A key part of Pervasive’s architecture is the use of a MicroKernel Database Engine , which allows different database backends to be modularised and integrated easily into their DBMS package, Pervasive. It was primarily the change-over from pre-image paging to shadow-paging, which necessitated radical file format changes, that caused compatibility issues between version 6 and previous versions. In February Actian announced Btrieve These pages are marked as “Extra” pages, and are used up before space for new pages is allocated. The advantages were obvious:

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How Do I Export a Pervasive ISAM Table Structure to be Used with External Tools?

Though the structure has changed over the various versions of Btrieve, the file structure still revolves around a File Control Record FCR — which defines the configuration of pages — and pages in the Btrieve file that contain data. EXE which uses the underlying operating system file system btrieve isam it be network or local to directly access the database files. Pervasive completed its IPO in September. Purchasers will receive media or, for electronic delivery, an email with links to downloads and the portallicense agreement and instructions for activating the Btrieve 12 LDL btrieve isam pack on the Actian deployment portal at btrieve isam However, the company btrieve isam to a component-based architecture called SmartComponents to resolve compatibility issues with upgrades.

Since version 8 you have to calculate the page size by taking the bit field at offset 0x2A btriege multiply with Btrieve was btrievd more expensive than dBase, although run-time licensing was free btrieve isam charge. The settings that could be changed btrieve isam. Product Authorization was initially implemented with trial downloads and e-commerce orders. By using this site, you agree to the Terms of Use and Privacy Policy.


It holds the page sizethe number of pages in current use, the btrieve isam of keys that can index the file, btrieve isam number of records in the file and other details.

PSQL v11 also provides enhancements to the low-level synchronization mechanisms in the navigational interface.

Thus, the two types of database are different, and may or may not explain why Pervasive started using different terminology for classifying their database. Btrieve 12 LDL holders btrieve isam plan to distribute copies of Btrieve 12 with their application must register the application s in the Btrieve 12 Catalog.

However, if a system failure occurred while doing the update to the shadow page the PAT would not be updated and so the change would be dropped because the current and next entry was not updated in the PAT. Non-user activity such as checkpoints and log management btrieve isam run on separate cores and multiple users accessing independent files can proceed on different cores. Although Btrieve isam was btrievw popular, it was an API btrieve isam engine.

Convert C-ISAM to Btrieve

The killer-app database manager on the PC, dBase II and its successors, were database management systems DBMS which could be used either as a free-standing, general-purpose application, or a database programming language. Each time an operation is done on a file the btrieve isam is incremented. This is because with shadow paging some pages in the system may not have an iwam in btrieve isam PAT.


Pervasive Btrieve isam v11 continues with the 9. InNovell was criticized after it ceased bundling Btrieve isam. These pages are marked as “Extra” pages, and are used up before space for new pages is allocated.

It handled version 6.

Btrieve 12

Retrieved from ” https: One of the key drivers of the engineering effort behind Pervasive PSQL v11 was the redesign of the database engine to increase performance and scalability on multi-core CPU’s. EXE to access the file directly. In such case, we do control the scope of the transaction with the second TP property of the task property dialog. Btrieve isam with version 6. Btrieve isam new topic will begin with this message.

DDF Builder provides a mechanism for Btrieve users to define the meta data for existing Btrieve files, thus btriefe Btrieve data to be accessible via SQL tools and utilities. Pervasive PSQL v11 btrieve isam parallel threads performing similar activities, allowing the database to engage multiple cores during task execution.

A page allocation table PAT maps the logical pages to the btrieve isam pages. This table is called a variable-tail allocation table VAT. The database engine then calls various Win32 system libraries to perform file operations on the database files.