9iR2_DBAII_L14
... • The redo log contained information from 11:34 a.m. • Twenty-six minutes of data will be lost. • Users can recover their data. ...
... • The redo log contained information from 11:34 a.m. • Twenty-six minutes of data will be lost. • Users can recover their data. ...
Data Streams and Data Stream Management Systems
... where all the relevant data is kept and whose updates are relatively rare (almost true for traditional relational databases but not for data streams). This approach has a negative trend on performance if there are many rules to be processed (more than a given threshold) or when the data arrival rate ...
... where all the relevant data is kept and whose updates are relatively rare (almost true for traditional relational databases but not for data streams). This approach has a negative trend on performance if there are many rules to be processed (more than a given threshold) or when the data arrival rate ...
Database_performance
... primary key is, by definition, unique. • However, if ranges of rows frequently are selected and ordered by primary key value, a clustering index may be beneficial. ISEL-DEETC-SSTI - Lara Santos ...
... primary key is, by definition, unique. • However, if ranges of rows frequently are selected and ordered by primary key value, a clustering index may be beneficial. ISEL-DEETC-SSTI - Lara Santos ...
cdc0dc5b63d175a5854d6eff40e43a06
... • a waste of memory • high update cost • data inconsistency • Data Incompleteness • Data Insecure • Application Program Unstable • file system (application program) data changed data structure changed program changed Wei-Pang Yang, Information Management, NDHU ...
... • a waste of memory • high update cost • data inconsistency • Data Incompleteness • Data Insecure • Application Program Unstable • file system (application program) data changed data structure changed program changed Wei-Pang Yang, Information Management, NDHU ...
JDBC (Java DataBase Connectivity)
... con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); String query = “select students from class where type=‘not sleeping’ “; ResultSet rs = stmt.executeQuery( query ); rs.previous(); / / go back in the RS (not possible in JDBC 1…) rs.relative(-5); / / go 5 records back ...
... con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); String query = “select students from class where type=‘not sleeping’ “; ResultSet rs = stmt.executeQuery( query ); rs.previous(); / / go back in the RS (not possible in JDBC 1…) rs.relative(-5); / / go 5 records back ...
databaseName
... Access Informix from REST API Clients Directly connect applications or devices that communicate through the REST API to Informix – No client side drivers needed, freedom from client dependency – Web based applications can connect seamlessly to the database using HTTP protocol – Create connections ...
... Access Informix from REST API Clients Directly connect applications or devices that communicate through the REST API to Informix – No client side drivers needed, freedom from client dependency – Web based applications can connect seamlessly to the database using HTTP protocol – Create connections ...
Hibernate
... (OO) programming languages (e.g. Java) and back ORM can be viewed as the automated and transparent persistence of objects in a Java application to the database tables in an RDBMS using metadata that describes the mapping between the objects and the database ...
... (OO) programming languages (e.g. Java) and back ORM can be viewed as the automated and transparent persistence of objects in a Java application to the database tables in an RDBMS using metadata that describes the mapping between the objects and the database ...
Database System Architectures
... interconnection network, and do not share disks or memory with each other. Each node of the system could be a shared-memory system with a few ...
... interconnection network, and do not share disks or memory with each other. Each node of the system could be a shared-memory system with a few ...
Practical Relational Database Design
... » Foreign keys and what they reference (we will see soon what this means) » Additional constraints ...
... » Foreign keys and what they reference (we will see soon what this means) » Additional constraints ...
Web Data Mining for Quenching Analysis
... Data Mining consists of finding interesting patterns and trends in large data sets in order to guide decisions about future activities [5,6]. It is related to areas of Statistics such as Exploratory Data Analysis and fields of Artificial Intelligence [14,15] such as Knowledge Discovery, Expert Syste ...
... Data Mining consists of finding interesting patterns and trends in large data sets in order to guide decisions about future activities [5,6]. It is related to areas of Statistics such as Exploratory Data Analysis and fields of Artificial Intelligence [14,15] such as Knowledge Discovery, Expert Syste ...
What`s A Data warehouse
... Typical relational databases are designed for on-line transactional processing (OLTP) and do not meet the requirements for effective on-line analytical processing (OLAP). As a result, data warehouses are designed differently than traditional relational databases. What is ODS? 1. ODS means Operationa ...
... Typical relational databases are designed for on-line transactional processing (OLTP) and do not meet the requirements for effective on-line analytical processing (OLAP). As a result, data warehouses are designed differently than traditional relational databases. What is ODS? 1. ODS means Operationa ...
Data Warehouse Operational Architecture
... The metadata developed into the database component of the reporting system will contain both functional information to highlight the analytical perspective regarding the meaning of data and relationships between them, as well as technical information. The data warehouse database holds all the detail ...
