Document
... PRIMARY KEY and UNIQUE: Used to make sure your rows contain only unique combinations of values over a given set of key columns. FOREIGN KEY: Used to make sure that any migrated keys have only valid values that match the key columns they reference. DEFAULT: Used to set an acceptable default value for ...
... PRIMARY KEY and UNIQUE: Used to make sure your rows contain only unique combinations of values over a given set of key columns. FOREIGN KEY: Used to make sure that any migrated keys have only valid values that match the key columns they reference. DEFAULT: Used to set an acceptable default value for ...
... IIDR uses the concept of Journal Control Fields which are specific types of database log information that are made available for each row that is replicated e,g, user name who made the change, the Commit timestamp of the change, the actual action that occurred on the source (Insert, Update or Delete ...
Large Spatial Data Computation on Shared
... of latitude-longitude pairs to accurately represent the geometry of spatial features such as towns, rivers or villages. This leads to spatial data operations being computationally and memory intensive. Also, there exist certain real world scenarios which generates an extremely large amount of spatia ...
... of latitude-longitude pairs to accurately represent the geometry of spatial features such as towns, rivers or villages. This leads to spatial data operations being computationally and memory intensive. Also, there exist certain real world scenarios which generates an extremely large amount of spatia ...
Valid Time Database Implementation Using Oracle11g Workspace
... However, the to_date is the first date that the fact is false. For example, from_date 2005-05-01 and to_date 2007-01-01 means that the fact is valid from May 1, 2005 to December 31, 2005. This close-open format is well accepted because it is convenience to check period continuity. The from_date of a ...
... However, the to_date is the first date that the fact is false. For example, from_date 2005-05-01 and to_date 2007-01-01 means that the fact is valid from May 1, 2005 to December 31, 2005. This close-open format is well accepted because it is convenience to check period continuity. The from_date of a ...
Chapter 4: SQL
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
4 Creating a Simple Query
... Above all other keywords, SELECT truly lies at the heart of SQL. It is the cornerstone of the most powerful and complex statement within the language and the means by which you retrieve information from the tables in your database. You use SELECT in conjunction with other keywords and clauses to fin ...
... Above all other keywords, SELECT truly lies at the heart of SQL. It is the cornerstone of the most powerful and complex statement within the language and the means by which you retrieve information from the tables in your database. You use SELECT in conjunction with other keywords and clauses to fin ...
Slides - CIS @ Temple University
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) ...
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) ...
An Introduction to Spatial Database Systems
... held biannually since 1989 (Buchmann et al., 1989; Gtinther and Schek, 1991; Abel and Ooi, 1993). This term is associated with a view of a database as containing sets of objects in space rather than images or pictures of a space. Indeed, the requirements and techniques for dealing with objects in sp ...
... held biannually since 1989 (Buchmann et al., 1989; Gtinther and Schek, 1991; Abel and Ooi, 1993). This term is associated with a view of a database as containing sets of objects in space rather than images or pictures of a space. Indeed, the requirements and techniques for dealing with objects in sp ...
Database Configuration - L-Soft
... inherent to each Oracle installation. It is determined mainly by the block size used by the database but may also be influenced by other factors, like the operating system. For LISTSERV Maestro to be able to create its database table in an optimal manner, it needs to know the maximum key length valu ...
... inherent to each Oracle installation. It is determined mainly by the block size used by the database but may also be influenced by other factors, like the operating system. For LISTSERV Maestro to be able to create its database table in an optimal manner, it needs to know the maximum key length valu ...
Joins for Hybrid Warehouses: Exploiting Massive Parallelism in Hadoop and Enterprise Data Warehouses.
... that work well between a parallel database and an HDFS cluster. Note that these joins work across two heterogeneous systems and hence have asymmetric properties that needs to be taken into account. HDFS is optimized by large bulk I/O, and as a result record level indexing does not provide significan ...
... that work well between a parallel database and an HDFS cluster. Note that these joins work across two heterogeneous systems and hence have asymmetric properties that needs to be taken into account. HDFS is optimized by large bulk I/O, and as a result record level indexing does not provide significan ...
Jerry Held - SQLQuery.com
... Transfer disk ownership from the primary node to a secondary node Restart application and database binaries Perform application and database recovery Reestablish client connections to the failover ...
... Transfer disk ownership from the primary node to a secondary node Restart application and database binaries Perform application and database recovery Reestablish client connections to the failover ...
White Paper
... Out of the box, AWR data is automatically collected every hour on the hour. The Oracle kernel allocates a small but distinct portion of the System Global Area (SGA) to buffers that are dedicated to holding session history and other AWR-related information. These in-memory buffers are updated by the ...
