called LADS.mdf and LADS_log.ldf form the database in case you need to find them later. REMINDER You only need to install the LADS Plus application once, onto a server, which can be the same one where the SQL Server database engine is. Multiple workstations (clients) will run LADS Pl ...
MCA SYLLABUS (Revised in 2012)
... Category: MC No of Hours/week: 4 Objectives: 1. To give foundation in statistical aspect of computer science 2. To train students in SPSS statistical software package. Unit I Basic Statistics Review of Measures of Central Tendency – Measures of Dispersion: Introduction Range - Coefficient of Range - ...
... Category: MC No of Hours/week: 4 Objectives: 1. To give foundation in statistical aspect of computer science 2. To train students in SPSS statistical software package. Unit I Basic Statistics Review of Measures of Central Tendency – Measures of Dispersion: Introduction Range - Coefficient of Range - ...
A Fast Search Algorithm for a Large Fuzzy Database
... NNS is defined as follows: given a set of points in a high-dimensional space, construct a data structure which, given any query point , finds the point closest to under a defined distance metric [7]. The NNS problem has been extensively studied for the past two decades. The results, however, are far ...
... NNS is defined as follows: given a set of points in a high-dimensional space, construct a data structure which, given any query point , finds the point closest to under a defined distance metric [7]. The NNS problem has been extensively studied for the past two decades. The results, however, are far ...
Management Tools
... the storage checkpoint before the new data is written. As the primary file system continues to change, the storage checkpoint accumulates ...
... the storage checkpoint before the new data is written. As the primary file system continues to change, the storage checkpoint accumulates ...
Part - Courses - University of California, Berkeley
... 1NF Storage Anomalies • Insertion: A new patient has not yet undergone surgery -- hence no surgeon # -- Since surgeon # is part of the key we can’t insert. • Insertion: If a surgeon is newly hired and hasn’t operated yet -- there will be no way to include that person in the database. • Update: If a ...
... 1NF Storage Anomalies • Insertion: A new patient has not yet undergone surgery -- hence no surgeon # -- Since surgeon # is part of the key we can’t insert. • Insertion: If a surgeon is newly hired and hasn’t operated yet -- there will be no way to include that person in the database. • Update: If a ...
Document
... but can have good bandwidth All have same peak CPU performance but synchronization costs increase as one goes from 1) to 3) Cost of system (dollars per gigaflop) decreases by factors of 2 at each step from 1) to 2) to 3) One should NOT use classic MPP if class 2) or 3) suffices unless some security ...
... but can have good bandwidth All have same peak CPU performance but synchronization costs increase as one goes from 1) to 3) Cost of system (dollars per gigaflop) decreases by factors of 2 at each step from 1) to 2) to 3) One should NOT use classic MPP if class 2) or 3) suffices unless some security ...
Document
... select /*+ result_cache */ … The results of the query are stored in the SGA Result Cache – a new area in SGA result_cache_max_size states the size of RC ...
... select /*+ result_cache */ … The results of the query are stored in the SGA Result Cache – a new area in SGA result_cache_max_size states the size of RC ...
Managing scientific data - Infoscience
... experiments, data model, and measurement units. Other kinds of metadata are extracted from raw data, possibly through ontologies. Metadata may also denote data relationships and quality. Annotating the data, all metadata (accumulated or extracted) is critical to deducing experimental conclusions. Th ...
... experiments, data model, and measurement units. Other kinds of metadata are extracted from raw data, possibly through ontologies. Metadata may also denote data relationships and quality. Annotating the data, all metadata (accumulated or extracted) is critical to deducing experimental conclusions. Th ...
Database model
A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.