Chapter 14: Query Optimization
... expressions equivalent to the given expression Conceptually, generate all equivalent expressions by repeatedly executing the following step until no more expressions can be found Very expensive in space and time Space requirements reduced by sharing common subexpressions: ...
... expressions equivalent to the given expression Conceptually, generate all equivalent expressions by repeatedly executing the following step until no more expressions can be found Very expensive in space and time Space requirements reduced by sharing common subexpressions: ...
DBA Cheat Sheet
... Registered Servers: https://www.mssqltips.com/sqlservertip/1996/registering-sqlserver-instances-for-easier-management/ Import and Export Registered Servers: https://www.mssqltips.com/sqlservertip/2015/import-and-export-registered-sqlservers-to-other-machines/ Display Line Numbers in Query Wind ...
... Registered Servers: https://www.mssqltips.com/sqlservertip/1996/registering-sqlserver-instances-for-easier-management/ Import and Export Registered Servers: https://www.mssqltips.com/sqlservertip/2015/import-and-export-registered-sqlservers-to-other-machines/ Display Line Numbers in Query Wind ...
Entity Sets
... Set of programs to access the data DBMS contains information about a particular enterprise DBMS provides an environment that is both convenient and ...
... Set of programs to access the data DBMS contains information about a particular enterprise DBMS provides an environment that is both convenient and ...
PHP connectivity
... $results = mysql_query($query) or die("could not retrieve rows"); while ($row = mysql_fetch_row($results)){ echo 'Title: '.$row[1].'
'; ...
... $results = mysql_query($query) or die("could not retrieve rows"); while ($row = mysql_fetch_row($results)){ echo 'Title: '.$row[1].'
'; ...
Strategies and Techniques for Using Oracle7 Replication
... system and automatically forward them after recovery is complete. All of the prior examples employ a static, exclusive ownership model (often referred to as primary site ownership). An example of exclusive ownership where the data owner may change over time is best illustrated with a work flow examp ...
... system and automatically forward them after recovery is complete. All of the prior examples employ a static, exclusive ownership model (often referred to as primary site ownership). An example of exclusive ownership where the data owner may change over time is best illustrated with a work flow examp ...
Mirroring - Dynamics User Group
... http://www.stryk.info/toolbox.html http://dynamicsuser.net/blogs/stryk/ ...
... http://www.stryk.info/toolbox.html http://dynamicsuser.net/blogs/stryk/ ...
2.0 The Background of Database Systems
... This segment proposes different architectures for database systems. The centralized, distributed, parallel, and web-based designs are presented each with its strengths and weaknesses and the concrete reasons for their selection. The segment recommends using web enabled centralized databases unless t ...
... This segment proposes different architectures for database systems. The centralized, distributed, parallel, and web-based designs are presented each with its strengths and weaknesses and the concrete reasons for their selection. The segment recommends using web enabled centralized databases unless t ...
Database Tuning Principles, Experiments and Troubleshooting
... • Repeatable Read (no unrepeatable reads for read/write ) – Two phase locking ...
... • Repeatable Read (no unrepeatable reads for read/write ) – Two phase locking ...
Chapter 1
... • Understand the Northwoods University student registration database and the Clearwater Traders sales order database ...
... • Understand the Northwoods University student registration database and the Clearwater Traders sales order database ...
Introduction to Database Systems
... Strict two-phase locking uses shared and exclusive locks to protect data. A transaction must hold all the required locks before executing, and does not release any lock until the transaction has completely finished. What is the WAL property, and why is it important? The WAL property affects the logg ...
... Strict two-phase locking uses shared and exclusive locks to protect data. A transaction must hold all the required locks before executing, and does not release any lock until the transaction has completely finished. What is the WAL property, and why is it important? The WAL property affects the logg ...
The Design and Implementation of Ingres
... and the utility commands accepted by the current system. The second user interface, CUPID, is a graphics oriented, casual user language which is also operational [20, 211 but not discussed in this paper. In Section 1.3 we describe the EQUEL (Embedded QUEL) precompiler, which allows the substitution ...
... and the utility commands accepted by the current system. The second user interface, CUPID, is a graphics oriented, casual user language which is also operational [20, 211 but not discussed in this paper. In Section 1.3 we describe the EQUEL (Embedded QUEL) precompiler, which allows the substitution ...
1 Introduction to DBMS
... Drawbacks of using file systems(Cont.) Atomicity of updates Failures may leave database in an inconsistent state with partial updates carried out Example: Transfer of funds from one account to another should either complete or not happen at all Concurrent access by multiple users Concurrent ...
... Drawbacks of using file systems(Cont.) Atomicity of updates Failures may leave database in an inconsistent state with partial updates carried out Example: Transfer of funds from one account to another should either complete or not happen at all Concurrent access by multiple users Concurrent ...
OBIEE 11g Analytics Using EMC Greenplum Database Users
... This white paper is intended for EMC field facing employees such as sales, technical consultants, support, as well as customers who will be using OBIEE for deploying business intelligence and analytic applications. This is neither an installation guide nor an introductory material on OBIEE. It docum ...
... This white paper is intended for EMC field facing employees such as sales, technical consultants, support, as well as customers who will be using OBIEE for deploying business intelligence and analytic applications. This is neither an installation guide nor an introductory material on OBIEE. It docum ...
CH04
... Dynamic SQL Dynamic SQL consists of a set of “dynamic statements”---which themselves are compiled ahead of time---whose purpose is precisely to support the compilation and execution of regular SQL statements that are constructed at run time. Prepare and Execute statements e.g. DCL Sqlsource Ch ...
... Dynamic SQL Dynamic SQL consists of a set of “dynamic statements”---which themselves are compiled ahead of time---whose purpose is precisely to support the compilation and execution of regular SQL statements that are constructed at run time. Prepare and Execute statements e.g. DCL Sqlsource Ch ...
Chapter 7: Relational Database Design
... Multiple Inheritance SQL:1999 does not support multiple inheritance If our type system supports multiple inheritance, we can define a ...
... Multiple Inheritance SQL:1999 does not support multiple inheritance If our type system supports multiple inheritance, we can define a ...
Document
... subtype discriminator) go into supertype relation – Subtype attributes go into each subtype; primary key of supertype relation also becomes primary key of subtype relation – 1:1 relationship established between supertype and each subtype, with supertype as primary ...
... subtype discriminator) go into supertype relation – Subtype attributes go into each subtype; primary key of supertype relation also becomes primary key of subtype relation – 1:1 relationship established between supertype and each subtype, with supertype as primary ...
Document
... entity sets becomes a superkey of the relation. Binary many-to-one relationship sets the primary key of the ‘many’ entity set becomes the relation’s primary key. One-to-one relationship sets primary key of either entity set. Many-to-many relationship sets union of the primary keys ...
... entity sets becomes a superkey of the relation. Binary many-to-one relationship sets the primary key of the ‘many’ entity set becomes the relation’s primary key. One-to-one relationship sets primary key of either entity set. Many-to-many relationship sets union of the primary keys ...
Hibernate
... The programmer must convert the object values into groups of simpler values for storage in the database (and convert them back on retrieval) or Use only simple scalar values within the program ...
... The programmer must convert the object values into groups of simpler values for storage in the database (and convert them back on retrieval) or Use only simple scalar values within the program ...
jhtp5_23 - IC
... The JDBC-to-ODBC bridge driver connects Java programs to Microsoft ODBC (Open Database Connectivity) data sources. The Java 2 Software Development Kit from Sun Microsystems, Inc. includes the JDBC-to-ODBC bridge driver (sun.jdbc.odbc.JdbcOdbcDriver). This driver typically requires the ODBC driver to ...
... The JDBC-to-ODBC bridge driver connects Java programs to Microsoft ODBC (Open Database Connectivity) data sources. The Java 2 Software Development Kit from Sun Microsystems, Inc. includes the JDBC-to-ODBC bridge driver (sun.jdbc.odbc.JdbcOdbcDriver). This driver typically requires the ODBC driver to ...
jhtp5_23
... The JDBC-to-ODBC bridge driver connects Java programs to Microsoft ODBC (Open Database Connectivity) data sources. The Java 2 Software Development Kit from Sun Microsystems, Inc. includes the JDBC-to-ODBC bridge driver (sun.jdbc.odbc.JdbcOdbcDriver). This driver typically requires the ODBC driver to ...
... The JDBC-to-ODBC bridge driver connects Java programs to Microsoft ODBC (Open Database Connectivity) data sources. The Java 2 Software Development Kit from Sun Microsystems, Inc. includes the JDBC-to-ODBC bridge driver (sun.jdbc.odbc.JdbcOdbcDriver). This driver typically requires the ODBC driver to ...
Search Engine and Metasearch Engine
... concepts. When a user submits a query, the user also specifies the related concepts. In [4], training queries are used to assign databases to 13 categories/concepts. These methods may not scale to a large number of databases due to their manual or training nature. In [23], several methods are propos ...
... concepts. When a user submits a query, the user also specifies the related concepts. In [4], training queries are used to assign databases to 13 categories/concepts. These methods may not scale to a large number of databases due to their manual or training nature. In [23], several methods are propos ...
Creampie gangban gif
... 3. Initiate procedure call from the same database session, for example: EXEC my_procedure; ...
... 3. Initiate procedure call from the same database session, for example: EXEC my_procedure; ...
Review 1
... • If a relation schema has more than one key, each of them is called a candidate key. • one candidate key is chosen as the primary key (PK) • foreign key (FK) is defined as follows: i) Consider two relation schemas R1 and R2; ii) The attributes in FK in R1 have the same domain(s) as the primary key ...
... • If a relation schema has more than one key, each of them is called a candidate key. • one candidate key is chosen as the primary key (PK) • foreign key (FK) is defined as follows: i) Consider two relation schemas R1 and R2; ii) The attributes in FK in R1 have the same domain(s) as the primary key ...
Access.12
... • In the Analyze group on the Database Tools tab on the Ribbon, click the Analyze Performance button • Select the object(s) you want to analyze, and then click the OK button • Select the analysis result(s) you want the Performance Analyzer to complete for you, and then click the Optimize button • No ...
... • In the Analyze group on the Database Tools tab on the Ribbon, click the Analyze Performance button • Select the object(s) you want to analyze, and then click the OK button • Select the analysis result(s) you want the Performance Analyzer to complete for you, and then click the Optimize button • No ...
SQL Server Replication: Providing High Availability using Database
... transactions. When the database is not synchronized, the mirror server is typically available as a warm standby server (with possible data loss). A database mirroring session runs with either synchronous or asynchronous operation. Under asynchronous operation (also called high-performance mode), tra ...
... transactions. When the database is not synchronized, the mirror server is typically available as a warm standby server (with possible data loss). A database mirroring session runs with either synchronous or asynchronous operation. Under asynchronous operation (also called high-performance mode), tra ...