Primary Key
... It must be a PK in the related table (We call this enforcing Referential Integrity) ...
... It must be a PK in the related table (We call this enforcing Referential Integrity) ...
Advanced Distributed Software Architectures and Technology group
... Application programs have bugs!!! System still has to be reliable!!!! – Fail cleanly (maintain data integrity) – Recover from transient errors – Recover after system failure Advanced Distributed Software Architectures and Technology group ...
... Application programs have bugs!!! System still has to be reliable!!!! – Fail cleanly (maintain data integrity) – Recover from transient errors – Recover after system failure Advanced Distributed Software Architectures and Technology group ...
Decision Tree Construction
... happens, or nothing • Consistency: The inventory and internal accounts are updated correctly • Isolation: It does not matter whether other customers are also currently making a purchase • Durability: Once you have received the order confirmation number, your order information is permanent, even if t ...
... happens, or nothing • Consistency: The inventory and internal accounts are updated correctly • Isolation: It does not matter whether other customers are also currently making a purchase • Durability: Once you have received the order confirmation number, your order information is permanent, even if t ...
Developing Tightly-Coupled Data Mining Applications
... motivation. Stored procedures in commercial database products have been designedfor the same purpose. For example, Oracle provides a facility to create and store procedures written in PL/SQL as named objects in the database to reduce the amount of information sent over a network. Alternatively, an a ...
... motivation. Stored procedures in commercial database products have been designedfor the same purpose. For example, Oracle provides a facility to create and store procedures written in PL/SQL as named objects in the database to reduce the amount of information sent over a network. Alternatively, an a ...
Maintenance
... • Integrity check can correct minor errors automatically • May have to restore data from backup if major integrity error is found (very rare!) ...
... • Integrity check can correct minor errors automatically • May have to restore data from backup if major integrity error is found (very rare!) ...
DB-Shuttle™ Automation Technology
... DB-Shuttle is not a “database simulator”. It is designed for complete intelligent conversion with rules and code generation leaving no references to legacy technologies. DB-Shuttle is not a “mass changer” that simply replaces one group of legacy code with another group of code. It contains the intel ...
... DB-Shuttle is not a “database simulator”. It is designed for complete intelligent conversion with rules and code generation leaving no references to legacy technologies. DB-Shuttle is not a “mass changer” that simply replaces one group of legacy code with another group of code. It contains the intel ...
Document
... If database crashes during backup. If binaries are destroyed. If entire database server has to be replaced. If SAN loses multiple drives. If database crashes during table movement. If database crashes during use of Flashback ...
... If database crashes during backup. If binaries are destroyed. If entire database server has to be replaced. If SAN loses multiple drives. If database crashes during table movement. If database crashes during use of Flashback ...
SSDT Deployments
... Take Ops out of the way so if issues arise, the development team can troubleshoot the issue first and then use Ops as a last resort ...
... Take Ops out of the way so if issues arise, the development team can troubleshoot the issue first and then use Ops as a last resort ...
Relational Databases and Enterprise Systems
... • Reports are used to integrate data from one or more queries and tables to provide useful information to decision makers. • Pages, Web-based forms, allow data to be entered into the database in real time from outside of the database system. • Macros are defined by users to automate processes like o ...
... • Reports are used to integrate data from one or more queries and tables to provide useful information to decision makers. • Pages, Web-based forms, allow data to be entered into the database in real time from outside of the database system. • Macros are defined by users to automate processes like o ...
Database
... A database management system or DBMS consists of a group of programs that manipulate the data within a database. It provides an interface between the database and the user, or the database and application programs. ...
... A database management system or DBMS consists of a group of programs that manipulate the data within a database. It provides an interface between the database and the user, or the database and application programs. ...
Reviewing requirements Compiling a Complete
... focus on specific subjects, use closed questions to obtain specific details on a certain subject. You can identify subjects by looking for nouns within the sentences that make up the responses. Subjects are always represented by nouns and identify an object or an event. You can then use these subjec ...
... focus on specific subjects, use closed questions to obtain specific details on a certain subject. You can identify subjects by looking for nouns within the sentences that make up the responses. Subjects are always represented by nouns and identify an object or an event. You can then use these subjec ...
Kroenke-DBP-e10-PPT-Chapter01
... of possibly 25% per year.” Connolly, Begg. P. 70 • A relation is viewed as a two dimensional table of data where columns are the attributes of the data and rows, or tuples, contain records of the ...
