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Chapter 3 Notes
Chapter 3 Notes

...  Consider each pair of tuples tr from r and ts from s.  If tr and ts have the same value on each of the attributes in R  S, add a tuple t to the result, where  t has the same value as t on r ...
item_name, color
item_name, color

... Procedures and functions can be invoked also from dynamic SQL  SQL:1999 allows more than one function/procedure of the same name (called name overloading), as long as the number of arguments differ, or at least the types of the arguments differ Database System Concepts - 6th Edition ...
Guided Test Generation for Database Applications via Synthesized
Guided Test Generation for Database Applications via Synthesized

... ABSTRACT Testing database applications typically requires the generation of tests consisting of both program inputs and database states. Recently, a testing technique called Dynamic Symbolic Execution (DSE) has been proposed to reduce manual effort in test generation for software applications. Howev ...
- Courses - University of California, Berkeley
- Courses - University of California, Berkeley

... Database includes over 600,000 records of California plant sightings from many federal, state, and private sources. The botanical databases are linked to our CalPhotos collection of Calfornia plants, and are also linked to external collections of data, maps, and photos. ...
No Slide Title - Department of Computer Science
No Slide Title - Department of Computer Science

... Relations are Unordered  Order of tuples is irrelevant (tuples may be stored in an arbitrary order)  E.g. account relation with unordered tuples ...
Database Performance Study - Information Systems Department
Database Performance Study - Information Systems Department

... of different ways to correctly process the query. The best execution plan chosen by the query optimizer is called the query execution plan (QEP). To show some of the complexities involved, a few examples have been included in appendix 3. ...
5. Advanced SQL
5. Advanced SQL

... "select * from instructor where name = ’" + name + "’"  Suppose the user, instead of entering a name, enters:  X’ or ’Y’ = ’Y  then the resulting statement becomes: ...
Answers to Chapters 7, 9 and 10
Answers to Chapters 7, 9 and 10

... a. What recommendations will you make regarding the type and characteristics of the required database system? The Magazine Publishing Company requires a distributed system with distributed database capabilities. The distributed system will be distributed among the company locations in South Carolina ...
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END

... commands can be used directly inside PL/SQL blocks. Data Definition Language (DDL) commands cannot be used directly inside PL/SQL blocks, but they can be used indirectly through dynamic SQL statements. Oracle Database PL/SQL 10g Programming (Chapter 4) ...
SQL Slides
SQL Slides

... ©Silberschatz, Korth and Sudarshan ...
Chapter 4: SQL - Avi Silberschatz
Chapter 4: SQL - Avi Silberschatz

... ©Silberschatz, Korth and Sudarshan ...
Chapter 4: SQL
Chapter 4: SQL

... ©Silberschatz, Korth and Sudarshan ...
ppt - Avi Silberschatz
ppt - Avi Silberschatz

... ©Silberschatz, Korth and Sudarshan ...
branch-name
branch-name

... where branch-name = ‘Perryridge’  Delete all accounts at every branch located in Needham city. delete from account where branch-name in (select branch-name from branch where branch-city = ‘Needham’) delete from depositor where account-number in (select account-number from branch, account where bran ...
Database Lifecycle Management
Database Lifecycle Management

... If you work for an organization that produces database-driven software systems, and the database needs frequent or periodic changes to features, functionality, or data, then this book is for you. It describes how to apply the business and technical approaches of Database Lifecycle Management (DLM) t ...
The Antelope Relational Database Management System
The Antelope Relational Database Management System

... Refer back to the help window for the wfdisc table; this table describes external files which contain recorded data from an instrument. The sta and chan fields specify a particular location and instrument. These fields, plus the time and endtime fields, all taken together, comprise the primary key f ...
Oracle Database 11g: 5 Essential Steps to Upgrade
Oracle Database 11g: 5 Essential Steps to Upgrade

... Anderson developed a three-page template for her upgrade, with a list of all the people involved and their contact information, each step of the upgrade with commands and start and stop times, and a list of the backup steps in case the 11g upgrade runs into problems along the way. ...
Chapter 5: Other Relational Languages
Chapter 5: Other Relational Languages

... Brooklyn at which they have accounts, and compare with total number of branches in Brooklyn  QBE does not provide subquery functionality, so both above tasks have to be combined in a single query.  Can be done for this query, but there are queries that require ...
ppt
ppt

... Brooklyn at which they have accounts, and compare with total number of branches in Brooklyn  QBE does not provide subquery functionality, so both above tasks have to be combined in a single query.  Can be done for this query, but there are queries that require ...
Introduction to Database Management Systems
Introduction to Database Management Systems

...  Three-level architecture: E.g. web-based applications, and applications built using “middleware”  Your projects will use the three-tier architecture UBI 502 Database Management Systems ...
Chapter 5: Other Relational Languages
Chapter 5: Other Relational Languages

... Brooklyn at which they have accounts, and compare with total number of branches in Brooklyn  QBE does not provide subquery functionality, so both above tasks have to be combined in a single query.  Can be done for this query, but there are queries that require ...
ppt
ppt

... Brooklyn at which they have accounts, and compare with total number of branches in Brooklyn  QBE does not provide subquery functionality, so both above tasks have to be combined in a single query.  Can be done for this query, but there are queries that require ...
pdf-2
pdf-2

... and balances for accounts at the Perryridge branch with a balance of over $700. v1(A, B) :– account(A, “Perryridge”, B), B > 700. ■ Retrieve the balance of account number “A-217” in the view ...
Second Normal Form - Department of Computer Science
Second Normal Form - Department of Computer Science

...  PDT is a superkey, and FD is a superkey.  Is PDT a candidate key?  PD is not a superkey, nor is DT, nor is PT.  So, PDT is a candidate key.  FD is also a candidate key, since neither F or D ...
(A) R
(A) R

...  E.g. Set of accounts stored with each customer, and set of owners stored with each account  We assume all relations are in first normal form ...
< 1 ... 14 15 16 17 18 19 20 21 22 ... 150 >

Serializability

In concurrency control of databases, transaction processing (transaction management), and various transactional applications (e.g., transactional memory and software transactional memory), both centralized and distributed, a transaction schedule is serializable if its outcome (e.g., the resulting database state) is equal to the outcome of its transactions executed serially, i.e., sequentially without overlapping in time. Transactions are normally executed concurrently (they overlap), since this is the most efficient way. Serializability is the major correctness criterion for concurrent transactions' executions. It is considered the highest level of isolation between transactions, and plays an essential role in concurrency control. As such it is supported in all general purpose database systems. Strong strict two-phase locking (SS2PL) is a popular serializability mechanism utilized in most of the database systems (in various variants) since their early days in the 1970s.Serializability theory provides the formal framework to reason about and analyze serializability and its techniques. Though it is mathematical in nature, its fundamentals are informally (without mathematics notation) introduced below.
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