New version - v3.5 beta

Hi guys, after some weeks of hard work I got a beta version of LiteDB v3.5. I’m not releasing on nuget yet because I will do more tests on changes. This new version has some break changes (all source are in dev branch).

The main goal of this version is fix concurrency problems that LiteDB has in v2.x and v3.x. In order to do this I had to change some features.

Changes

• Remove transactions (break-api)
• Remove physical journal file (store journal pages after file ends)
• Remove auto-id register function for custom type (break-api)
• Remove index definitions on mapper (fluent/attribute) (mark as obsolete)
• Remove auto create index on query execution. If the index is not found do full scan search (use EnsureIndex on initialize database is better solution)
• NET45 compiles as NET35
• Update to VS2017

Features

• Add auto-id in engine level with pre-defined common types
• Add collection sequence (ulong) to use in engine level auto-id
• Implement FilterDocument option in all query implementations (full scan document)
• In Query.And use only one index side with full scan on other
• Print query execution plan in Query.ToString() Seek([Age] > 10) and Scan([Name] startsWith "John")
• Convert Query.And to Query.Between when possible
• Add support to Query.Between open/close interval
• QueryLinq for non resolved linq expression on visitor col.Find(x => x.Id < 10 && x.Name.Length > 10) will works using Id index and linq expression execution of Name.Length > 10

Also, I added a new LiteDB.Perf to test concurrency problems.

If you want contribute, fork my dev branch and change LiteDB.Perf to try get concurrency this error: Unable to cast object of type ‘LiteDB.EmptyPage’ to type ‘LiteDB.HeaderPage’. Tell me here in this issue that I will investigate.

Let’s turn LiteDB into a rock solid database 😄 🎉

Here, some issues that refer this concurrency problem: #641 #650 #619 #639 #592

Thanks!

[mbdavid]

Ok, created a CRUD webapi example and run over stress tool. All operations (Find, Insert, Update, Delete) and until now no problems. Tested over multi process and multi thread.

https://github.com/mbdavid/LiteDB.WebApi

Multi thread are 5 times faster than multi process (avoid open/close file + cache)

[lbnascimento]

Hi! With the objective of organizing our issues, we are closing old unsolved issues. Please check the latest version of LiteDB and open a new issue if your problem/question/suggestion still applies. Thanks!