No Slide Title
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
A Metadata Approach to Resolving Semantic Conflicts
... With the development of complex information systems, the need for the integration of heterogeneous information systems, and the availability of numerous online computer data sources, it has become increasingly important that methods be developed that consider the meaning of the data used in t,hese s ...
... With the development of complex information systems, the need for the integration of heterogeneous information systems, and the availability of numerous online computer data sources, it has become increasingly important that methods be developed that consider the meaning of the data used in t,hese s ...
ch3
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
ppt
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
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 ...
Working with Databases in PHP
... Returns 0 if no ID was generated, false on error Works only for AUTO_INCREMENT columns $link can be omitted if only one link established mysql_query ("insert into people ("name", ...
... Returns 0 if no ID was generated, false on error Works only for AUTO_INCREMENT columns $link can be omitted if only one link established mysql_query ("insert into people ("name", ...
Chapter 12: Indexing and Hashing
... ■ Indices offer substantial benefits when searching for records. ■ BUT: Updating indices imposes overhead on database ...
... ■ Indices offer substantial benefits when searching for records. ■ BUT: Updating indices imposes overhead on database ...
Diagnosing and Tuning Oracle Enterprise Manager
... – These jobs should be active all the time To start the jobs: exec emd_maintenance.submit_em_dbms_jobs; – If repository database maintenance has to be done, they can be temporarily stopped: exec emd_maintenance.remove_em_dbms_jobs; – Check the DBMS Job Status metric for the key performance indicator ...
... – These jobs should be active all the time To start the jobs: exec emd_maintenance.submit_em_dbms_jobs; – If repository database maintenance has to be done, they can be temporarily stopped: exec emd_maintenance.remove_em_dbms_jobs; – Check the DBMS Job Status metric for the key performance indicator ...
eHealth space related issue troubleshooting guide
... Normally the REDO log switches take place every 10-15 minutes. That means about 4 to 6 redo log files would be created in one hour. But sometimes it can create 1 to several redo log files within one minute due to a heavy database activity or a big database transaction. This rapid creation of redo lo ...
... Normally the REDO log switches take place every 10-15 minutes. That means about 4 to 6 redo log files would be created in one hour. But sometimes it can create 1 to several redo log files within one minute due to a heavy database activity or a big database transaction. This rapid creation of redo lo ...
Chapter 3: Relational Model Example of a Relation
... r ÷ s = ∏R-S (r) –∏R-S ( (∏R-S (r) x s) – ∏R-S,S(r)) To see why + ∏R-S,S(r) simply reorders attributes of r + ∏R-S(∏R-S (r) x s) – ∏R-S,S(r)) gives those tuples t in ∏R-S (r) such that for some tuple u ∈ s, tu ∉ r. ...
... r ÷ s = ∏R-S (r) –∏R-S ( (∏R-S (r) x s) – ∏R-S,S(r)) To see why + ∏R-S,S(r) simply reorders attributes of r + ∏R-S(∏R-S (r) x s) – ∏R-S,S(r)) gives those tuples t in ∏R-S (r) such that for some tuple u ∈ s, tu ∉ r. ...
SQL QUERY EVALUATION
... Can also enhance sort-merge joins when at least one relation has an index on the join attributes e.g. one relation is sorted, and the unsorted relation has an index on the join attributes ¤ Traverse unsorted relation’s index in order ¤ When rows match, use index to pull those tuples from disk ¤ Disk ...
... Can also enhance sort-merge joins when at least one relation has an index on the join attributes e.g. one relation is sorted, and the unsorted relation has an index on the join attributes ¤ Traverse unsorted relation’s index in order ¤ When rows match, use index to pull those tuples from disk ¤ Disk ...
Ajax and DB
... // Then perform a query to grab a random word from DB table block // ORDER BY RAND() combined with LIMIT to select a random sample // from a set of rows: $querystr = "SELECT content FROM block ORDER BY RAND() LIMIT 1"; ...
... // Then perform a query to grab a random word from DB table block // ORDER BY RAND() combined with LIMIT to select a random sample // from a set of rows: $querystr = "SELECT content FROM block ORDER BY RAND() LIMIT 1"; ...
Constraint Checking with Partial Information
... update if and only if C holds after the update. The test for whether C holds after the update, given that it and perhaps some other constraints C1; : : :; C held before the update, is to see whether C is contained in C [ C1 [ [ C . When we construct C from C, it may not be possible for C to be ...
