Notes
... • deduct from one account and credit to another If one steps succeeds and the other fails, database is in an inconsistent state Therefore, either both steps should succeed or neither should ...
... • deduct from one account and credit to another If one steps succeeds and the other fails, database is in an inconsistent state Therefore, either both steps should succeed or neither should ...
Slide 1
... SQL will be faster if the database files are contiguous in the file system Using the built in defrag tool will have performance ramifications Consider using something like Diskeeper and its intelligent defrag. Consider stopping SQL if possible ...
... SQL will be faster if the database files are contiguous in the file system Using the built in defrag tool will have performance ramifications Consider using something like Diskeeper and its intelligent defrag. Consider stopping SQL if possible ...
Oracle
... tables, views, indexes, and so on) that store or access the data of a database. Structures and the data contained within them can be manipulated by operations. • Operations: Operations are clearly defined actions that allow users to manipulate the data and structures of a database. The operations on ...
... tables, views, indexes, and so on) that store or access the data of a database. Structures and the data contained within them can be manipulated by operations. • Operations: Operations are clearly defined actions that allow users to manipulate the data and structures of a database. The operations on ...
InterBase® and MySQL
... If your application requires a lot of INSERT, UPDATE, and DELETE statements, users may have trouble getting SELECT statements to execute. Because MyISAM processes statements sequentially and gives SQL statements that change the data priority over SELECT statements, users running SELECTs may see poor ...
... If your application requires a lot of INSERT, UPDATE, and DELETE statements, users may have trouble getting SELECT statements to execute. Because MyISAM processes statements sequentially and gives SQL statements that change the data priority over SELECT statements, users running SELECTs may see poor ...
Ambit - Cheminformatics software for data
... • stores chemical structures, their identifiers such as CAS, INChI numbers; attributes such as molecular descriptors, experimental data together with test descriptions, and literature references. The database can also store QSAR models. In addition the software can generate a suite of 2D and 3D mole ...
... • stores chemical structures, their identifiers such as CAS, INChI numbers; attributes such as molecular descriptors, experimental data together with test descriptions, and literature references. The database can also store QSAR models. In addition the software can generate a suite of 2D and 3D mole ...
Database Management System
... (A) With finer degree of granularity of locking a high degree of concurrency is possible. (B) Locking prevents non – serializable schedules. (C) Locking cannot take place at field level. (D) An exclusive lock on data item X is granted even if a shared lock is already held on X. ...
... (A) With finer degree of granularity of locking a high degree of concurrency is possible. (B) Locking prevents non – serializable schedules. (C) Locking cannot take place at field level. (D) An exclusive lock on data item X is granted even if a shared lock is already held on X. ...
Developing Applications for a Distributed
... Oracle9i Application Developer's Guide - Fundamentals for more information about application development in an Oracle environment ...
... Oracle9i Application Developer's Guide - Fundamentals for more information about application development in an Oracle environment ...
pobierz plik referatu
... which is being created at Military University of Technology. MUTDOD is meant to be a next step in a database engine evolution - it pretends to be a platform for object systems containing applications coded in object languages (e.g. C#, Java, ect.), which are working with data stored in object databa ...
... which is being created at Military University of Technology. MUTDOD is meant to be a next step in a database engine evolution - it pretends to be a platform for object systems containing applications coded in object languages (e.g. C#, Java, ect.), which are working with data stored in object databa ...
Slide 1
... original table, but a different number of columns • Project does not always result in a table with the same number of rows as the original table • Both Select and Project operations are used to “trim” base tables to keep some of the rows and some of the columns ...
... original table, but a different number of columns • Project does not always result in a table with the same number of rows as the original table • Both Select and Project operations are used to “trim” base tables to keep some of the rows and some of the columns ...
QuotesDBAdapter.java
... import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; ...
... import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; ...
Chapter 1: Introduction
... begin atomic insert into orders (select item, level from reorder where reorder.item = orow.item) end ...
... begin atomic insert into orders (select item, level from reorder where reorder.item = orow.item) end ...
Introduction to Sqlite and its usage with python 1. Sqlite : SQLite is a
... To connect to database through sqlite : $ sqlite3 ex1.db There are various shells and command lines available for manipulating Sqlite databases. 2. SQLite Database browser It is a light GUI editor for SQLite databases. It can be used as a basic database management system. ...
... To connect to database through sqlite : $ sqlite3 ex1.db There are various shells and command lines available for manipulating Sqlite databases. 2. SQLite Database browser It is a light GUI editor for SQLite databases. It can be used as a basic database management system. ...
