Package `RODBC`
... The argument special = TRUE to sqlColumns returns the column(s) needed to specify a row uniquely. This is intended to form the basis of an SQL WHERE clause for update queries (see sqlUpdate), and what (if anything) it does is DBMS-specific. On many DBMSs it will return the primary keys if present: o ...
... The argument special = TRUE to sqlColumns returns the column(s) needed to specify a row uniquely. This is intended to form the basis of an SQL WHERE clause for update queries (see sqlUpdate), and what (if anything) it does is DBMS-specific. On many DBMSs it will return the primary keys if present: o ...
Object Database Semantics: the Stack
... 3. Communication with developers who must understand the semantics to implement it ...
... 3. Communication with developers who must understand the semantics to implement it ...
IPD - SQL Server - Best IT Documents
... Step 3. Design the SQL Server Database Engine Infrastructure (Continued) The database requirements will be gathered and the database infrastructure will be designed from those requirements to: • Task 2: Determine whether to place the database in an existing instance • A separate instance might be r ...
... Step 3. Design the SQL Server Database Engine Infrastructure (Continued) The database requirements will be gathered and the database infrastructure will be designed from those requirements to: • Task 2: Determine whether to place the database in an existing instance • A separate instance might be r ...
Relational Database Mgmt.System
... The most popular data storage model is the relational database, which grew from the seminal paper "A Relational Model of Data for Large Shared Data Banks," written by Dr. E. F. Codd in 1970. SQL evolved to service the concepts of the relational database model. Dr. Codd defined 13 rules, oddly enough ...
... The most popular data storage model is the relational database, which grew from the seminal paper "A Relational Model of Data for Large Shared Data Banks," written by Dr. E. F. Codd in 1970. SQL evolved to service the concepts of the relational database model. Dr. Codd defined 13 rules, oddly enough ...
Computer Networks
... • Need to Update all Nulls with Actual Values • What if DB is Large? • Potential to Introduce Data Inconsistencies ...
... • Need to Update all Nulls with Actual Values • What if DB is Large? • Potential to Introduce Data Inconsistencies ...
SQL Consolidation Planning - The SQL Server Conference
... Can we mix data and log and TempDb? Many disk groups or one large one? How many disks do we need and what RAID Type? How much cache do I need? Should pay the big bucks for 128GB Tier 0 SSD Cache? SSD, SAS, FC or SATA? ...
... Can we mix data and log and TempDb? Many disk groups or one large one? How many disks do we need and what RAID Type? How much cache do I need? Should pay the big bucks for 128GB Tier 0 SSD Cache? SSD, SAS, FC or SATA? ...
Chapter 15-17: Transaction Management
... increased processor and disk utilization, leading to better transaction throughput E.g. 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 con ...
... increased processor and disk utilization, leading to better transaction throughput E.g. 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 con ...
Oracle Application Express (Web Application Development)
... decentralized databases, such as MS Access, to solve tactical issues Need solutions NOW that they control Often contain business critical data Security, sharing, data accuracy, and high availability are problematic Costs are driven up as hundreds of these systems are created ...
... decentralized databases, such as MS Access, to solve tactical issues Need solutions NOW that they control Often contain business critical data Security, sharing, data accuracy, and high availability are problematic Costs are driven up as hundreds of these systems are created ...
XML and Databases
... • DTD constraints structure of XML data – What elements can occur – What attributes can/must an element have – What subelements can/must occur inside each element, and how many times. ...
... • DTD constraints structure of XML data – What elements can occur – What attributes can/must an element have – What subelements can/must occur inside each element, and how many times. ...
INTEGRATING XML WITH HETEROGENEOUS RELATIONAL
... Abstract: - Over the past few years, XML has become the undisputable lingua franca standard both for semistructured data representation and exchange format over the Internet, and also content management in various ebusiness worlds, especially the B2B and B2C enterprise applications. However, most of ...
... Abstract: - Over the past few years, XML has become the undisputable lingua franca standard both for semistructured data representation and exchange format over the Internet, and also content management in various ebusiness worlds, especially the B2B and B2C enterprise applications. However, most of ...
