Relational Databases
... • In processing a query, a path is traversed in the tree from the root to some leaf node. • If there are K search-key values in the file, the path is no longer than log n/ 2 (K ). • A node is generally the same size as a disk block, typically 4 kilobytes, and n is typically around 100 (40 bytes ...
... • In processing a query, a path is traversed in the tree from the root to some leaf node. • If there are K search-key values in the file, the path is no longer than log n/ 2 (K ). • A node is generally the same size as a disk block, typically 4 kilobytes, and n is typically around 100 (40 bytes ...
The Revolution in Database Architecture
... It is increasingly common to find tables with thousands of columns – they arise when a particular object has thousands of measured attributes. Not infrequently, many of the values are null. For example, an LDAP object has 7 required and a thousand optional attributes. It is convenient to think of ea ...
... It is increasingly common to find tables with thousands of columns – they arise when a particular object has thousands of measured attributes. Not infrequently, many of the values are null. For example, an LDAP object has 7 required and a thousand optional attributes. It is convenient to think of ea ...
Oracle interMedia Oracle interMedia is a feature of Oracle Database
... When the system encounters an error indexing a row, it logs the error in an Oracle Text view. You can view errors on your indexes with CTX_USER_INDEX_ERRORS. View errors on all indexes as CTXSYS with CTX_INDEX_ERRORS. For example to view the most recent errors on your indexes, you can issue: ...
... When the system encounters an error indexing a row, it logs the error in an Oracle Text view. You can view errors on your indexes with CTX_USER_INDEX_ERRORS. View errors on all indexes as CTXSYS with CTX_INDEX_ERRORS. For example to view the most recent errors on your indexes, you can issue: ...
Introduction - University of Toronto
... can lead to inconsistency: e.g., check is cleared while account balance is being computed. DBMS ensures such problems don’t arise: users can pretend they are using a single-user system. ...
... can lead to inconsistency: e.g., check is cleared while account balance is being computed. DBMS ensures such problems don’t arise: users can pretend they are using a single-user system. ...
RDBMS and SQL
... • Can be fired before or after insert, update, delete • Trigger can access values it needs as :OLD. and :NEW. – prefix :OLD refers to values in a tuple deleted or to the values replaced in an update – prefix :NEW refers to the values in a tuple just inserted or to the new values in an update. ...
... • Can be fired before or after insert, update, delete • Trigger can access values it needs as :OLD. and :NEW. – prefix :OLD refers to values in a tuple deleted or to the values replaced in an update – prefix :NEW refers to the values in a tuple just inserted or to the new values in an update. ...
7 Oracle ADDM
... of normal system work. Estimate the effect of each setting on database time. We recommend the best setting based on cost and benefit in database time. ...
... of normal system work. Estimate the effect of each setting on database time. We recommend the best setting based on cost and benefit in database time. ...
Concepts of Database Management Systems 1
... Increased vulnerability (all your eggs in one basket) More difficult recovery (if disaster strikes) ...
... Increased vulnerability (all your eggs in one basket) More difficult recovery (if disaster strikes) ...
Designing Performance-Optimized JDBC Applications
... procedures on the database server either by executing the procedure as a SQL query or by optimizing the execution by invoking a Remote Procedure Call (RPC) directly on the database server. When you execute a stored procedure as a SQL query, the database server parses the statement, validates the arg ...
... procedures on the database server either by executing the procedure as a SQL query or by optimizing the execution by invoking a Remote Procedure Call (RPC) directly on the database server. When you execute a stored procedure as a SQL query, the database server parses the statement, validates the arg ...
Database Management System
... and usually used by a single user. It is usually installed on a PC. The size of such database is 100KB- 100MB. • Typical Professional Database: generally used by SMEs (Small to Medium Enterprises). Their size varies between 100MB and 1TB. • Very Large Database (VLDB): The size of such database ...
... and usually used by a single user. It is usually installed on a PC. The size of such database is 100KB- 100MB. • Typical Professional Database: generally used by SMEs (Small to Medium Enterprises). Their size varies between 100MB and 1TB. • Very Large Database (VLDB): The size of such database ...
Database Systems
... • Data redundancy results in data inconsistency – Different and conflicting versions of the same data appear in different places • Errors more likely to occur when complex entries are made in several different files and/or recur frequently in one or more files • Data anomalies develop when required ...
... • Data redundancy results in data inconsistency – Different and conflicting versions of the same data appear in different places • Errors more likely to occur when complex entries are made in several different files and/or recur frequently in one or more files • Data anomalies develop when required ...