... The metadata developed into the database component of the reporting system will contain both functional information to highlight the analytical perspective regarding the meaning of data and relationships between them, as well as technical information. The data warehouse database holds all the detail ...
JDBC (Java DataBase Connectivity)
... your system a Data Source Name (DSN) that represents the target database. When Java first came out, this was a useful driver because most databases only supported ODBC access but now this type of driver is recommended only for experimental use or when no other alternative is available. The JDBC-ODBC ...
... your system a Data Source Name (DSN) that represents the target database. When Java first came out, this was a useful driver because most databases only supported ODBC access but now this type of driver is recommended only for experimental use or when no other alternative is available. The JDBC-ODBC ...
Assess Oracle`s Role in the Enterprise Database Strategy
... Determine Oracle’s fit with your organization’s size & complexity Large organizations, or those with complex database requirements, will benefit most from Oracle over other database options. • An Info-Tech survey found that large organizations are more satisfied with Oracle (performance, availabili ...
... Determine Oracle’s fit with your organization’s size & complexity Large organizations, or those with complex database requirements, will benefit most from Oracle over other database options. • An Info-Tech survey found that large organizations are more satisfied with Oracle (performance, availabili ...
Slides from Lecture 6 - Courses - University of California, Berkeley
... – Same as relational, but what new datatypes might be needed or useful (more on OR later) IS 257 – Spring 2004 ...
... – Same as relational, but what new datatypes might be needed or useful (more on OR later) IS 257 – Spring 2004 ...
Database Access in Mobile Environments
... of information are used to realize his access. Localization of data in a world-wide environment and the resourcespecific preparation of this information is a typical requirement for mobile information access. Current database systems, even distributed ones, do not support these features in an adequa ...
... of information are used to realize his access. Localization of data in a world-wide environment and the resourcespecific preparation of this information is a typical requirement for mobile information access. Current database systems, even distributed ones, do not support these features in an adequa ...
ADO in JavaScript (AdoJS) - Yen
... AbsolutePage: Page of current position AbsolutePosition: The original position of the current record ActiveConnection: Active connection object BOF: Before of first record ( True or False ) Bookmark: Return/set a bookmark CacheSize: Number of records cached CursorLocation: Server, client, or client ...
... AbsolutePage: Page of current position AbsolutePosition: The original position of the current record ActiveConnection: Active connection object BOF: Before of first record ( True or False ) Bookmark: Return/set a bookmark CacheSize: Number of records cached CursorLocation: Server, client, or client ...
ppt
... Repeatedly do the following till the end of the relation: (a) Read M blocks of relation into memory (b) Sort the in-memory blocks (c) Write sorted data to run Ri; increment i. Let the final value of i be N 2. Merge the runs (next slide)….. ...
... Repeatedly do the following till the end of the relation: (a) Read M blocks of relation into memory (b) Sort the in-memory blocks (c) Write sorted data to run Ri; increment i. Let the final value of i be N 2. Merge the runs (next slide)….. ...
Document
... The phenomenon of uncommitted data occurs when two transactions, T1 and T2, are executed concurrently and the first transaction (T1) is rolled back after the second transaction (T2) has already accessed the uncommitted data—thus violating the isolation property of transactions. T1 is forced to roll ...
... The phenomenon of uncommitted data occurs when two transactions, T1 and T2, are executed concurrently and the first transaction (T1) is rolled back after the second transaction (T2) has already accessed the uncommitted data—thus violating the isolation property of transactions. T1 is forced to roll ...
Microsoft SQL Server I/O Internals
... stalled and stuck I/O operations (applies to SQL Server 2005) KB828339 - Error message 823 may indicate hardware problems or system problems in SQL Server KB167711 - Understanding Bufwait and Writelog Timeout Messages KB815436 - Use Trace Flag 3505 to Control SQL Server Checkpoint Behavior KB906121 ...
... stalled and stuck I/O operations (applies to SQL Server 2005) KB828339 - Error message 823 may indicate hardware problems or system problems in SQL Server KB167711 - Understanding Bufwait and Writelog Timeout Messages KB815436 - Use Trace Flag 3505 to Control SQL Server Checkpoint Behavior KB906121 ...
ERC+: an object+relationship paradigm for database applications
... known as the first normal form rule). An object in a relation (a tuple) is a list of atomic values. Composite attributes are not allowed: for instance, it is not possible to specify a date attribute as composed of day, month and year attributes. Multivalued attributes are not allowed: for instance, ...
... known as the first normal form rule). An object in a relation (a tuple) is a list of atomic values. Composite attributes are not allowed: for instance, it is not possible to specify a date attribute as composed of day, month and year attributes. Multivalued attributes are not allowed: for instance, ...
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.