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Oracle Database Administrator`s Guide
Oracle Database Administrator`s Guide

... dangerous applications. It shall be the licensee's responsibility to take all appropriate fail-safe, backup, redundancy and other measures to ensure the safe use of such applications if the Programs are used for such purposes, and we disclaim liability for any damages caused by such use of the Progr ...
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... The msdb database is used by SQL Server Agent for scheduling alerts and jobs and by other features such as SQL Server Management Studio, Service Broker and Database Mail. For example, SQL Server automatically maintains a complete online backup-and-restore history within tables in msdb. This informat ...
SAP HANA Multitenant Database Containers
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... Scale-Out Recommendations When planning an SAP HANA MDC deployment, various options exist with regard to scale-up versus scale-out. In general, scaling up offers some performance advantages over scaling out, as memory access is local and minor overhead associated with inter-node network communicatio ...
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TMF Introduction - Hewlett Packard Enterprise
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... among many disks on a system (node), or across many nodes in a network. The database can be a SQL relational database, an Enscribe database, or a combination of both. The role of TMF in transaction processing is illustrated in Figure 1-1. TMF also supports heterogeneous transaction processing throug ...
Greenplum Database 4.3.1.0 Release Notes
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... segments when writing data from different segments to the file. You can specify a time to wait before Greenplum Database closes the file to ensure all the data is written to the file. ...
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... dynamic definition of database access to result in maximally restrictive queries which reduce the amount of data to be imported from the database system. The use of a standard datastructure allows the built-in memory management to be used, which also contributes to the overall efficiency of the appr ...
Greenplum Database 4.3.0.0 Release Notes
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... warehouse environment, where the data is static after it is loaded. Denormalized fact tables are typically the largest tables in the system. Fact tables are usually loaded in batches and accessed by read-only queries. Moving large fact tables to an append-only storage model eliminates the storage ov ...
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Oracle Database 11g New Features

... Upgrades supported Can be a bit tedious and requires a number of manual steps. Recommend you use a checklist! More overall control over the upgrade process. Most steps can be re-executed if they fail once you have corrected the cause of the failure. ...
overview talk - UCSB Computer Science
overview talk - UCSB Computer Science

... ◦ Abort transactions (at both nodes) that make structural changes to indices ...
CIM Database Model White Paper CIM Version 2.10 Abstract
CIM Database Model White Paper CIM Version 2.10 Abstract

... crosses vendor and platform boundaries enables more advanced management capabilities, such as cross-vendor diagnostics. Management solution providers also benefit from the development of a common database model. The common model content provides a blueprint of database entities and properties that s ...
Upgrade from Oracle9i to Oracle Database 11g
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... An Oracle database upgrade is often considered as a risky task by database IT people. Upgrade tests have to be run, all applications have to be verified and validated in the new database environment and performance at the same level or better has to be ensured and achieved. Upgrading directly from O ...
Database Planning Workbook
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... Your use of this GUIDE means that you agree to indemnify and hold harmless CompuMentor and its affiliates from and against any and all claims, losses, liability, damages, costs or expenses (including but not limited to reasonable attorneys’ fees) suffered or incurred by CompuMentor in connection wit ...
ORACLE 11g AND 12c DATABASE CONSOLIDATION
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... Oracle databases consume too much time for database administrators, storage teams, and application owners striving to optimize end-to-end performance through complex database layout and configuration. This issue is more severe in mixed workload environments with OLTP, data warehouses, reports, analy ...
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... a logic programming language and a relational database management system, is the combination of the efficiency and safety of database systems in dealing with large amounts of data with the higher expressive power of logic systems. A logic programming language is a concise and intuitive way of specif ...
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... Deleting records: You can configure the BarTender System Database to delete records older than a specified date. You can optionally archive old records, or simply delete them from the system. Archiving records: If you enable Archive deleted records, you can select a file where your archived records ...
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... NOTE: During the sandbox installation for new version DB2 UDB, it failed because space ran out on /home and /home/db2inst2 Also need to re-install with new name for DB2 Admin instance- call it dasuser instead of db2as!!!!! 2. Free up additional space under /home/db2inst2 the new DB2 UDB 8.1 instanc ...
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... Default: PRIVUSER Description: The following is true for the privileged user: Owns views to most of the schema user tables that filter out logically deleted data.  Has SELECT, INSERT, UPDATE, and DELETE privileges on all of the tables owned by the schema user.  Has EXECUTE privileges on all schema ...
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distributed database