Slides - UCLA Computer Science
... SET to modify the values of NEW 2. SIGNAL will nullify the action but not the transaction 3. VALUES used to call a function. ...
... SET to modify the values of NEW 2. SIGNAL will nullify the action but not the transaction 3. VALUES used to call a function. ...
Full Article
... In Apriori algorithm, from Ck to Lk have two steps: (1) Pruning itemsets according to Lk-1. (2) Pruning itemsets according to minsupport. First, the set of frequent 1-itemsets is found. This set is denoted L1. L1 is used to find L2, the set of frequent 2itemsets, which is used to find L3, and so on, ...
... In Apriori algorithm, from Ck to Lk have two steps: (1) Pruning itemsets according to Lk-1. (2) Pruning itemsets according to minsupport. First, the set of frequent 1-itemsets is found. This set is denoted L1. L1 is used to find L2, the set of frequent 2itemsets, which is used to find L3, and so on, ...
PRISMA/DB: A Parallel, Main Memory Relational
... sender to wait for the reply. An asynchronous message does not have a reply. Synchronous communication between objects synchronizes their execution and may, therefore, impede the effective parallelism. Asynchronous communication does not have this drawback. Communication between objects that are all ...
... sender to wait for the reply. An asynchronous message does not have a reply. Synchronous communication between objects synchronizes their execution and may, therefore, impede the effective parallelism. Asynchronous communication does not have this drawback. Communication between objects that are all ...
Introduction to Relational Database
... A Database Management System (DBMS) is a software designed to assist in maintaining & utilizing large collection of data eg.: ...
... A Database Management System (DBMS) is a software designed to assist in maintaining & utilizing large collection of data eg.: ...
Database Management - Courses - University of California, Berkeley
... • Well-designed database systems will permit the applications to scale to accommodate very large databases – A script that works fine scanning a small data file may become unusable when the file becomes large. – Issues of transaction workload on the site • Starting a separate copy of a CGI program f ...
... • Well-designed database systems will permit the applications to scale to accommodate very large databases – A script that works fine scanning a small data file may become unusable when the file becomes large. – Issues of transaction workload on the site • Starting a separate copy of a CGI program f ...
An Introduction to Distributed Object Management
... giving rise to inter-query parallelism . Further optimization (access path selection) of each sub-query is done at each site where it is executed. Transactional accesses are managed by global transaction managers with the help of schedulers for synchronization and local recovery managers for reliabi ...
... giving rise to inter-query parallelism . Further optimization (access path selection) of each sub-query is done at each site where it is executed. Transactional accesses are managed by global transaction managers with the help of schedulers for synchronization and local recovery managers for reliabi ...
Name
... from books where title = `Database System Concepts’ To get a relation containing pairs of the form “title, author” for each book and each author of the book select B.title, A.author from books as B, unnest (B.author_array) as A (author ) To retain ordering information we add a with ordinality cl ...
... from books where title = `Database System Concepts’ To get a relation containing pairs of the form “title, author” for each book and each author of the book select B.title, A.author from books as B, unnest (B.author_array) as A (author ) To retain ordering information we add a with ordinality cl ...
Decision support, OLAP
... size estimation is difficult. • Two interesting cases: – If the join with some dimension table results in much fewer tuples than in the fact table, we may perform this join first using an index (if available). – Otherwise we may use the pipelined join that scans the whole fact table. ...
... size estimation is difficult. • Two interesting cases: – If the join with some dimension table results in much fewer tuples than in the fact table, we may perform this join first using an index (if available). – Otherwise we may use the pipelined join that scans the whole fact table. ...
Techwave_2005_am18a_ASAInternals
... Both ALL and DISTINCT variants are supported; DISTINCT performed by default Form query expressions in the same fashion as UNION NULL treated as a special value in each domain, hence NULLs are equivalent to each other ...
... Both ALL and DISTINCT variants are supported; DISTINCT performed by default Form query expressions in the same fashion as UNION NULL treated as a special value in each domain, hence NULLs are equivalent to each other ...
JDBC Stands for Java Database Connectivity, is an API specification
... This driver has many same restrictions as bridge because it uses native library but they are faster than bridge. It can not be used in untrusted applets. This native library must be installed on each machine which uses the driver. Java applet, apps ...
... This driver has many same restrictions as bridge because it uses native library but they are faster than bridge. It can not be used in untrusted applets. This native library must be installed on each machine which uses the driver. Java applet, apps ...