Building a Spatial Database in PostgreSQL
... “Much geospatial data is available on the web and in off-line archives, but it is complex, heterogeneous, and incompatible. Users must possess considerable expertise and special geographic information system (GIS) software to overlay or otherwise combine different map layers of the same geographic r ...
... “Much geospatial data is available on the web and in off-line archives, but it is complex, heterogeneous, and incompatible. Users must possess considerable expertise and special geographic information system (GIS) software to overlay or otherwise combine different map layers of the same geographic r ...
Advanced Database Techniques 2010
... increasing load and resources) – Sizeup (doubling the size does not double required resources) ...
... increasing load and resources) – Sizeup (doubling the size does not double required resources) ...
Slides
... • Schema: A description of the structure of an entire database, used by database software to maintain the database • Subschema: A description of only that portion of the database pertinent to a particular user’s needs, used to prevent sensitive data from being accessed by unauthorized personnel ...
... • Schema: A description of the structure of an entire database, used by database software to maintain the database • Subschema: A description of only that portion of the database pertinent to a particular user’s needs, used to prevent sensitive data from being accessed by unauthorized personnel ...
4. Programming the Access application
... You can also look for help on specific functions is the Contents page of VB Help; expand Visual Basic Language Reference, expand Functions, then expand the appropriate alphabetical category The following tables list selected functions. The examples can be tested in the Immediate Window ...
... You can also look for help on specific functions is the Contents page of VB Help; expand Visual Basic Language Reference, expand Functions, then expand the appropriate alphabetical category The following tables list selected functions. The examples can be tested in the Immediate Window ...
XTime Install Guide
... 4 Download the software .................................................................................................................................................. 5 5 Unzipping the files ......................................................................................................... ...
... 4 Download the software .................................................................................................................................................. 5 5 Unzipping the files ......................................................................................................... ...
Transactions
... transaction may not be serializable – it may find some records inserted by a transaction but not find others. Read committed — only committed records can be read, but ...
... transaction may not be serializable – it may find some records inserted by a transaction but not find others. Read committed — only committed records can be read, but ...
ppt
... pages have been flushed, and move forward to the end of the log. Any change that appears in the dirty page table is redone. • Undo phase: Starts from the end of the log and proceeds backward while performing appropriate undo. For each undo it writes a compensating record in the log. • The recovery c ...
... pages have been flushed, and move forward to the end of the log. Any change that appears in the dirty page table is redone. • Undo phase: Starts from the end of the log and proceeds backward while performing appropriate undo. For each undo it writes a compensating record in the log. • The recovery c ...
Database System Concepts, 6 th Ed
... the sum of A and B is unchanged by the execution of the transaction In general, consistency requirements include Explicitly specified integrity constraints such as primary keys and ...
... the sum of A and B is unchanged by the execution of the transaction In general, consistency requirements include Explicitly specified integrity constraints such as primary keys and ...
SQL Server Command
... session name is character based and is specified with the –s option. If the session name is not provided, a session ID must be provided instead. The session ID is numeric and is set using the –ID option. If the session name is specified instead of the session ID, the dta generates an ID anyway. The ...
... session name is character based and is specified with the –s option. If the session name is not provided, a session ID must be provided instead. The session ID is numeric and is set using the –ID option. If the session name is specified instead of the session ID, the dta generates an ID anyway. The ...
Basic Controller 8 database tasks for Oracle 9i servers Guideline
... 8 is configured to use an Oracle 9i server. NOTE: • This is an unofficial guide, and any IBM Cognos or Oracle official documentation takes precedence • There are many different methods of achieving the same thing, therefore this document should be taken as just a guideline – There may be a better me ...
... 8 is configured to use an Oracle 9i server. NOTE: • This is an unofficial guide, and any IBM Cognos or Oracle official documentation takes precedence • There are many different methods of achieving the same thing, therefore this document should be taken as just a guideline – There may be a better me ...
Triggers
... 12. DB2 has transition TABLES for set-oriented events as in Starburst. ORACLE does not have transition tables, it has only correlation variables NEW and OLD for ROW level trigger. 13. Names of the transition tables: INSERTED for INSERT event, DELETED for DELETE event, OLD UPDATED for before UPDATE e ...
