Illustra Information Technologies, "Illustra User's Guide," , Illustra Information Technologies, Oakland, CA. 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....on the application, different of them are used. It is not feasible to support all of them as database base types requiring expensive format conversions. Extensible Database Systems: The above problems have fostered the devel opment of extensible database systems, and commercial products (Illustra[7], Informix[17] start becoming available. The idea is to allow the user to extend the system by incorporating user specific code into the DBMS kernel. These user extensions are often referred to as data blades allowing the subimage to be composed in the server environment. This avoids copying ....

Illustra Information Technlogies, Oakland, CA. Illustra User's Guide, October 1995.

....to show that it is practical to build IP indexes for large time sequences. An interesting comparison of the IP index with conventional secondary indexes is also given. The s operator and its corresponding optimization rules can be plugged into extensible database systems such as Illustra [11] or PREDATOR [21] where extensible cost based or rule based optimizations are supported. For example, Illustra s time series data type [25] could benefit from the s operator. This paper is organized as following: Section 2 discusses related work. Section 3 shows how the s operator works for ....

....large A(v)s, which is needed in time window queries. We will then develop the cost model for the s operator based on the new data structure, so that query optimization concerning the s operator can be carried out by the database system. Since many extensible database systems (such as Illustra [11] and PREDATOR [21] support plug in of new abstract data types together with their storage, manipulation methods and their indexes, the IP index, the s operator and its cost model can be plugged into those systems to support queries on time sequences or any 1 D sequence data [20] New functions ....

Illustra Information Technologies, Illustra User's Guide, June 1994.

....objects c satisfying o r c. Refinement Step: From the set of candidates, return all objects o that fulfill o r o as well as pred(o ) G DB r G DB r Figure 6. Algorithm neighbors 5 Performance Evaluation We implemented the database primitives on top of the commercial DBMS Illustra [Ill 97] as a client process. A neighborhood index was realized as a relational table indexed by a B tree on the Object ID attribute. Whenever no neighborhood index is applicable, our implementation of the database primitives uses an R tree which is provided by the Illustra 2D spatial data blade. We ....

Illustra Information Technologies, Inc.: "Illustra User's Guide", Release 3.3.1 for HP UX 10.1, 1997.

....take advantadge of versions in two ways: i) they release their read locks before executing their read part, 1 In [BHG87] it is called multiversion mixed method; multiversion two phase locking is reserved for a different protocol. 2 e.g. SQL 92 Rdb ( HE91] Postgres and Illustra ( Ill94] Oracle when used with SET TRANSACTION READ ONLY ( Par89] 3 Several products (e.g. Borland s InterBase 4 ( Tha94] Microsoft s Exchange System) offer the so called Snapshot Isolation in which update transactions read old versions and write new versions. Oracle provides a similar ....

Illustra Information technologies, Oakland, CA. Illustra user's guide, 1994.

....various production systems. The system is designed to support third party transfer of data from the archive directly to the requesting system across parallel I O channels. To gain insight into issues associated with database mass storage integration, we built a prototype using Illustra (Illustra [4]) as the database engine and NSL UniTree as the mass storage system. NSL UniTree is a hierarchical archival storage system currently running in production mode at SDSC. The hardware platform consists of a single IBM RS 6000 99J workstation, a disk cache of 100 GB, two StorageTek tape silos and 8 ....

Illustra - Illustra Information Technologies Inc, "Illustra User's Guide",1995.

....Other Multi Version Systems There are other models of multiversioning. Some commercial products maintain versions of objects but restrict Snapshot Isolation to read only transactions (e.g. SQL 92, Rdb, and SET TRANSACTION READ ONLY in some other databases [MS, HOB, ORA] Postgres and Illustra [STO, ILL] maintain such versions long term and provide timetravel queries) Others allow update transactions but do not provide first committer wins protection (e.g. Oracle Read Consistency isolation [ORA] Oracle Read Consistency isolation gives each SQL statement the most recent committed database ....

Illustra Information Technologies, "Illustra User's Guide," , Illustra Information Technologies, Oakland, CA. 1994.

....implemented on SUN workstations running SunOS 5.4. VOM s (or, in earlier prototypes that did not exhibit versioning, OM s) have been implemented on top of various Storage Managers, including Saberel (a proprietary semantic database) Postgres [27] an extended relational database) and Illustra [10] (an object relational database) Currently, HOSS Versioned Object Managers exist for the latter two Storage Managers. The VOM and ASM provide data object and structural object services respectively. Since the ASM is a VOM client, however, not threading both processes inside the same data space ....

Illustra Information Technologies, Inc. 1995. Illustra User's Guide. Oakland, CA: Illustra Information Technologies, Inc.

....constraints. Therefore, an object may be removed even if it is a component of a composite object. Referential integrity through the notion of external keys is supported in relational DBMS [8] However, the notion of composite objects is not supported by SQL nor by the object extensions of SQL [11, 17, 22]; therefore, exclusiveness and existence constraints are not supported by these data models. Our goal is to define a composite object model supporting: i) referential integrity with the same repair actions supported by SQL; ii) exclusiveness constraints and existence constraints in a more ....

Illustra Information Technologies, Oakland, California. Illustra User's Guide. Release 2.1.

....must be loaded into the database and connected to the appropriate experiment object and its inputs. For example, objects describing the growth of each plant must be connected to the objects describing the plants. Although the load utilities offered by the object relational systems Illustra [Ill94] and UniSQL [Kim94] solve some of the problems posed by relationships, they are incapable of connecting new objects to existing objects during the load. Instead, those relationships must be created by update statements after the load is complete. Although batch update statements may be used, the ....

....description specifies the existing objects to which it should be connected. We propose using queries as the most natural means of identifying existing objects. For example, it is already possible to use queries to connect objects when creating them with individual insert statements in Illustra [Ill94] although not when creating them during a bulk load. We further suggest using query functions to define similar queries. A query function defines a query where some or all of the query constants are parameters to the function. Query functions are common in relational database systems, such as ....

[Article contains additional citation context not shown here]

Illustra Information Technologies, Inc. Illustra User's Guide, June 1994.

....latches [MoLe89] instead of locks when locking the tree nodes for physical consistency. 6 Performance Measurements To asses the performance of R link trees relative to non link style R tree concurrency mechanisms, we implemented R link trees as a new access method for the Illustra database engine [Illu94] and compared it to the existing R tree implementation. The performance numbers were obtained from concurrent client processes accessing a fully functional database system, as opposed to simulation results or calls to a stand alone access method implementation. The existing R tree implementation ....

Illustra Information Technologies, Inc., "Illustra User's Guide," Illustra Server Release 2.1, June 1994.

No context found.

Illustra Information Technologies, "Illustra User's Guide," , Illustra Information Technologies, Oakland, CA. 1994.

No context found.

Illustra Information Technologies. Illustra User's Guide. 1995.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC