|Stable release||PSQL v11 SP3 / January 2013|
|Available in||English, Japanese|
|Type||DBMS, RDBMS, NotOnlySQL|
|License||Proprietary software, trial editions available|
Pervasive PSQL is an ACID-compliant DBMS developed by Pervasive Software. It is optimized for embedding in applications and used in several different types of packaged software applications offered by independent software vendors (ISVs) and original equipment manufacturers (OEMs). It is also optimized for software as a service (SaaS) deployment due to a file-based architecture enabling partitioning of data for multitenancy needs.
Pervasive PSQL runs on system platforms that include Microsoft Windows, Linux, and Mac OS X. Both 32-bit and 64-bit editions of Pervasive PSQL are available. Editions are also specifically designed for different computer networking deployment needs, such as workgroup, client-server, and highly virtualized environments, including Cloud computing.
- 1 Uses and customers
- 2 DBMS architecture
- 3 Additional features
- 4 Interfaces
- 5 Tools
- 6 Versions
- 7 Editions and licensing
- 8 Limitations
- 9 References
- 10 See also
Uses and customers
Pervasive PSQL has a world-wide presence, but because Pervasive PSQL is an embedded database, its extensiveness is not well known. “Although Pervasive PSQL has been available for more than twenty five years, not many know of its existence. Competing products such as Oracle and Microsoft SQL Server are, without a doubt, better known and more noticeable. This obscurity is undeserved, because the number of installations worldwide is impressive. ...Organizations buy applications from the ISVs and VARs without knowing that Pervasive PSQL is the engine running all their applications.” “The company has 3,500 partners worldwide, including roughly 200 OEMs and 45 distributors who provide some of the traditional services a value-added reseller does, such as training and consulting work.”
Examples of Pervasive distributors include Goldstar Software for the US market, SOS Software Service AG for the German, Swiss, and Austrian market, DSCallands and Southdown House Software Ltd. for the United Kingdom and Irish market, Poly-Asia e-Technology for the Chinese and Southeast Asian market, AG-TECH for the Japanese market, and Stern Software for the South American market.
Pervasive PSQL is embedded by OEMs like Sage, ABACUS Research AG (Switzerland), and Unikum (Sweden) in packaged software applications that address the accounting, finance, retail, point-of-sale, entertainment, reservation system, and medical and pharmaceutical industry segments. “Users include Novell, Microsoft, PeachTree Software, Fair Isaac, Disney World, Radio Shack, Cardiff and others.” The accounting industry forms a large part of the Pervasive PSQL market. “In the year ended June 30, 2007, approximately 20 percent of database revenues were from sales related to applications from such vendors as Sage, Intuit, Exact Software, Cyma Systems and Epicor.” An example of the use of PSQL in the medical industry is WebMD.
Historically, Pervasive PSQL has served as a DBMS for the small- to medium-sized business (SMB) commercial section. “According to Wayne Kernochan, senior analyst for Illuminata, 'Pervasive takes a different direction from enterprise databases in several different areas, with positive results for low-IT users.'...'Pervasive PSQL is particularly useful and offers especially low TCO in mass-deployment architectures, wherein multiple workgroups or branch offices in multiple localities each use a local server which may be linked back to a central server,’ added Kernochan.”
The central architecture of Pervasive PSQL consists of two database engines: (1) the storage engine, known as MicroKernel Database Engine (MKDE) and described by Pervasive Software as a transactional database engine and (2) the relational database engine, known as SQL Relational Database Engine (SRDE). Both engines can access the same data, but the methods of data access differ. “On the one hand, you can program against the database using standard ANSI SQL. …But Pervasive also allows you to go under the hood and bypass SQL totally….With Pervasive you can use low-level operations to access the data directly.”
MicroKernel Database Engine
Pervasive’s transactional database engine, the MicroKernel Database Engine, interacts directly with the data and does not require fixed data schema to access the data. It uses key-value store to store and access the data. Calls to the MKDE are made programmatically with Btrieve API rather than through the use of a query language; therefore, Pervasive PSQL does not have to parse the request. This places the MicroKernel Database Engine in the category of NotOnlySQL databases. Low-level API calls and memory caching of data reduce the time required to manipulate data.
The MKDE operates in complete database transactions and guarantees full ACID (Atomicity, Consistency, Isolation, Durability). If a transaction does not fully run its course due to an external event such as a power interruption, the data remains in the state in which it existed before the transaction began to run.
In the MKDE, records are stored in files which are roughly equivalent to the tables of a relational database engine. It supports multiple keys on a record and therefore multiple indexes in the file. The MKDE caches data in memory to facilitate performance. When a call is made to the MKDE, cached data is searched first; physical storage is searched if there is no cache of the data. Configuration settings for caches can be pre-configured by ISVs to optimize Pervasive PSQL performance for their applications.
Relational Database Engine
The second database engine, the SQL Relational Database Engine or SRDE, operates in a manner similar to other relational database engines, that is, through the support of Structured Query Language queries. SRDE parses SQL queries and sends them to the MKDE to run.
The SRDE implements SQL-92. Significant other features include relational integrity, database security, and temporary tables. SRDE extends its functionality by supporting stored procedures, user-defined functions, and triggers.
Pervasive PSQL provides the following additional features:
- Multi-core processor aware
- IPv4 and IPv6 support
- Row-level locking
- Record and page compression
- Over-the-wire encryption and data encryption
- Cluster environments compatibility
- I18N support, code page (including UTF-8) translation between data files and SQL clients, Unicode support in Btrieve API, Japanese localization
- Data backup agents or enablers with Pervasive Backup Agent and Pervasive PSQL VSS Writer
- Data auditing with Pervasive AuditMaster
- Data replication with Pervasive DataExchange
Pervasive Software provides the management interfaces Distributed Tuning Interface (DTI) and Distributed Tuning Objects (DTO), a Component Object Model (COM) adapter pattern (wrapper) for the DTI. These provide application programming interfaces for configuration, monitoring, and diagnostics of Pervasive components. COBOL can also provide component management through a COBOL connector that can talk to DTI.
All other interfaces exist for data manipulation purposes.
- Btrieve, Java Class Library (JCL), COBOL, and ActiveX provides direct access to the MicroKernel Database Engine (MKDE).
- ADO.NET; ODBC v3.51 and JDBC 2 for Core, Level 1, and Level 2; and OLE DB provide access to the SQL Relational Database Engine (SRDE).
- Pervasive Direct Access Components (PDAC) are a set of Visual Component Library (VCL) components that enable direct access to both MKDE and SRDE for Embarcadero Delphi and C++ Builder environments.
Pervasive Control Center (PCC) is the main utility that enables the user to create and manipulate databases and tables, to access servers and clients, to set configuration, properties, and to edit data. Through PCC, the user can access a series of other utilities:
- License Administrator utility handles license management activities.
- Notification Viewer utility displays licensing-related messages logged by the PSQL engine.
- Monitor utility checks and displays activities and attributes of both engines, including resource usage, session information, and communication statistics.
- Pervasive System Analyzer utility tests the connections between the engines and within the network and displays information about system components.
- Maintenance utility enables users to create and edit schema-less files.
- Rebuild utility enables users to convert file formats and rebuild files in its MKDE file format.
- DDF (data definition file) Builder utility enables SQL users to create and modify table schemas for data stored in the MKDE, thus providing relational access to the data.
- Query Plan Viewer enables SQL users to analyze query plans for optimization.
- Function Executor assists developers with development, testing, and debugging by simulating direct API operations into MKDE and providing a view into the schema-less data.
See Btrieve, beginning with Pervasive.SQL 7.
Editions and licensing
There are four editions of PSQL: Pervasive PSQL Client, Pervasive PSQL Workgroup, Pervasive PSQL Server, and Pervasive PSQL Vx Server.
- Pervasive PSQL Client is designed for use with Pervasive PSQL Server and Pervasive PSQL Vx Server in a client-server network.
- Pervasive PSQL Workgroup edition is intended for single-user or small workgroup, peer-to-peer, installations.
- Pervasive PSQL Server edition is intended for configurations that have at minimum ten concurrent connections and it is scalable up to thousands of concurrent network users in client-server network and web-based applications on the enterprise level.
- PSQL Vx Server runs under hypervisors in a VM environment. It is designed for customers “who need support for highly virtualized environments enabling live migration, fault tolerance, high availability and cloud computing.”
- In user-count licensing, each product key specifies a licensed user. At any given moment, that many users can be connected to the engine.
- Capacity-based licensing is based on the amount of processing performed by the database engine. It measures data in use and sessions in use. This license model is designed to facilitate Cloud computing and highly virtualized environments.
Both PSQL Server and PSQL Workgroup use a user-count licensing model, while PSQL Vx Server uses capacity-based licensing.
- Pervasive PSQL lacks some of the data warehousing, data mining, and reporting services built into database engines such as MySQL and Microsoft SQL Server.
- Pervasive PSQL lacks Unicode support in the RDBMS layer.
- Pervasive PSQL lacks the ability to perform distributed transactions.
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