... Out of the box, AWR data is automatically collected every hour on the hour. The Oracle kernel allocates a small but distinct portion of the System Global Area (SGA) to buffers that are dedicated to holding session history and other AWR-related information. These in-memory buffers are updated by the ...
Welcome to the ARPEGGIO Information Publisher
... ARPEGGIO For The Desktop ............................................................................ 1-2 ARPEGGIO For The Developer......................................................................... 1-2 ARPEGGIO components: ..................................................................... ...
... ARPEGGIO For The Desktop ............................................................................ 1-2 ARPEGGIO For The Developer......................................................................... 1-2 ARPEGGIO components: ..................................................................... ...
Consolidation Best Practices: Oracle Database 12c plugs you into
... capital expenditure through raising hardware utilization; reduce operational costs: power, space, administration. All of these goals are achievable via a good consolidation strategy, which is all well and good, but much more can be achieved if consolidation is viewed as building a platform on which ...
... capital expenditure through raising hardware utilization; reduce operational costs: power, space, administration. All of these goals are achievable via a good consolidation strategy, which is all well and good, but much more can be achieved if consolidation is viewed as building a platform on which ...
1 1. Introduction 1.1. Overview of POSTGRES and XPRS
... space, both systems limit the search time. University INGRES uses a greedy search heuristic known as ‘‘decomposition’’ and commercial INGRES uses a (varying) limit on the time spent optimizing the query. As another example, consider the System R optimizer described in [SELI79]. Unlike the INGRES opt ...
... space, both systems limit the search time. University INGRES uses a greedy search heuristic known as ‘‘decomposition’’ and commercial INGRES uses a (varying) limit on the time spent optimizing the query. As another example, consider the System R optimizer described in [SELI79]. Unlike the INGRES opt ...
free sample here
... Look at the software request form above. What questions would you ask about this form? Answer: I would ask when the form is used and by whom. I would also ask clarification for the terms R#, C# and EID. I would also ask what the various status values could be and who determines them. Diff: 3 Page Re ...
... Look at the software request form above. What questions would you ask about this form? Answer: I would ask when the form is used and by whom. I would also ask clarification for the terms R#, C# and EID. I would also ask what the various status values could be and who determines them. Diff: 3 Page Re ...
PLSQL Lecture 5
... – Executes implicitly whenever a particular event takes place – Can be either of the following: • Application trigger: Fires whenever an event occurs with a particular application • Database trigger: Fires whenever a data event (such as DML) or system event (such as logon or shutdown) occurs on a sc ...
... – Executes implicitly whenever a particular event takes place – Can be either of the following: • Application trigger: Fires whenever an event occurs with a particular application • Database trigger: Fires whenever a data event (such as DML) or system event (such as logon or shutdown) occurs on a sc ...
Chapter 5: Other Relational Languages
... Null Values It is possible for tuples to have a null value (denoted by null) for some of their ...
... Null Values It is possible for tuples to have a null value (denoted by null) for some of their ...
Requirements for XML Document Database Systems
... On the other hand, XML will also be used in ways SGML and HTML were not, most notably as the data exchange format between different applications. As was the situation with dynamically created HTML documents, in the new areas there is not necessarily a need for persistent storage of XML documents. Of ...
... On the other hand, XML will also be used in ways SGML and HTML were not, most notably as the data exchange format between different applications. As was the situation with dynamically created HTML documents, in the new areas there is not necessarily a need for persistent storage of XML documents. Of ...
Microsoft SQL Server Database Protection Using
... Database protection and disaster recovery are among the top concerns for SQL Server database administrators. Requirements for reducing database backup windows and restore times continue as demands increase for continuous SQL Server database uptime. PS Series arrays provide administrators the ability ...
... Database protection and disaster recovery are among the top concerns for SQL Server database administrators. Requirements for reducing database backup windows and restore times continue as demands increase for continuous SQL Server database uptime. PS Series arrays provide administrators the ability ...
The Oracle Background Processes
... a combination of Oracle and Sybase servers, running on the same host. When you create an Oracle instance, a so-called magic key is created by hashing together the UNIX environment variables $ORACLE_HOME and $ORACLE_SID. On a given host, this magic key is unique (since you cannot have two instances w ...
... a combination of Oracle and Sybase servers, running on the same host. When you create an Oracle instance, a so-called magic key is created by hashing together the UNIX environment variables $ORACLE_HOME and $ORACLE_SID. On a given host, this magic key is unique (since you cannot have two instances w ...