PowerPoint Chapter 10
... – Restores database from given state, usually inconsistent, to previously consistent state – Based on atomic transaction property • All portions of transaction must be treated as single logical unit of work, so all operations must be applied and completed to produce consistent database ...
... – Restores database from given state, usually inconsistent, to previously consistent state – Based on atomic transaction property • All portions of transaction must be treated as single logical unit of work, so all operations must be applied and completed to produce consistent database ...
PPT file
... Following notation is commonly used: •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 t ...
... Following notation is commonly used: •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 =
Document
... Let S and S´ be two schedules with the same set of transactions. S and S´ are view equivalent if the following three conditions are met, for each data item Q, 1. If in schedule S, transaction Ti reads the initial value of Q, then in schedule S’ also transaction Ti must read the initial value of Q. 2 ...
... Let S and S´ be two schedules with the same set of transactions. S and S´ are view equivalent if the following three conditions are met, for each data item Q, 1. If in schedule S, transaction Ti reads the initial value of Q, then in schedule S’ also transaction Ti must read the initial value of Q. 2 ...
Chapter 10
... – Restores database from given state, usually inconsistent, to previously consistent state – Based on atomic transaction property • All portions of transaction must be treated as single logical unit of work, so all operations must be applied and completed to produce consistent database ...
... – Restores database from given state, usually inconsistent, to previously consistent state – Based on atomic transaction property • All portions of transaction must be treated as single logical unit of work, so all operations must be applied and completed to produce consistent database ...
Lesson-C - uob.edu.bh
... An inner join returns rows only if values exist in all tables that are joined. If no values exist for a row in one of the joined tables, the inner join does not retrieve the row. For example suppose you want to retrieve the different locations of the courses included in the COURSE_SECTION table. Thi ...
... An inner join returns rows only if values exist in all tables that are joined. If no values exist for a row in one of the joined tables, the inner join does not retrieve the row. For example suppose you want to retrieve the different locations of the courses included in the COURSE_SECTION table. Thi ...
Database Security: What Students Need to Know
... Database security is a growing concern evidenced by an increase in the number of reported incidents of loss of or unauthorized exposure to sensitive data. As the amount of data collected, retained and shared electronically expands, so does the need to understand database security. The Defense Inform ...
... Database security is a growing concern evidenced by an increase in the number of reported incidents of loss of or unauthorized exposure to sensitive data. As the amount of data collected, retained and shared electronically expands, so does the need to understand database security. The Defense Inform ...
Using Data Guard for Hardware migration - 4 - Indico
... II - Preparation steps – • Needs to be in ARCHIVE LOG mode • Set force logging • Copy $ORACLE_HOME/network/admin/ + spfile to stage directory in Standby DB • Make at least level 1 backup after setting force logging ...
... II - Preparation steps – • Needs to be in ARCHIVE LOG mode • Set force logging • Copy $ORACLE_HOME/network/admin/ + spfile to stage directory in Standby DB • Make at least level 1 backup after setting force logging ...
CSE 562 Database Systems Example DB Constraints, Triggers, Views, Indexes
... • Triggers are either “row-level” or “statementlevel” • FOR EACH ROW indicates row-level; its absence indicates statement-level • Row level triggers: execute once for each modified tuple • Statement-level triggers: execute once for a SQL statement, regardless of how many tuples ...
... • Triggers are either “row-level” or “statementlevel” • FOR EACH ROW indicates row-level; its absence indicates statement-level • Row level triggers: execute once for each modified tuple • Statement-level triggers: execute once for a SQL statement, regardless of how many tuples ...
Storage Schema for Jena1 and Jena2
... The driver is responsible for data definition operations such as database initialization, table creation and deletion, allocating database identifiers Responsible for mapping graph objects between their Java representation and their database encoding. Use a combination of static and dynamicall ...
... The driver is responsible for data definition operations such as database initialization, table creation and deletion, allocating database identifiers Responsible for mapping graph objects between their Java representation and their database encoding. Use a combination of static and dynamicall ...
OLAP2 outline Multi Dimensional Data Model A Sample Data Cube
... indicators and salaries are measures. That means when you takes a particular category of values and each dimension you get combination, on that combination we are calculating the aggregate values for all these measures. The cell contains these aggregated values. As I mentioned earlier if we see the ...
... indicators and salaries are measures. That means when you takes a particular category of values and each dimension you get combination, on that combination we are calculating the aggregate values for all these measures. The cell contains these aggregated values. As I mentioned earlier if we see the ...
PL/SQL Introduction
... Oracle uses work areas (cursors) to execute SQL statements and store processing information. There are two kinds of cursors: • Implicit Cursors: PL/SQL implicitly declares a cursor for all SQL data manipulation statements, including queries that return only one row. • Explicit Cursors: For queries t ...