T - VUB STAR lab
... Each transaction is issued a timestamp when it enters the system. If an older transaction Ti has time-stamp TS(Ti), a new transaction Tj is assigned a later time-stamp TS(Tj) > TS(Ti). The protocol manages concurrent execution such that the timestamps determine the serializability order. There a ...
... Each transaction is issued a timestamp when it enters the system. If an older transaction Ti has time-stamp TS(Ti), a new transaction Tj is assigned a later time-stamp TS(Tj) > TS(Ti). The protocol manages concurrent execution such that the timestamps determine the serializability order. There a ...
ppt - Fordham University Computer and Information Sciences
... Application program interface (e.g., ODBC/JDBC) which allow SQL queries to be sent to a database ...
... Application program interface (e.g., ODBC/JDBC) which allow SQL queries to be sent to a database ...
Chapter 6: Database Recovery Techniques.
... During recovery, all transactions of the commit table are redone and all transactions of active tables are ignored since none of their AFIMs reached the database. It is possible that a commit table transaction may be redone twice but this does not create any inconsistency because of a redone is “ide ...
... During recovery, all transactions of the commit table are redone and all transactions of active tables are ignored since none of their AFIMs reached the database. It is possible that a commit table transaction may be redone twice but this does not create any inconsistency because of a redone is “ide ...
What Are Locks?
... Durability Transactions ensure that multiple data modifications are processed together or not at all The transaction log ensures that updates are complete and recoverable Transactions use locks ...
... Durability Transactions ensure that multiple data modifications are processed together or not at all The transaction log ensures that updates are complete and recoverable Transactions use locks ...
Towards heterogeneous multimedia information systems: the Garlic
... records) which also involve traditional, record-oriented data. In both commercial and more specialized environments, the existing multimedia data often resides in file-based data systems that provide media-specific capabilities for searching, storing, and delivering the (often large) multimedia dat ...
... records) which also involve traditional, record-oriented data. In both commercial and more specialized environments, the existing multimedia data often resides in file-based data systems that provide media-specific capabilities for searching, storing, and delivering the (often large) multimedia dat ...
Sample Profile Providers
... The Profile feature allows definition of the “customProviderData” attribute on each Profile property. If you use the SqlProfileProvider you may not be aware of this attribute since it has no utility with this provider. However the “customProviderData” attribute was included in ASP.NET 2.0 precisely ...
... The Profile feature allows definition of the “customProviderData” attribute on each Profile property. If you use the SqlProfileProvider you may not be aware of this attribute since it has no utility with this provider. However the “customProviderData” attribute was included in ASP.NET 2.0 precisely ...
PowerPoint
... accordingly (e.g. store DOM tree, shred, use XML DB, ...) Pro?: Part of SQL 2003 (SQL/XML extensions) Con: Frankenstein's query language ...
... accordingly (e.g. store DOM tree, shred, use XML DB, ...) Pro?: Part of SQL 2003 (SQL/XML extensions) Con: Frankenstein's query language ...
Slide 1
... purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products re ...
... purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products re ...
Structured Query Language SQL
... 1.1.2. Data Definition (DDL) .............................................................................................................. 3 1.1.3. Data Manipulation (DML) ........................................................................................................ 4 1.1.4. Data control ...
... 1.1.2. Data Definition (DDL) .............................................................................................................. 3 1.1.3. Data Manipulation (DML) ........................................................................................................ 4 1.1.4. Data control ...
PPT file
... •A relation schema R of degree n is denoted by R(A1, A2,…,An). •An n-tuple t in a relation r(R) is denoted by t =, where
vi is the value corresponding to attribute Ai. The components values of
tuples are denoted as:
•Both t[Ai] and t.Ai refer to the value vi in t for attribute Ai.
•B ...
... •A relation schema R of degree n is denoted by R(A1, A2,…,An). •An n-tuple t in a relation r(R) is denoted by t =