1. Introduction to SQL Tuning
... Ø Memory Processes - You must understand the purpose of the shared pool and database buffer cache. Ø Database Objects - It is not possible to tune an SQL statement without understanding indexes! Data storage in tables or clusters can also have an effect. Ø Access Paths - The Oracle optimizer can cho ...
... Ø Memory Processes - You must understand the purpose of the shared pool and database buffer cache. Ø Database Objects - It is not possible to tune an SQL statement without understanding indexes! Data storage in tables or clusters can also have an effect. Ø Access Paths - The Oracle optimizer can cho ...
Drawn to scale by Steve Meng
... alert time for each unit, their arrival times, and their available times. The units table will have the CAD system's identifying number in it so it can be linked to the appropriate incident table record. CAD or recordsmanagement systems have many tables, but the incident and unit tables have the ans ...
... alert time for each unit, their arrival times, and their available times. The units table will have the CAD system's identifying number in it so it can be linked to the appropriate incident table record. CAD or recordsmanagement systems have many tables, but the incident and unit tables have the ans ...
Lecture 7 part 1
... Attribute Domain – the set of permitted values for each attribute Attribute types: – Simple and composite attributes. Eg composite attribute: address consists of street and city. – Single-valued and multi-valued attributes E.g. multivalued attribute: phone-numbers – Derived attributes Can be c ...
... Attribute Domain – the set of permitted values for each attribute Attribute types: – Simple and composite attributes. Eg composite attribute: address consists of street and city. – Single-valued and multi-valued attributes E.g. multivalued attribute: phone-numbers – Derived attributes Can be c ...
Brief Review of the Workforce Information Database
... WID Core Tables • Statewide data • Time series should have the most recent 2 years • Both seasonally and not seasonally adjusted • All time periods as available • Occupational projections at BLS collapsed level • Send license and licauth to NCSC for inclusion in ACINet • CES must have MSA data ...
... WID Core Tables • Statewide data • Time series should have the most recent 2 years • Both seasonally and not seasonally adjusted • All time periods as available • Occupational projections at BLS collapsed level • Send license and licauth to NCSC for inclusion in ACINet • CES must have MSA data ...
Form one
... Creating Queries A query is simply a question you ask a database. How many books are written by a certain author? Who wrote a book in a certain year? Queries select records from one or more tables in a database that match the criteria you set, they can be viewed, analyzed, and sorted on a common da ...
... Creating Queries A query is simply a question you ask a database. How many books are written by a certain author? Who wrote a book in a certain year? Queries select records from one or more tables in a database that match the criteria you set, they can be viewed, analyzed, and sorted on a common da ...
Reading summary
... • Many MapReduce applications complete data manipulation or search tasks that could be done by parallel databases • Compare the performance of parallel databases and MapReduce framework for these data intensive applications ...
... • Many MapReduce applications complete data manipulation or search tasks that could be done by parallel databases • Compare the performance of parallel databases and MapReduce framework for these data intensive applications ...
comp14_unit5_audio_transcript
... The standard user and application program interface to a relational database is the structured query language, or SQL. Slide 11: Hypothetical Relational Database Model This graphic shows a hypothetical Relational Database Model. Separate tables exist for Patient, Physician, and Inpatient Encounter. ...
... The standard user and application program interface to a relational database is the structured query language, or SQL. Slide 11: Hypothetical Relational Database Model This graphic shows a hypothetical Relational Database Model. Separate tables exist for Patient, Physician, and Inpatient Encounter. ...
Draw Back of jdbc Connectivity
... In JDBC, if we open a database connection we need to write in try, and if any exceptions occurred catch block will takers about it, and finally used to close the connections. Actually if we didn’t close the connection in the finally block, then jdbc doesn’t responsible to close that connection In JD ...
... In JDBC, if we open a database connection we need to write in try, and if any exceptions occurred catch block will takers about it, and finally used to close the connections. Actually if we didn’t close the connection in the finally block, then jdbc doesn’t responsible to close that connection In JD ...
Keywords: Database, Deadlock, Distributed
... A Database is systematically organized or structured repository of indexed information that allows easy retrieval, updating, analysis, and output of data. Each database may involve different database management systems and different architectures that distribute the execution of transactions [1]. A ...
... A Database is systematically organized or structured repository of indexed information that allows easy retrieval, updating, analysis, and output of data. Each database may involve different database management systems and different architectures that distribute the execution of transactions [1]. A ...
DBA Guide to Databases on VMware
... • Detects operating system and hardware failures • Automatically restarts failed database virtual machine • Provides a simple and reliable first line of defense for all databases • Can be used in conjunction with Symantec App HA to provide application ...