CONCURRENCY CONTROL WITH LOCKING METHODS
... A query processing bottleneck is a delay introduced in the processing of an I/O operation that causes the overall system to slow down. there are five components that typically cause bottlenecks: • CPU. • RAM. • Hard disk. • Network. • Application code. ...
... A query processing bottleneck is a delay introduced in the processing of an I/O operation that causes the overall system to slow down. there are five components that typically cause bottlenecks: • CPU. • RAM. • Hard disk. • Network. • Application code. ...
Technical Note
... However, I have no choice as to how to partition these tables, because the partitioning needs to match the predicates in the application SQL. The SQL contains ‘WHERE EMPLID BETWEEN ...’ predicates, so I have to range partition by EMPLID. This has forced me to archive these tables with DML. The large ...
... However, I have no choice as to how to partition these tables, because the partitioning needs to match the predicates in the application SQL. The SQL contains ‘WHERE EMPLID BETWEEN ...’ predicates, so I have to range partition by EMPLID. This has forced me to archive these tables with DML. The large ...
Distributed Database System
... two or more subsystems that lack any connection between them – Note: a subsystem may consist of a single node Network partitioning and site failures are generally ...
... two or more subsystems that lack any connection between them – Note: a subsystem may consist of a single node Network partitioning and site failures are generally ...
Week 11 (11/13/12): Lecture Notes
... online for best response time Choice of access paths Choice of join orders ...
... online for best response time Choice of access paths Choice of join orders ...
0610DublinSQLDesign
... Microsoft Regional Director and SQL Server MVP Writer/Editor for SQL Magazine www.sqlmag.com Author/Instructor for SQL Server courses: Designing for Performance, Indexing for Performance, Maintenance, Disaster Recovery/HA Author/Manager of SQL Server 2005 Launch Content, Co-author/Manager for SQL Se ...
... Microsoft Regional Director and SQL Server MVP Writer/Editor for SQL Magazine www.sqlmag.com Author/Instructor for SQL Server courses: Designing for Performance, Indexing for Performance, Maintenance, Disaster Recovery/HA Author/Manager of SQL Server 2005 Launch Content, Co-author/Manager for SQL Se ...
SQL 2: GETTING INFORMATION INTO A DATABASE MIS2502
... • The only required field is CustomerID – the rest can be left blank. • CustomerID is defined as the primary key. ...
... • The only required field is CustomerID – the rest can be left blank. • CustomerID is defined as the primary key. ...
DB2 Conversion Assessment Questionnaire
... Visit http://ibm.co/ibmdb2dcw to download DCW and the Oracle to DB2 Conversion Guide. The Conversion Guide provides detailed instructions on how to setup DCW, extract DDL and SQL/PL, as well as how to generate a compatibility evaluation report. Please return this completed questionnaire with either ...
... Visit http://ibm.co/ibmdb2dcw to download DCW and the Oracle to DB2 Conversion Guide. The Conversion Guide provides detailed instructions on how to setup DCW, extract DDL and SQL/PL, as well as how to generate a compatibility evaluation report. Please return this completed questionnaire with either ...
PPTX (Mac)
... Must support concurrent operations Solution: this is hard! (But fortunately doesn’t matter for many applications) ...
... Must support concurrent operations Solution: this is hard! (But fortunately doesn’t matter for many applications) ...
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
... 2. What are the components used for representing E-R diagram? 3. Write a SQL command to display data in descending order. 4. Comment on TCL commands. 5. Define normalizations. 6. Draw the E-R diagram for Inventory application. 7. What are the steps involved in Query processing. 8. Define Equivalence ...
... 2. What are the components used for representing E-R diagram? 3. Write a SQL command to display data in descending order. 4. Comment on TCL commands. 5. Define normalizations. 6. Draw the E-R diagram for Inventory application. 7. What are the steps involved in Query processing. 8. Define Equivalence ...
Overview of Content Providers Creating a Content Provider
... A few considerations to take in mind while creating your database: ...
... A few considerations to take in mind while creating your database: ...
SQL Views Chapter 7 p. 260 -274 in Kroenke textbook
... SQL Views SQL view is a virtual table that is constructed from other tables or views It has no data of its own, but obtains data from tables or other views It only has a definition SELECT statements are used to define views A view definition may not include an ORDER BY clause ...
... SQL Views SQL view is a virtual table that is constructed from other tables or views It has no data of its own, but obtains data from tables or other views It only has a definition SELECT statements are used to define views A view definition may not include an ORDER BY clause ...