... 12. DB2 has transition TABLES for set-oriented events as in Starburst. ORACLE does not have transition tables, it has only correlation variables NEW and OLD for ROW level trigger. 13. Names of the transition tables: INSERTED for INSERT event, DELETED for DELETE event, OLD UPDATED for before UPDATE e ...
Creating a Type 2 Slowly Changing Dimension
... – Reflect business changes – Maintain context between fact and dimension data – Retain sufficient data to relate old to new ...
... – Reflect business changes – Maintain context between fact and dimension data – Retain sufficient data to relate old to new ...
Oracle Database In-Memory with Oracle Database 12c Release 2
... Population is a streaming mechanism, simultaneously columnizing and compressing the data. Just as a tablespace on disk is made up of multiple extents, the IM column store is made up of multiple InMemory Compression Units (IMCUs). Each worker process allocates its own IMCU and populates its subset of ...
... Population is a streaming mechanism, simultaneously columnizing and compressing the data. Just as a tablespace on disk is made up of multiple extents, the IM column store is made up of multiple InMemory Compression Units (IMCUs). Each worker process allocates its own IMCU and populates its subset of ...
And all of a sudden: Main Memory Is Less Expensive Than Disk
... mixed enterprise workloads. Most of these solutions use main memory-resident data structure in order to provide sufficient performance. The reason is that disk-based data structures as they are used in most recent relational database have shown to be too slow compared to main memory-based solutions ...
... mixed enterprise workloads. Most of these solutions use main memory-resident data structure in order to provide sufficient performance. The reason is that disk-based data structures as they are used in most recent relational database have shown to be too slow compared to main memory-based solutions ...
Molecular Biology Databases: An Overview
... with by similarity and biology links (cf. Section 3) is often insufficient. Furthermore, such links are inefficient to manage: If n databases are to be linked this way, then the information to collect and to update is distributed over the n databases. The “meta-database” DBcat [20] is a better appro ...
... with by similarity and biology links (cf. Section 3) is often insufficient. Furthermore, such links are inefficient to manage: If n databases are to be linked this way, then the information to collect and to update is distributed over the n databases. The “meta-database” DBcat [20] is a better appro ...
Scalable Data Management in the Cloud: Research Challenges
... but =there are list(); list friends = get_friends(); foreach (friend in somefriends){ applications that are much easier to if(friend.status == friendstatus.confirmed){ //no conflict actual_friends.add(friend); }else if((friend.status implement with strong consistency. Many &= friendstatus.confirmed) ...
... but =there are list(); list friends = get_friends(); foreach (friend in somefriends){ applications that are much easier to if(friend.status == friendstatus.confirmed){ //no conflict actual_friends.add(friend); }else if((friend.status implement with strong consistency. Many &= friendstatus.confirmed) ...
here to as
... • More filtering has to be done, either in SQL or in Tableau • Each workbook needs to be specifically set up. • More Coding (SQL, T-SQL, Tableau functions) ...
... • More filtering has to be done, either in SQL or in Tableau • Each workbook needs to be specifically set up. • More Coding (SQL, T-SQL, Tableau functions) ...
Tuning I/O Subsystem: A Key Component in RDBMS Performance
... Different types of systems have different I/O patterns and require different I/O designs. Once the system is built, you should first tune for memory and then tune for disk I/O. The reason you tune in this order is to make sure that you are not dealing with excessive cache misses, which cause additio ...
... Different types of systems have different I/O patterns and require different I/O designs. Once the system is built, you should first tune for memory and then tune for disk I/O. The reason you tune in this order is to make sure that you are not dealing with excessive cache misses, which cause additio ...
Using Geographic Information Systems to provide better e
... digitalisation processes involve methods that are commonly described as “scanning”. A graphic model is sampled automatically without a user having to control the process. The information acquired is in raster data format stored in matrices that are not topologically structured by object criteria and ...
... digitalisation processes involve methods that are commonly described as “scanning”. A graphic model is sampled automatically without a user having to control the process. The information acquired is in raster data format stored in matrices that are not topologically structured by object criteria and ...
here
... feedback loop would close up the process of integration as any adaptive system requires. We refer to this concept as the model-based architecture. The Metadatabase Model [24, 26, 27, 28] is ...
... feedback loop would close up the process of integration as any adaptive system requires. We refer to this concept as the model-based architecture. The Metadatabase Model [24, 26, 27, 28] is ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.