Database Management for Smalltalk

Archive for the 'Articles' Category

Wed 9th Jan 2008   12:01 AM
posted by John Clapperton

Transparent Persistence

+ Transaction Processing…

Smalltalk is pure object-oriented programming for complex business and technical applications, but the benefits of this can be lost in the well-known ‘impedance mismatch’ with relational databases.

The VOSS open source virtual object storage system extends Smalltalk with integrated database management, providing transparent multi-user access and transaction processing of persistent, versioned, Smalltalk objects directly accessible by normal programming, with efficient persistent Btree collection classes, including the multi-key/multi-value/key-set VirtualDictionarySet for aggregation and query-building.

  • Multi-process, multi-machine transactional access to distributed objects
  • ACID transactions with two-phase commit, logging and rollforward crash recovery
  • Persist clustered complexes of any Smalltalk classes except block closures
  • Historical object versioning, MVRC repeatable read, MVCC concurrency control
  • Automatic object locking with transaction rollback & retry on deadlock time-out
  • Automatic change detection, no lock conflicts with sub-transactions, short read-locks
  • Multi-key/multi-value/key-set Btree VirtualDictionarySet with query-building methods
  • Continuation Transactions manage alternative futures for design or what-if
  • Long Continuation Transactions may be persisted prior to ultimate commit/rollback
  • Web server / application process rendezvous
  • Distributed copying, parented copying, identity-exchange, checkout, read-only etc
  • 24×7 operation, with concurrent variable-rate incremental foreground & background garbage collection and snapshot backup of the set of distributed virtual spaces.
  • Up to 150 logged & flushed transactions per second on 3GHz P4 IDE hardware
  • Terabyte 64-bit object id and addressing default, configurable up to 128-bit
  • Dual Licensing - Open Source GPLv3 and/or Supported Commercial Licence

…Seamless Smalltalk Solutions Download VOSS



(C) Logic Arts Ltd 2017

Wed 13th Sep 2017   02:09 PM
posted by John Clapperton

StsDebugger is incompatible with VOSS, causing random image hangs. These are probably caused by the tool tip hovering over a variable which references a VORef proxy, causing the tooltip process to wait indefinitely at the VOStorageManager’s process mutual exclusion shell (VOSMShell). It is recommended therefore to use DbgDebugger. Evaluate the following statement before a debugging session:

System startUpClass debuggerClass: DbgDebugger.

Thu 30th Mar 2017   01:03 AM
posted by John Clapperton

The next version of VOSS 3.1 includes a new collection class, the high concurrency Btree VOhcVirtualDictionary, with transparent conversion of existing VirtualDictionary instances within VirtualDictionarySet etc.

Email me at jc@logicarts.com if you would like to join the beta test.

John

Mon 18th May 2015   05:05 PM
posted by John Clapperton

VOSS 3.150.15 for VASmalltalk 8.6.2, 8.6.1, 8.6.0

Download VOSS 3.150.15 here