Introduction “Structured Query Language” (SQL)
... two tables match. • DISTINCT means that if the same age and address shows up in multiple rows, only the first instance will be displayed. ...
... two tables match. • DISTINCT means that if the same age and address shows up in multiple rows, only the first instance will be displayed. ...
DBA Guide to Databases on VMware
... • Provides a simple and reliable first line of defense for all databases • Can be used in conjunction with Symantec App HA to provide application ...
... • Provides a simple and reliable first line of defense for all databases • Can be used in conjunction with Symantec App HA to provide application ...
Resume - my name is chris tran
... Clinical Trials (using LAMP stack - Linux, Apache, MySQL, PHP) Maintaining and fixing bugs to ensure smooth operational processes are maintained Handling backend database procedures including backing up and loading clients’ old data to new sites Deploying products to clients such as health centres a ...
... Clinical Trials (using LAMP stack - Linux, Apache, MySQL, PHP) Maintaining and fixing bugs to ensure smooth operational processes are maintained Handling backend database procedures including backing up and loading clients’ old data to new sites Deploying products to clients such as health centres a ...
XML Databases for Bioinformatics
... Create a servlet (or CGI) that accesses data through URL parameter list: – Oracle account – Tablename – Unique identifier – Stylesheet – Depth – Query constraints on column ...
... Create a servlet (or CGI) that accesses data through URL parameter list: – Oracle account – Tablename – Unique identifier – Stylesheet – Depth – Query constraints on column ...
Chapter 3 – Database Systems, Data Warehouses, and Data Marts
... database performance, and add and fine-tune database functions. Data Driven Web Site – acts as an interface to a database, retrieving data for users and allowing users to enter data in the database. Distributed Databases – stores data on multiple servers throughout an organization. Fragmentation – a ...
... database performance, and add and fine-tune database functions. Data Driven Web Site – acts as an interface to a database, retrieving data for users and allowing users to enter data in the database. Distributed Databases – stores data on multiple servers throughout an organization. Fragmentation – a ...
Overview of ADO.NET
... The RecordSet object in ADO has been dropped; instead a new object called DataSet is introduced in ADO.NET. The DataSet object is a disconnected collection of one or more tables that are stored in memory. The DataSet is effectively a private copy of the database in the memory, complete with tabl ...
... The RecordSet object in ADO has been dropped; instead a new object called DataSet is introduced in ADO.NET. The DataSet object is a disconnected collection of one or more tables that are stored in memory. The DataSet is effectively a private copy of the database in the memory, complete with tabl ...
Transaction Management - USA School of Computing
... aborted if there is the possibility of a deadlock – Transaction is rolled back, Locks are released, Transaction is rescheduled Detection – Periodically test the database for deadlocks. If a deadlock is found, abort / rollback one of the transactions Avoidance – Requires a transaction to obtain all l ...
... aborted if there is the possibility of a deadlock – Transaction is rolled back, Locks are released, Transaction is rescheduled Detection – Periodically test the database for deadlocks. If a deadlock is found, abort / rollback one of the transactions Avoidance – Requires a transaction to obtain all l ...
sqlite
... SQLiteProgram - A base class for compiled SQLite programs. SQLiteQuery - A SQLite program that represents a query that reads the resulting rows into a CursorWindow. SQLiteQueryBuilder - a convenience class that helps build SQL queries to be sent to SQLiteDatabase objects. SQLiteStatement - A pre-com ...
... SQLiteProgram - A base class for compiled SQLite programs. SQLiteQuery - A SQLite program that represents a query that reads the resulting rows into a CursorWindow. SQLiteQueryBuilder - a convenience class that helps build SQL queries to be sent to SQLiteDatabase objects. SQLiteStatement - A pre-com ...
2 - CWI Amsterdam
... the plan – Hardwired tree rewriting rules are deployed to enumerate part of the space of possible QEP – For each alternative the total cost is determined – The best (alternatives) are retained for execution – Problems: very large space to explore, duplicate plans, local maxima, expensive query cost ...
... the plan – Hardwired tree rewriting rules are deployed to enumerate part of the space of possible QEP – For each alternative the total cost is determined – The best (alternatives) are retained for execution – Problems: very large space to explore, duplicate plans, local maxima, expensive query cost ...
Object-Relational Database Model
... Relational Database Management System (RDBMS) Software Development Kit (SDK) End front tools ...
... Relational Database Management System (RDBMS) Software Development Kit (SDK) End front tools ...
DataGuides: Enabling Query Formulation and
... exists in the database. Similarly, if we traverse the single instance of a label path l in the DataGuide and reach some object o, then the labels on the outgoing edges of o represent all possible labels that could ever follow l in the source database. In Figure 2, the five different labeled outgoing ...
... exists in the database. Similarly, if we traverse the single instance of a label path l in the DataGuide and reach some object o, then the labels on the outgoing edges of o represent all possible labels that could ever follow l in the source database. In Figure 2, the five different labeled outgoing ...
Application - University Of Worcester
... back end provides scripts, etc. to cover all aspects of a transaction including data storage front end interfaces with product pages and uses product selection to pass information to the cart cart itself provides details of the transaction: » Cart data used to create an on-line order and on-li ...
... back end provides scripts, etc. to cover all aspects of a transaction including data storage front end interfaces with product pages and uses product selection to pass information to the cart cart itself provides details of the transaction: » Cart data used to create an on-line order and on-li ...