... of possibly 25% per year.” Connolly, Begg. P. 70 • A relation is viewed as a two dimensional table of data where columns are the attributes of the data and rows, or tuples, contain records of the ...
Document
... Data independence: Application programs not dependent on data representation and storage details Data sharing: data is better utilized (discovered and reused), redundancy of data is minimized Data integrity and consistency: one may enforce consistency constraints on data, e.g., number of seats sold ...
... Data independence: Application programs not dependent on data representation and storage details Data sharing: data is better utilized (discovered and reused), redundancy of data is minimized Data integrity and consistency: one may enforce consistency constraints on data, e.g., number of seats sold ...
DDL,DCL and DML
... This constraint can be set for the field that acts as an identifier A field with primary key constraint will not accept “duplicate” and NULL values Unique: ...
... This constraint can be set for the field that acts as an identifier A field with primary key constraint will not accept “duplicate” and NULL values Unique: ...
World`s Largest OLTP Systems
... (control users and the resources they use) • Monitoring and alerts • Scale gradually (staggered loads on a schedule…) • Benchmarks (after each Scaling Point) ...
... (control users and the resources they use) • Monitoring and alerts • Scale gradually (staggered loads on a schedule…) • Benchmarks (after each Scaling Point) ...
Databases - Pub HTML5
... • Current relational DBMS products not designed for large, multi-server systems • NoSQL databases – Dynamo (elastic), Bigtable (elastic), Cassandra (used by Facebook, Twitter, Digg, Reddit) • Amazon: Dynamo • Google: Bigtable processes petabytes of data on hundreds of thousands of servers Copyright ...
... • Current relational DBMS products not designed for large, multi-server systems • NoSQL databases – Dynamo (elastic), Bigtable (elastic), Cassandra (used by Facebook, Twitter, Digg, Reddit) • Amazon: Dynamo • Google: Bigtable processes petabytes of data on hundreds of thousands of servers Copyright ...
Spring 2002 Transaction Information Systems
... • Aborted, after the transaction has been rolled back and the database restored to its state prior to the start of the transaction. Two options after it has been aborted: – restart the transaction – only if no internal logical error – kill the transaction • Committed, after successful completion. ...
... • Aborted, after the transaction has been rolled back and the database restored to its state prior to the start of the transaction. Two options after it has been aborted: – restart the transaction – only if no internal logical error – kill the transaction • Committed, after successful completion. ...
Chapter 14: Concurrency Control
... avoid this, follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are ...
... avoid this, follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are ...
chapter_07
... – Passenger Safety, Pedestrian and Environmental • These standards govern each stage of manufacturing process from design to final production. • The company needs to obtain many thousands of different approvals each year to comply with the standards. • Overlooking just one means the company cannot s ...
... – Passenger Safety, Pedestrian and Environmental • These standards govern each stage of manufacturing process from design to final production. • The company needs to obtain many thousands of different approvals each year to comply with the standards. • Overlooking just one means the company cannot s ...
Practical Database Design and Tuning
... →Existing tables may be joined (denormalized) because certain attributes from two or more tables are frequently needed together. →For the given set of tables, there may be alternative design choices, all of which achieve 3NF or BCNF. One may be replaced by the other. →A relation of the form R(K, A, ...
... →Existing tables may be joined (denormalized) because certain attributes from two or more tables are frequently needed together. →For the given set of tables, there may be alternative design choices, all of which achieve 3NF or BCNF. One may be replaced by the other. →A relation of the form R(K, A, ...
IMS1907 Database Systems
... – design of DB and environment for adequate performance with large number of users and user transactions – security protecting against unauthorised access to or distribution of sensitive data – which DB and application development tools are appropriate for complex environment? Monash University 2004 ...
... – design of DB and environment for adequate performance with large number of users and user transactions – security protecting against unauthorised access to or distribution of sensitive data – which DB and application development tools are appropriate for complex environment? Monash University 2004 ...
SIGIR01 - Information retrieval
... Mapped scores are usually combined using linear weighting. Performance improvement about 5 to 10%. Search engines need to be similar in performance » May explain why simple normalization schemes work. ...
... Mapped scores are usually combined using linear weighting. Performance improvement about 5 to 10%. Search engines need to be similar in performance » May explain why simple normalization schemes work. ...