Hi Team, I am trying out speement for my curiosity and testing it's amazingness to try it out in future projects. I have just setup a sample application using the tutorial page title
and in title
I ran the query and strangely I'm getting two queries in the output.
Can someone help why two queries are being made while it should be ideally 1 query as it is there in the tutorial.
and in title
I ran the query and strangely I'm getting two queries in the output.
2021-09-26T20:34:32.576Z INFO [main] (#APPLICATION_BUILDER) - Speedment (Open Source) version 3.2.6 by Speedment, Inc. Specification version 3.2 (Channing), License: Apache-2.0
2021-09-26T20:34:32.586Z INFO [main] (#APPLICATION_BUILDER) - Java Virtual Machine Specification 11 by Oracle Corporation. Implementation Java Platform API Specification 11.0.9 by Oracle Corporation
2021-09-26T20:34:32.594Z INFO [main] (#APPLICATION_BUILDER) - Available processors: 8, Max Memory: 4,211,081,216 bytes
Loading classcom.mysql.jdbc.Driver'. This is deprecated. The new driver class is com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
2021-09-26T20:34:34.546Z INFO [main] (#APPLICATION_BUILDER) - MySQL, 8.0.23, MySQL Connector/J mysql-connector-java-8.0.18 (Revision: fef2894d751d47223192b706977b4a5bc41e6be4), JDBC version 4.2
2021-09-26T20:34:34.770Z DEBUG [main] (#STREAM) - SELECT COUNT(*) FROM (SELECTfilm_id,title,description,release_year,language_id,original_language_id,rental_duration,rental_rate,length,replacement_cost,rating,special_features,last_updateFROMsakila.filmWHERE (rating= ? COLLATE utf8_bin)) AS A, values:[PG-13]
There are 223 PG-13 films in the DBCan someone help why two queries are being made while it should be ideally 1 query as it is there in the tutorial.
The idea is that we only want to return a single “long” and not all the fields.
As it turns out, it does not affect execution time significantly and consequently that optimization was not made.
And does it support batch operations? I just checked it doesn't I guess but this would be helpful for background batch jobs https://www.google.com/url?sa=t&source=web&rct=j&url=https://github.com/speedment/speedment/issues/539&ved=2ahUKEwjI2YDQ_6bzAhV08HMBHYM0BzcQFnoECAMQAQ&usg=AOvVaw03BXf6IFoU2iLLRlgi3sZZ
Stored procedures don't seem to be that much of an important feature unless the project requires high performance
Just tried a simple speedment example with MySQL 8 using Speedment OSS. My table has BIGINT type for Primary key and the generated code (in <table>SqlAdapter.java) is failing to compile as getBigInteger(int) is not a method available in java.sql.ResultSet. I used the speedment initializer to generate the project POM. Any pointers.. thanks.
In using the JoinComponent to get a join object and then subsequently streaming it, it is unclear where you specify operations like limit(), skip(), count(), sum() so they will execute in the database as part of the generated SQL query. Doing this on the join object seems like they will execute on the client side once all tuples (based on JoinComponent) are fetched? Are the same optimizations (for limit, skip, count etc) that are done for single-table streaming also done for join object?
In general, it is not specified exactly how queries are optimized and where they are executed. Depending on the join pipeline, operations may infact be executed on the database side. The best way to see is turing on logging for stream operations. Then you will see exactly how queries are rendered.
Limit, for example, is tricky do do with joins in the generall case.
Not sure if this can help you: https://www.baeldung.com/kotlin/java-8-stream-vs-kotlin
404 here. https://github.com/speedment/speedment/tree/master/example-parent. Not trying to be a jerk.
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Yep, looks like the nexus is down:
transfer failed for https://repo.speedment.com/nexus/content/repositories/releases/org/codehaus/mojo/maven-metadata.xml, status: 502 Bad Gateway
What a pity.
transfer failed for https://repo.speedment.com/nexus/content/repositories/releases/org/codehaus/mojo/maven-metadata.xml, status: 502 Bad Gateway
What a pity.
I am processing large volumes of data in batch (using Spring Batch and Spring Boot) where my job runs as multiple (identical) workers in different nodes in a k8s cluster. All workers need access to some read only data to do their processing. I am thinking of using Speedment DataStore to preload the readonly data for these workers. Looks like DataStore will need be loaded for each worker as it is part of the application. Is there a way to keep a common (readonly) DataStore for all the workers in the cluster. Would I need to create a dedicated speedment microservice app that runs in the cluster (with DataStore) that serves these requests from the worker clients. thanks
1 reply
Hi. This is an interesting question. By memory mapping the off-heap memory, it is possible to share the DataStore across processes that have access to the same file-system. As the data is immutable, there is no lock contention between threads/processes. However, this is not a standard feature. Please email me on minborg@speedment.com and we can discuss.
1 reply
It appers to be down. We are working on it
We have upgraded the Nexus version.
Thanks for reporting the issue.
The website too cant connect to the db
