Chapter 7: Relational Database Design
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
Query Engine
... Some features of a Query Engine are costly to implement. If those features are needed only a couple of times, they may not be worth the effort. Developers may create Queries that show performance problems because the developers are not conversant enough with limitations of the underlying database sy ...
... Some features of a Query Engine are costly to implement. If those features are needed only a couple of times, they may not be worth the effort. Developers may create Queries that show performance problems because the developers are not conversant enough with limitations of the underlying database sy ...
Chapter 7: Relational Database Design
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
The Pyrrho Book - The Pyrrho DBMS
... Chapter 5 Locking vs Optimistic Transactions................................................................... 43 5.1 A scenario of transaction conflict ............................................................................... 43 5.2 Transactions and Locking Protocols ........................ ...
... Chapter 5 Locking vs Optimistic Transactions................................................................... 43 5.1 A scenario of transaction conflict ............................................................................... 43 5.2 Transactions and Locking Protocols ........................ ...
One-Copy Serializability with Snapshot Isolation under
... database engines, such as Oracle, PostgreSQL, and Microsoft SQL Server. Moreover, in some systems that do not implement two-phase locking (2PL) schemes, including Oracle and PostgreSQL, SI is the strongest available isolation level. Snapshot isolation has attractive performance properties when compa ...
... database engines, such as Oracle, PostgreSQL, and Microsoft SQL Server. Moreover, in some systems that do not implement two-phase locking (2PL) schemes, including Oracle and PostgreSQL, SI is the strongest available isolation level. Snapshot isolation has attractive performance properties when compa ...
(A) R
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
... and F logically implies (F – { }) {( – A) }. Attribute A is extraneous in if A and the set of functional dependencies (F – { }) { ( – A)} logically implies F. Note: implication in the opposite direction is trivial in each of ...
Oracle, SAP and MS SQL on Vblock System 540
... Solution Overview The goal of this work to was to build, test, and document a near-real life enterprise computing environment consisting of several well-known business applications all running on a single converged infrastructure platform. When dealing with mixed or even individual workloads, the pr ...
... Solution Overview The goal of this work to was to build, test, and document a near-real life enterprise computing environment consisting of several well-known business applications all running on a single converged infrastructure platform. When dealing with mixed or even individual workloads, the pr ...
Expression and Enforcement of Dynamic Integrity Constraints
... checked by inspecting the most recent state of a database (knowledge base). For example, the constraint "salaries never decrease" refers to objects (here salaries) of former states of the database. On the other hand, the uniqueness of social security numbers can be checked by inspecting the most rec ...
... checked by inspecting the most recent state of a database (knowledge base). For example, the constraint "salaries never decrease" refers to objects (here salaries) of former states of the database. On the other hand, the uniqueness of social security numbers can be checked by inspecting the most rec ...
Database Programming in SQL/Oracle
... between entities. It is given as a triple (B, {RO1 : E1 , . . . , ROk : Ek }, {A1 , . . . , An }), where B is the name, {RO1 , . . . , ROk }, k ≥ 2, is a list of roles, {E1 , . . . , Ek } is a list of entity types associated to the roles, and {A1 , . . . , An }, n ≥ 0 is the set of attributes of the ...
... between entities. It is given as a triple (B, {RO1 : E1 , . . . , ROk : Ek }, {A1 , . . . , An }), where B is the name, {RO1 , . . . , ROk }, k ≥ 2, is a list of roles, {E1 , . . . , Ek } is a list of entity types associated to the roles, and {A1 , . . . , An }, n ≥ 0 is the set of attributes of the ...
Dealing with inconsistent and incomplete data in a semantic
... record(s) in a tabular format. Such retrieved records can consist of many rows where each row contains an object and the associated fields (columns). However, a large set of records retrieved from a noisy data set may be wrongly analysed. For example, a data analyst may ascribe inconsistent data as ...
... record(s) in a tabular format. Such retrieved records can consist of many rows where each row contains an object and the associated fields (columns). However, a large set of records retrieved from a noisy data set may be wrongly analysed. For example, a data analyst may ascribe inconsistent data as ...
Chapter 7: Relational Database Design
... To preserve integrity of data, the database system must ensure: Atomicity. Either all operations of the transaction are properly reflected in the database or none are. Consistency. Execution of a transaction in isolation preserves the consistency of the database. Isolation. Although multiple t ...
... To preserve integrity of data, the database system must ensure: Atomicity. Either all operations of the transaction are properly reflected in the database or none are. Consistency. Execution of a transaction in isolation preserves the consistency of the database. Isolation. Although multiple t ...
Oracle® Transparent Gateway for Microsoft SQL Server
... The Programs are not intended for use in any nuclear, aviation, mass transit, medical, or other inherently dangerous applications. It shall be the licensee's responsibility to take all appropriate fail-safe, backup, redundancy and other measures to ensure the safe use of such applications if the Pro ...