... A distributed database is a database in which portions of the database are stored on multiple computers within a network. Users have access to the portion of the database at their location so that they can access the data relevant to their tasks without interfering with the work of others. A central ...
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Android-Chapter17-SQL-Databases

... Creating-Populating a Table We will use the execSQL(…) method to manipulate SQL action queries. The following example creates a new table called tblAmigo. The table has three fields: a numeric unique identifier called recID, and two string fields representing our friend’s name and phone. If a table ...
Multimedia Databases - IfIS - Technische Universität Braunschweig
Multimedia Databases - IfIS - Technische Universität Braunschweig

... • Value between [0, 1] (1 representing the best value) • High number of false alarms mean worse results Multimedia Databases– Wolf-Tilo Balke – Institut für Informationssysteme – TU Braunschweig ...
SQL Databases
SQL Databases

... Creating-Populating a Table We will use the execSQL(…) method to manipulate SQL action queries. The following example creates a new table called tblAmigo. The table has three fields: a numeric unique identifier called recID, and two string fields representing our friend’s name and phone. If a table ...
6231B_06
6231B_06

... Note: You cannot create a differential database backup if no full backup ...
1 2 3 4 5 ... 39 >

Global serializability

In concurrency control of databases, transaction processing (transaction management), and other transactional distributed applications, Global serializability (or Modular serializability) is a property of a global schedule of transactions. A global schedule is the unified schedule of all the individual database (and other transactional object) schedules in a multidatabase environment (e.g., federated database). Complying with global serializability means that the global schedule is serializable, has the serializability property, while each component database (module) has a serializable schedule as well. In other words, a collection of serializable components provides overall system serializability, which is usually incorrect. A need in correctness across databases in multidatabase systems makes global serializability a major goal for global concurrency control (or modular concurrency control). With the proliferation of the Internet, Cloud computing, Grid computing, and small, portable, powerful computing devices (e.g., smartphones), as well as increase in systems management sophistication, the need for atomic distributed transactions and thus effective global serializability techniques, to ensure correctness in and among distributed transactional applications, seems to increase.In a federated database system or any other more loosely defined multidatabase system, which are typically distributed in a communication network, transactions span multiple (and possibly distributed) databases. Enforcing global serializability in such system, where different databases may use different types of concurrency control, is problematic. Even if every local schedule of a single database is serializable, the global schedule of a whole system is not necessarily serializable. The massive communication exchanges of conflict information needed between databases to reach conflict serializability globally would lead to unacceptable performance, primarily due to computer and communication latency. Achieving global serializability effectively over different types of concurrency control has been open for several years. Commitment ordering (or Commit ordering; CO), a serializability technique publicly introduced in 1991 by Yoav Raz from Digital Equipment Corporation (DEC), provides an effective general solution for global (conflict) serializability across any collection of database systems and other transactional objects, with possibly different concurrency control mechanisms. CO does not need the distribution of conflict information, but rather utilizes the already needed (unmodified) atomic commitment protocol messages without any further communication between databases. It also allows optimistic (non-blocking) implementations. CO generalizes Strong strict two phase locking (SS2PL), which in conjunction with the Two-phase commit (2PC) protocol is the de facto standard for achieving global serializability across (SS2PL based) database systems. As a result, CO compliant database systems (with any, different concurrency control types) can transparently join existing SS2PL based solutions for global serializability. The same applies also to all other multiple (transactional) object systems that use atomic transactions and need global serializability for correctness (see examples above; nowadays such need is not smaller than with database systems, the origin of atomic transactions).The most significant aspects of CO that make it a uniquely effective general solution for global serializability are the following:Seamless, low overhead integration with any concurrency control mechanism, with neither changing any transaction's operation scheduling or blocking it, nor adding any new operation.Heterogeneity: Global serializability is achieved across multiple transactional objects (e.g., database management systems) with different (any) concurrency control mechanisms, without interfering with the mechanisms' operations.Modularity: Transactional objects can be added and removed transparently.Autonomy of transactional objects: No need of conflict or equivalent information distribution (e.g., local precedence relations, locks, timestamps, or tickets; no object needs other object's information).Scalability: With ""normal"" global transactions, computer network size and number of transactional objects can increase unboundedly with no impact on performance, andAutomatic global deadlock resolution.All these aspects, except the first two, are also possessed by the popular SS2PL, which is a (constrained, blocking) special case of CO and inherits many of CO's qualities.
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