I would like to know if there's a way for ehcache to detect a database update/insert (spring/java, hibernate web application) and refresh its cache with the current(latest) data from the database if not, what would be the best way detect a database update so as to keep the data between and cache and database in sync?
Caching tools (ehcahce , infinispan) provides the solution other way round, i-e, to refresh the cache with DB data in configured interval , for example : every 15 or 30 minutes. Don't use cache, if the data keeps changing continuously...
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I am using IntelliJ IDEA and JPA Buddy to generate entities from my database. However, every time I open an Entity from DB wizard, it takes a very very long time. Is it okay? Or something wrong with my database/IntelliJ IDEA or JPA Buddy?
My setup is:
Database: Oracle (~2000 tables)
IntelliJ IDEA: 2022.3.1
JPA Buddy: 2022.5.3
I have tried to recreate db connection and invalidate caches in the IntelliJ IDEA, same result.
It may happen due to a slow internet connection or many tables in the database (probably it is your case, 2000 is great number). Also, some database drivers are not showing their best side in this matter. The one way you can speed up your development process – is a "schema cache" option from JPA Buddy (1). Using it, you can generate the data model snapshot once and then use its local copy.
Just don't forget to refresh it when the database gets changed (2).
I have to deal with the following scenario for spring application with Oracle database:
Spring application uses the primary database. In the meantime the secondary database stores data for disaster recovery (from primary).
The first step is currently provided. At this moment I have to implement:
When the primary database gets offline application should change the connection to the secondary database).
The implementation should be programmatically. How can I achieve that without changing the code that currently exists? Is there any working solution (library)?
I think about AbstractRoutingDataSource and ping databases (e.g. every 5 seconds) but I'm not sure about this solution.
So, let's to summarize the issue. I was unable to use Oracle RAC (Real Application Cluster). If the implementation should be programmatically you can try AbstractRoutingDataSource approche.
I have implemented timer that pings current database every 1 second (you can use validation query and check if you can read from database... if no we assume there is no connection and we can switch a datasource).
Thanks to that I was able to change datasource on runtime when current datasource is offline. What is more important it was automatic.
On the other hand, there are disadvantages:
For short time user can see the errors if the database is not
switched yet.
Some part of application may stop working if it is not properly
secured against the lack of connection to the database.
I am using Infragistics IGGrid with remote type pagination, sorting and filtering to display the records in MVC. In the server, the session state mode is "SqlServer".
I wanted to fetch 100000 records from database and due to nature of the IGGrid remote type feature, it will always be hitting the database.
As per the client policy I cannot hit the db and cannot store fetched content in external file for pagination, sorting and filtering.
As of now I am using Session to store those records and its working fine in local environment but after deployment on the Dev server I am getting error like I have to use Serializable to handle session.
Is there any alternate way to handle those huge dataset smoothly.
I am using Laravel 5.5. I would like to store session data in a table. When the session is over, the data should be deleted. Can anyone help me accomplish this task?
I would suggest using Redis for storing and destroying session data within a Laravel application. One of the most apparent use cases for Redis is using it as a session cache.
If you are determined to store your session data in a database, check out this documentation that gives you the option on how to handle session data.
You need to change the session configuration file is stored in config/session.php to the database option and created the needed table.
What is the best way to implement caching layer on an Oracle DB for reads?
So that whenever the db get updated the cache gets too(consistency) and i can query the cache for reads(data),
And is Oracle SCN a good way to determine what changes have been made to the db so that it can be migrated to the cache, and
Apache KAFKA used as the connecting mechanism for data transfer?