Need help in migrate existing titan DB instance ,schema with data to another running titan DB instance in another server .
We created Titan DB instance (schema) using 0.5.4 version.
Is there any API provided by titan for migration ?
Thanks in advance
There are no push-button migration utilities in the Titan API. Most of the time, users write migration scripts in groovy to do data migrations. This might entail use of titan-hadoop in 0.5.4 or BLVP in Titan 1.0. In your situation, it doesn't sound like you need any of that. Just copy the data files of berkeleydb from your original server to your new server.
Related
I'm currently working on a project with some colleagues and a colleague of mine linked a database created in her postgreSQL server to our visual studio project, but we don't know how she can share the database with the rest of us, or how can we modify the database without having it.
We're using postgreSQL 14.
One option is to create your database in a cloud provider such as AWS.
You can take a look at: https://aws.amazon.com/rds/postgresql/
This way all of you will be able to access the database.
Currently I'm trying to find a method to use EF core 2.2 for data migration. After reading the instruction at:
https://learn.microsoft.com/en-us/ef/core/managing-schemas/migrations/
I realise that it only support DbContext.
At the moment, in my project I have mongoDBContext and IMongoDBContext for my database and I couldn't find any package that support them. I also try using Microsoft.EntityFrameworkCore.Design but it's not helping. Is there any solution for me to use mongoDbContext as the database provider, or any packages that support mongoDB as the database provider?
As for my attempt to create a migration file despite not having DbContext:
From my terminal
dotnet ef migrations add InitialCreate
Error
No DbContext was found in assembly '.Data'. Ensure that you're using the correct assembly and that the type is neither abstract nor generic.
Thank you so much!
MongoDb is schema-less storage.
Entityframework Migrations is use to update schema of the tables. Yes migrations can also run update/delete/insert part of migration but only because Sql is dependent on schema.
In addition EF is not supporting MongoDb since mongo db is not using sql, mongo db has his own api/language.
Yes recent updates of EFCore supports CosmosDb but only because CosmosDB can talk sql
To sum up.
If you need to modify schema probably your MongoDb design is wrong.
If you want to talk to MongoDb use https://docs.mongodb.com/ecosystem/drivers/csharp/
If you are not familiar with MongoDb use what you familiar with
Yes, Mongodb is shema-less storage. But a solution always has some sort of schema in your POCO/DDD typed/dynamic objects and related domain logic. And you may change these contracts over time. So with Mongo we have the ability to perform two types of migrations: upgrade scripts ( like with RDBMS) or on-the-fly document migration when documents are used. You definitely can use your MongoDB without changes in existing documents in projects like collections of metrics and IoT device data or highly dynamic objects but this is not always the case.
I'm using an orientdb server for developments. Work great. Has classes, about to add support for files, etc. I'm about to provision a server on Azure for orientdb for testing by external people.
Question is
What is the database migration plan as in how to move data between the test database and the development database? Currently, it is just data but soon files will be added. coming from EF background
you can simply make a copy of db folder from test instance to develop.
Alternatively you can do an export (in.gz format) from test and then import in develop
I am trying to find the best way to synchronize/migrate EF Code First databases from localhost to SQL Azure without using EFCF Migrations. I know that I could use this approach, but I want to look at different, less automagic options.
The following process, or variations of such, is the one I'd like to follow:
Develop locally, letting EFCF build the databse on localhost
Synchronize the local database with the stage database on SQL Azure using some tool
Run tests in the staging environment
Synchronze/migrate the database (local or stage) to the production database on SQL Azure
Using MySQL, this is a breeze. The MySQL Workbench can synchronize a schema model to the database in question, plain and simple. In this case, I don't have a schema model per se, but the database on localhost generated by EFCF could be concidered the schema.
Which tools are available to perform this task? Is it possible to do this using SSMS?
Update: How I did it:
After the tip from Craig to use a Visual Studio 2012 Database Project, I did the following:
Created an empty VS 2012 database project and set its target platform to SQL Azure
Did a new schema compare, source database = local db and target = database project
Updated the target. This brought the database project up to speed
Did a new compare, source= database project and target = SQL Azure stage db
Updated the target. This brought the SQL Azure stage db up to speed
This was exactly what I was looking for
The Visual Studio 2012 database project can do it, I do it all the time.
It's not free, but Red-Gate's SQL Compare would handle the schema replication
What would be a good choice for a local database to use with Entity Framework for an WPF application that needs local database.
I dont want to use MSSQL Server cos that'd be an overkill and or MSSQL CE cos few days back I was using SQL CE 3.5 and had all sorts of issues of it not supporting server generated IDs.
I've read MS Access has issues as well. and dont want to use SQLite either.
TIA
SQL Server Express sounds a good fit to me.
What about MySQL Embedded?
You can use either EF provider by Devart (it is a part of dotConnect for MySQL Professional), or the provider integrated into MySQL Connector /NET.