... The Programs are not intended for use in any nuclear, aviation, mass transit, medical, or other inherently dangerous applications. It shall be the licensee's responsibility to take all appropriate fail-safe, backup, redundancy and other measures to ensure the safe use of such applications if the Pro ...
by Lester Knutsen - Advanced DataTools
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
as a PDF
... sake of scientific accuracy and precision, or for background information to a point of technology analysis, or to provide an example of a technology for illustrative purposes and should not be construed as either positive or negative commentary on that product or that vendor. Neither the inclusion o ...
... sake of scientific accuracy and precision, or for background information to a point of technology analysis, or to provide an example of a technology for illustrative purposes and should not be construed as either positive or negative commentary on that product or that vendor. Neither the inclusion o ...
Temporal Databases
... as being a key enabler of temporal and other applications, including generic applications such as “time series”, “valid time history” and “transaction time history”. I have devoted much effort to the discovery and promulgation of those research results that claim to show that solutions to all of the ...
... as being a key enabler of temporal and other applications, including generic applications such as “time series”, “valid time history” and “transaction time history”. I have devoted much effort to the discovery and promulgation of those research results that claim to show that solutions to all of the ...
PROC SQL: From SELECT to Pass-Through SQL
... controlled by MODELs, BY groups, and OPTIONS, PROC SQL actually exposes an entire, highly flexible language (Structured Query Language – SQL) to the SAS programmer—acting as the SAS System's SQL engine and accepting any ANSI-standard SQL statement. PROC SQL has grown in popularity since its introduc ...
... controlled by MODELs, BY groups, and OPTIONS, PROC SQL actually exposes an entire, highly flexible language (Structured Query Language – SQL) to the SAS programmer—acting as the SAS System's SQL engine and accepting any ANSI-standard SQL statement. PROC SQL has grown in popularity since its introduc ...
Oracle GoldenGate Performance Best Practices ORACLE GOLDENGATE PERFORMANCE BEST PRACTICES
... The primary function of the Data Pump is to read the trail files created by Extract and copy them to the target host. To increase performance of the Data Pump when table names and table structures are not altered or data is being filtered, use the PASSTHRU parameter in the Data Pump parameter file. ...
... The primary function of the Data Pump is to read the trail files created by Extract and copy them to the target host. To increase performance of the Data Pump when table names and table structures are not altered or data is being filtered, use the PASSTHRU parameter in the Data Pump parameter file. ...
insert into DARBINIEKI values (1, `Koks`, 500)
... In Figure 3-1, the root branch block has an entry 0-40, which points to the leftmost block in the next branch level. This branch block contains entries such as 0-10 and 11-19. Each of these entries points to a leaf block that contains key values that fall in the range. A B-tree index is balanced be ...
... In Figure 3-1, the root branch block has an entry 0-40, which points to the leftmost block in the next branch level. This branch block contains entries such as 0-10 and 11-19. Each of these entries points to a leaf block that contains key values that fall in the range. A B-tree index is balanced be ...
Oracle PL/SQL FAQ
... is considered "mutating" and raises an error since Oracle should not return data that has not yet reached its final state. Another way this error can occur is if the trigger has statements to change the primary, foreign or unique key columns of the table off which it fires. If you must have triggers ...
... is considered "mutating" and raises an error since Oracle should not return data that has not yet reached its final state. Another way this error can occur is if the trigger has statements to change the primary, foreign or unique key columns of the table off which it fires. If you must have triggers ...
cs610a - Arms-A-Flailing | Contain Yourself!
... – Wal-Mart : records every item purchased in every store – L. L. Bean: records detail information of each customer and their purchases – Hospitals: record patient demographics, conditions and progress, test results, etc ...
... – Wal-Mart : records every item purchased in every store – L. L. Bean: records detail information of each customer and their purchases – Hospitals: record patient demographics, conditions and progress, test results, etc ...
PPT
... ACID Properties A transaction is a unit of program execution that accesses and possibly updates various data items.To preserve the integrity of data the database system must ensure: Atomicity. Either all operations of the transaction are properly reflected ...
... ACID Properties A transaction is a unit of program execution that accesses and possibly updates various data items.To preserve the integrity of data the database system must ensure: Atomicity. Either all operations of the transaction are properly reflected ...
Paper on ODBC
... current drivers have different conformance levels, which are not documented very well. The ODBC layers present a lot of overhead and they are not known to be very fast [9]. Also ODBC does not specify the communication framework because it only specifies the application protocol. Thus ODBC inherits t ...
... current drivers have different conformance levels, which are not documented very well. The ODBC layers present a lot of overhead and they are not known to be very fast [9]. Also ODBC does not specify the communication framework because it only specifies the application protocol. Thus ODBC inherits t ...
DB2 Web Adapter for Microsoft SQL Server
... Choosing External SQL Scripts from the drop-down list enables you to represent an SQL Query as a synonym for read-only reporting. A Synonym candidate can be any file that contains one (and only one) valid SQL Query and does not contain end-of-statement delimiters (";" or "/") and comments. Depending ...
... Choosing External SQL Scripts from the drop-down list enables you to represent an SQL Query as a synonym for read-only reporting. A Synonym candidate can be any file that contains one (and only one) valid SQL Query and does not contain end-of-statement delimiters (";" or "/") and comments. Depending ...