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Is there any sense in creating materialized views from one schema to another in same database ? Will a public synonym or a simple view suffice? Please suggest
The question is about the same as if you ask if it makes sense to have the same table in another schema of the database. If anybody who can access materialized view / table has access to the schema why bother? And even if not I would ask why they have no access to the schema.
Your question: Will a public synonym or a simple view suffice? That said, I also would say yes.
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My goal is to create a social media and I'm planning to use microservice architecture. I want to create user-service and post-service. Post service will get a user id and return their posts.
In the database side, I was thinking about using a relational database, having a "post" table with user_id as a foreign key in it. However I heard that microservices should have different databases. So "user" and "post" tables should be in seperate databases.
In that case why would I choose a relational database instead of a non-relational database? Referring to a primary key in a different database with a foreign key in the current database makes no sense for me.
In most cases multiple tables might be required for each service (e.g. your user-service would have many other tables related to users and not just one table) and having relational database helps maintaining relations amongst those table of single service.
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We have some queries that always return the same result.
For example, query for retrieving all user roles of our system. The result is constant since server is up.
I'm looking for the best way to store such data.
I think about calling table creating script on server start up.
Or to write stored function which will create and fill a table if it doesn't exist and retrieve data if it does.
May be there are better alternatives?
Sounds like you should look into Materialised views.
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I have a NSF file of a lotus database. The objective is to give up the legacy lotus notes database and migrate it to relational database oracle. Do any one have expertise in this area to give a step wise process to carry out migration from lotus notes to oracle db.
10 years ago I integrated Domino and Oracle and well it was pretty impressive.
I googled migrate from domino to oracle and didn't find much more than the LEI (or DECS) to allow connection of DATA between the 2 systems.
some steps:
1 analyze the NSF: size (MB or GB ?) number of form/view logic in code (my 5 cents opinion find someone that really use the DB that explain what they use in it !)
2 form/view will be table and requests in Oracle
3 data migration : all text date ... will be strate forward. BUT attachment Rich Text and in lined image will be painfull
4 logic well you will have to rewrite all no formula/lotuscript/xpages to J2EE or else
read also http://searchdomino.techtarget.com/answer/Migrating-from-Domino-to-Java-and-Oracle
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I am creating a database that stores GPS data. As soon as the database updates with a data point , I want the server to check to see if that point is within a certain area and send a message or update another database (haven't decided what action it should take yet). Is this event-driven operation possible in PL/SQL? I am only familiar with passive querying and running scheduled scripts.
Yes there is such feature called database triggers. On insert or update (actually there are much more event types) of the data you can check if some conditions are met and call PL/SQL procedure to handle the event.
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I have a site http://www.ratingscorner.com/colleges
i have an issue like performance. I think the site is slow. Please see if the speed is feasible . Its o a shared server. what things should i do to increase site/DB performance.
when i try explain command on select command on main table it says like
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE xyz ALL NULL NULL NULL NULL 1722 Using where
is this okie?
Running YSlow can usually be enlightening.