... • Detects operating system and hardware failures • Automatically restarts failed database virtual machine • Provides a simple and reliable first line of defense for all databases • Can be used in conjunction with Symantec App HA to provide application ...
Normal forms
... that fourth normal form is defined in terms of multivalued dependencies, which correspond to our independent multi-valued facts. Multivalued dependencies, in turn, are defined essentially as relationships which accept the "cross-product" maintenance policy mentioned above. That is, for our example, ...
... that fourth normal form is defined in terms of multivalued dependencies, which correspond to our independent multi-valued facts. Multivalued dependencies, in turn, are defined essentially as relationships which accept the "cross-product" maintenance policy mentioned above. That is, for our example, ...
document
... Only Included in Database Engine what is needed Has power of the Server Faster. Access Plans are already compiled ...
... Only Included in Database Engine what is needed Has power of the Server Faster. Access Plans are already compiled ...
original - Kansas State University
... If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency preserving. Because it is not always possible to achieve both BCNF and dependency preservation, we co ...
... If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency preserving. Because it is not always possible to achieve both BCNF and dependency preservation, we co ...
Temporal Data and The Relational Model
... SSSC and SSSC_SINCE are in 5NF but not 6NF (which is not needed). S_DURING, SNAME_DURING and so on are in 6NF, thus allowing each of the supplier properties NAME, CITY and STATUS, which vary independently of each other over time, to have its own recorded history (by supplier). ...
... SSSC and SSSC_SINCE are in 5NF but not 6NF (which is not needed). S_DURING, SNAME_DURING and so on are in 6NF, thus allowing each of the supplier properties NAME, CITY and STATUS, which vary independently of each other over time, to have its own recorded history (by supplier). ...
DW Tutorial
... Dimensions are categories by which summarized data can be viewed. E.g. a profit summary in a fact table can be viewed by a Time dimension (profit by month, quarter, year), Region dimension (profit by country, state, city), Product dimension (profit for product1, product2). ...
... Dimensions are categories by which summarized data can be viewed. E.g. a profit summary in a fact table can be viewed by a Time dimension (profit by month, quarter, year), Region dimension (profit by country, state, city), Product dimension (profit for product1, product2). ...
Module 2: Authoring Basic Reports
... Can execute any proc/function/assembly in database, or schema (if schema scoped) Equivalent SELECT, INSERT, UPDATE, DELETE permissions introduced as well ...
... Can execute any proc/function/assembly in database, or schema (if schema scoped) Equivalent SELECT, INSERT, UPDATE, DELETE permissions introduced as well ...
File - Data Mining and Soft computing techniques
... mining System, allowing users to interact with the system by specifying a data mining task or a query through a graphical interface. ...
... mining System, allowing users to interact with the system by specifying a data mining task or a query through a graphical interface. ...
) ANSWERS DATABASE DESIGN (H4
... is said to be the control of redundancy. Explain this term and why it is an advantage. (5 marks) Conventional systems store data on the same entity in more than one place leading to wasted space and potential inconsistency However DBMS may still duplicate in a controlled way in order to model data ( ...
... is said to be the control of redundancy. Explain this term and why it is an advantage. (5 marks) Conventional systems store data on the same entity in more than one place leading to wasted space and potential inconsistency However DBMS may still duplicate in a controlled way in order to model data ( ...
mod-7 - Avi Silberschatz
... refer to temporary tables (called transition tables) containing the affected rows ...
... refer to temporary tables (called transition tables) containing the affected rows ...
Chapter 14 Methodology - Conceptual Database Design
... How would you identify attributes from a user’s requirements specification and then associate the attributes with entity or relationship types? In a similar way to identifying entities, we look for nouns or noun phrases in the users’ requirements specification. The attributes can be identified where ...
... How would you identify attributes from a user’s requirements specification and then associate the attributes with entity or relationship types? In a similar way to identifying entities, we look for nouns or noun phrases in the users’ requirements specification. The attributes can be identified where ...
Normalisation
... cannot be broken down into any smaller components all primary keys must remain unique every foreign key must have a matching primary key in its related table. ...
... cannot be broken down into any smaller components all primary keys must remain unique every foreign key must have a matching primary key in its related table. ...
Processing SSAS multidimensional databsaes
... Writes errors to file in log folder when no path specified ...
... Writes errors to file in log folder when no path specified ...
Principles of Good Database Design
... staff members and are required to build systems for non-OR users. They must know how to package OR/business models so that they can be comfortably used by top managers and other co-workers. Real-life decision making often requires building interactive systems, which students must know how to design ...
... staff members and are required to build systems for non-OR users. They must know how to package OR/business models so that they can be comfortably used by top managers and other co-workers. Real-life decision making often requires building interactive systems, which students must know how to design ...
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.