... Oracle uses work areas (cursors) to execute SQL statements and store processing information. There are two kinds of cursors: • Implicit Cursors: PL/SQL implicitly declares a cursor for all SQL data manipulation statements, including queries that return only one row. • Explicit Cursors: For queries t ...
Introducing Web Applications
... to be regenerated, just like a new page request causes a page to be generated) The database information can be incorporated into the generated page, e.g., a list of products pulled from the database, in response to user entered data. ...
... to be regenerated, just like a new page request causes a page to be generated) The database information can be incorporated into the generated page, e.g., a list of products pulled from the database, in response to user entered data. ...
Oracle Database Backup-and-Recovery Best Practices and New
... – Place FRA on separate storage & store backups, in addition to copy of control file, redo logs, and archived logs, to protect all needed recoveryrelated files from production outages. – When estimating FRA size, if you want to keep: • Control file backups and archived logs – Estimate archived logs ...
... – Place FRA on separate storage & store backups, in addition to copy of control file, redo logs, and archived logs, to protect all needed recoveryrelated files from production outages. – When estimating FRA size, if you want to keep: • Control file backups and archived logs – Estimate archived logs ...
Level 1 - High Point University
... Succeeding in Business with Microsoft Office Access 2003: A Problem-Solving Approach ...
... Succeeding in Business with Microsoft Office Access 2003: A Problem-Solving Approach ...
Performance Tuning
... especially as systems become more standards compliant. • Commonly used performance measures: – Throughput (transactions per second, or tps) – Response time (delay from submission of transaction to return of result) – Availability or mean time to failure ...
... especially as systems become more standards compliant. • Commonly used performance measures: – Throughput (transactions per second, or tps) – Response time (delay from submission of transaction to return of result) – Availability or mean time to failure ...
Week 1, Lecture 1
... OS backup could be copying in 4K chunks Oracle could be changing the block as the OS is backing it up This is called a split or fractured block The block is changing while it is being backed up, and therefore what gets copied could be inconsistent, head and tail might not match To get around this Or ...
... OS backup could be copying in 4K chunks Oracle could be changing the block as the OS is backing it up This is called a split or fractured block The block is changing while it is being backed up, and therefore what gets copied could be inconsistent, head and tail might not match To get around this Or ...
DB312: SQL Server 2005 Manageability SP2 Improvements
... Schema Change now managed in VSTS and TFS Production Database is now “One version of the truth” only for Data DBA doesn’t have access to changes until he/she has deploy or reject choice “One Version of the truth for Schema” is kept under Source Control ...
... Schema Change now managed in VSTS and TFS Production Database is now “One version of the truth” only for Data DBA doesn’t have access to changes until he/she has deploy or reject choice “One Version of the truth for Schema” is kept under Source Control ...
Interfaces to Databases (IDS-3) A Graphical User Interface to
... A Graphical User Interface to the OODBS VODAK on the Basis of Lyberworld There are many approaches for graphical query formulation. These differ in the degree the users can influence the query composition process. Sometimes, the users are given a graphical metaphor with an expressiveness similar to ...
... A Graphical User Interface to the OODBS VODAK on the Basis of Lyberworld There are many approaches for graphical query formulation. These differ in the degree the users can influence the query composition process. Sometimes, the users are given a graphical metaphor with an expressiveness similar to ...
Whatever - La Salle University
... A fields or set of fields that can be used to uniquely identify all of the rows in a table is known as a key. A key should not have any extraneous fields. E.g. if SocSecNum uniquely identifies a person, then you don’t need SocSecNum and LastName. A table may have more than one field or set o ...
... A fields or set of fields that can be used to uniquely identify all of the rows in a table is known as a key. A key should not have any extraneous fields. E.g. if SocSecNum uniquely identifies a person, then you don’t need SocSecNum and LastName. A table may have more than one field or set o ...
Install Guide for SQL Server 2008 - DaaS (Data as a Service) offering
... need Local Administrator privileges. For a remote installation, you will need Operating System Administrator privileges. If you are on a workgroup network you will need Administrator rights on the domain. To configure databases and install data, you will need Database Administration privileges. A ne ...
... need Local Administrator privileges. For a remote installation, you will need Operating System Administrator privileges. If you are on a workgroup network you will need Administrator rights on the domain. To configure databases and install data, you will need Database Administration privileges. A ne ...
Chapter 6: Integrity Constraints
... • If there is a chain of foreign-key dependencies across multiple relations, with on delete cascade specified for each dependency, a deletion or update at one end of the chain can propagate across the entire chain. • If a cascading update or delete causes a constraint violation that cannot be handle ...
... • If there is a chain of foreign-key dependencies across multiple relations, with on delete cascade specified for each dependency, a deletion or update at one end of the chain can propagate across the entire chain. • If a cascading update or delete causes a constraint violation that cannot be handle ...