SQL Coding Best Practices – Focus on Performance
... transaction volume. Same transaction with smaller batch size is used to commit the processed data at regular intervals. By using this coding practice, blocking of other processes when running huge transactions were avoided thus improving the application throughput and performance as well as scalabil ...
... transaction volume. Same transaction with smaller batch size is used to commit the processed data at regular intervals. By using this coding practice, blocking of other processes when running huge transactions were avoided thus improving the application throughput and performance as well as scalabil ...
OO Model and XML
... Particularly useful when objects can be classified in more than one way, which are independent of each other E.g. temporary/permanent is independent of Officer/secretary/teller Create a subclass for each combination of subclasses – Need not create subclasses for combinations that are not possi ...
... Particularly useful when objects can be classified in more than one way, which are independent of each other E.g. temporary/permanent is independent of Officer/secretary/teller Create a subclass for each combination of subclasses – Need not create subclasses for combinations that are not possi ...
\input /u/ullman/doc/nmacs
... • If the relationship is many-one from A to B, put key of B attributes in the relation for class A. • If relationship is many-many, we’ll have to duplicate A-tuples as in ODL with set-valued ...
... • If the relationship is many-one from A to B, put key of B attributes in the relation for class A. • If relationship is many-many, we’ll have to duplicate A-tuples as in ODL with set-valued ...
The Object-Oriented Database System Manifesto Malcolm Atkinson
... [Caruso and Sciore 87], [G-Base 88]. The interest in object-oriented databases seems to be driven by the needs of design support systems (e.g., CAD, CASE, Office Information Systems). These applications require databases that can handle very complex data, that can evolve gracefully, and that can pro ...
... [Caruso and Sciore 87], [G-Base 88]. The interest in object-oriented databases seems to be driven by the needs of design support systems (e.g., CAD, CASE, Office Information Systems). These applications require databases that can handle very complex data, that can evolve gracefully, and that can pro ...
CC2
... Before locking an item, Xact must set “intention locks” on all its ancestors. For unlock, go from specific to general (i.e., bottom-up). SIX mode: Like S & IX at the same time. Scanning the table but ...
... Before locking an item, Xact must set “intention locks” on all its ancestors. For unlock, go from specific to general (i.e., bottom-up). SIX mode: Like S & IX at the same time. Scanning the table but ...
Complexity and Approximation of Fixing Numerical Attributes in
... Most of the research has concentrated on repairs of databases that minimize under set inclusion the set of insertions/deletions of whole database tuples (no matter what type of data they contain) No much interest in the repairs per se or their computation (unless absolutely necessary), but in consis ...
... Most of the research has concentrated on repairs of databases that minimize under set inclusion the set of insertions/deletions of whole database tuples (no matter what type of data they contain) No much interest in the repairs per se or their computation (unless absolutely necessary), but in consis ...
Users and Basic Security
... from sys.gv_$session where sid =(select sid from sys.gv$mystat where rownum = 1); USER SCHEMANAME ------------------------------ -----------------------------SYS SYS SQL> alter session set current_schema = system; select user, schemaname from sys.gv_$session where sid =(select sid from sys.gv$mystat ...
... from sys.gv_$session where sid =(select sid from sys.gv$mystat where rownum = 1); USER SCHEMANAME ------------------------------ -----------------------------SYS SYS SQL> alter session set current_schema = system; select user, schemaname from sys.gv_$session where sid =(select sid from sys.gv$mystat ...
Client/Server Computing (the wave of the future)
... Data-oriented; used only for data storage and management Since a data server can serve more than one compute server, compute-intensive applications can be spread among multiple severs Does not prefer any application logic processing Performs processes such as data validation, required as part of the ...
... Data-oriented; used only for data storage and management Since a data server can serve more than one compute server, compute-intensive applications can be spread among multiple severs Does not prefer any application logic processing Performs processes such as data validation, required as part of the ...
DB administration, Transactions
... locked resource Shared lock (S) - allows other users to read the locked resource, but they cannot update it ...
... locked resource Shared lock (S) - allows other users to read the locked resource, but they cannot update it ...
inconsistent databases
... which semantic constraints have to be imposed; or more generally, a database on which imposing new constrains depending on specific needs, e.g. user constraints, becomes necessary. In the area of data integration the satisfaction of desirable ICs by a database is much more difficult to achieve. One ...
... which semantic constraints have to be imposed; or more generally, a database on which imposing new constrains depending on specific needs, e.g. user constraints, becomes necessary. In the area of data integration the satisfaction of desirable ICs by a database is much more difficult to achieve. One ...
Slide 1
... The only logins it knows for certain have the appropriate rights is the db_owner (by virtue of the information stored in sysdatabases) and those who are assigned to the sysadmin fixed server role (since they have all rights anyway). ...
... The only logins it knows for certain have the appropriate rights is the db_owner (by virtue of the information stored in sysdatabases) and those who are assigned to the sysadmin fixed server role (since they have all rights anyway). ...
Versant Object Database
Versant Object Database (VOD) is an object database software product developed by Versant Corporation.The Versant Object Database enables developers using object oriented languages to transactionally store their information by allowing the respective language to act as the Data Definition Language (DDL) for the database. In other words, the memory model is the database schema model.In general, persistence in VOD in implemented by declaring a list of classes, then providing a transaction demarcation application programming interface to use cases. Respective language integrations adhere to the constructs of that language, including syntactic and directive sugars.Additional APIs exist, beyond simple transaction demarcation, providing for the more advanced capabilities necessary to address practical issues found when dealing with performance optimization and scalability for systems with large amounts of data, many concurrent users, network latency, disk bottlenecks, etc.