... update if and only if C holds after the update. The test for whether C holds after the update, given that it and perhaps some other constraints C1; : : :; C held before the update, is to see whether C is contained in C [ C1 [ [ C . When we construct C from C, it may not be possible for C to be ...
ch3
... temp1 R-S (r) temp2 R-S ((temp1 x s) – R-S,S (r)) result = temp1 – temp2 The result to the right of the is assigned to the relation variable on the left of the . May use variable in subsequent expressions. ...
... temp1 R-S (r) temp2 R-S ((temp1 x s) – R-S,S (r)) result = temp1 – temp2 The result to the right of the is assigned to the relation variable on the left of the . May use variable in subsequent expressions. ...
Effective Usage of SQL Server 2005 Database Mirroring
... • What we will not cover: – Features of each edition & version – Real-time upgrade procedure – Not a specific techie area - Dev & IT PRO ...
... • What we will not cover: – Features of each edition & version – Real-time upgrade procedure – Not a specific techie area - Dev & IT PRO ...
Chapter 4: SQL
... Allows the specification of not only a set of relations but also information about each relation, including: The schema for each relation. The domain of values associated with each attribute. ...
... Allows the specification of not only a set of relations but also information about each relation, including: The schema for each relation. The domain of values associated with each attribute. ...
Install Data Quality Services | Microsoft Docs
... recently installed on your computer. If any pending restarts are found, a message appears to notify you about the same, and you can choose to continue or abort the installation by pressing Y or N respectively. We recommend that if there are any pending restarts, you must abort the installation, rest ...
... recently installed on your computer. If any pending restarts are found, a message appears to notify you about the same, and you can choose to continue or abort the installation by pressing Y or N respectively. We recommend that if there are any pending restarts, you must abort the installation, rest ...
The State of the Art in Distributed Query Processing
... reasons, and they often must do it in order to stay competitive. While much of the infrastructure for distributed data processing is already there (e.g., modern network technology), a number of issues make distributed data processing still a complex undertaking: (1) distributed systems can become ve ...
... reasons, and they often must do it in order to stay competitive. While much of the infrastructure for distributed data processing is already there (e.g., modern network technology), a number of issues make distributed data processing still a complex undertaking: (1) distributed systems can become ve ...
Open Forum Concept - SC32 WG2 Metadata Standards Home Page
... Software Component Registries -- Software Components ...
... Software Component Registries -- Software Components ...
customer-name
... tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the same value as tr on r t has the same value as ts on s ...
... tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the same value as tr on r t has the same value as ts on s ...
True/False Questions
... 3. An historical advantage of using conventional files has been processing speed. They can be optimized for the access of the application. Answer: True Page: 519 LOD: Easy 4. Duplication of data items in multiple files is normally cited as the principal disadvantage of file-based systems. Answer: Tr ...
... 3. An historical advantage of using conventional files has been processing speed. They can be optimized for the access of the application. Answer: True Page: 519 LOD: Easy 4. Duplication of data items in multiple files is normally cited as the principal disadvantage of file-based systems. Answer: Tr ...
kiferComp_348761_ppt19
... • Chain commits the transaction (makes it durable) and starts a new transaction, but does not release locks – Individual transactions do not have to be consistent – Recovery is complicated (as before); rollforward required – No performance gain ...
... • Chain commits the transaction (makes it durable) and starts a new transaction, but does not release locks – Individual transactions do not have to be consistent – Recovery is complicated (as before); rollforward required – No performance gain ...
Microsoft Jet Database Engine
The Microsoft Jet Database Engine is a database engine on which several Microsoft products have been built. A database engine is the underlying component of a database, a collection of information stored on a computer in a systematic way. The first version of Jet was developed in 1992, consisting of three modules which could be used to manipulate a database.Database connect for MicrosoftJET stands for Joint Engine Technology, sometimes being referred to as Microsoft JET Engine or simply Jet. Microsoft Access and Visual Basic use or have used Jet as their underlying database engine. It has since been superseded for general use, however, first by Microsoft Desktop Engine (MSDE), then later by SQL Server Express. For larger database needs, Jet databases can be upgraded (or, in Microsoft parlance, ""up-sized"") to Microsoft's flagship database product, SQL Server.However, this does not mean that a MS Jet (Red) database cannot match MS SQL Server in storage capacity. A 5 billion record MS Jet (Red) database with compression and encryption turned on requires about 1 terabyte of disk storage space, comprising hundreds of (*.mdb) files, each acting as partial table, and not as a database in itself.Over the years, Jet has become almost synonymous with Microsoft Access, to the extent that many people refer to a Jet database as an ""Access database"".