Snapshots of read-only... why not?

I would like to be able to open a transaction as a read-only snapshot would be "invisible" to other transactions that occur. This is an old thread asked the same question:

Snapshot read-only for an accessible environment in writing in the same process

First question, is that always accurate information (that is, still impossible)?

Second question, are there any plans to add support for the "snapshot" read-only transactions?

Probably, if I tried to open a new environment in the same process using an EnvironmentConfig with setReadOnly (true), which fails because it is a property immutable, correct?

I thought BDBJE was more or less structured, newspaper that would be average 'snapshot' transactions should be easy to implement. What is actually more difficult than it sounds?

Thank you

-Archie

Hi again,

1. Yes, it isn't always a feature of the BDB I.

2. No, there is no plan for it, especially because your application is the only one we received, sorry!

As Linda said in the post you referenced, a way of providing it would be adding MVCC, which is quite an important, difficult feature. But another way, off the top of my head, would be to allow an environment of openness so that it does NOT share the cache (the Btree in memory) with other objects in the environment that are already open in this process. This would have exactly the same effect as the use of a separate process.

I read your older post, and I understand your reasons to use a snapshot. I guess you can do that with a separate process, but has drawbacks and so you do not want to do it all using a single process. Is this fair?

-mark

Tags: Database

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