in-memory-database | 易学教程

How to isolate EF InMemory database per XUnit test

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问题 I am trying use InMemory EF7 database for my xunit repository test. But my problem is that when i try to Dispose the created context the in memory db persist. It means that one test involve other. I have read this article Unit Testing Entity Framework 7 with the In Memory Data Store and I have tried to setup the context in the constructor of my TestClass. But this approach doesn't work. When I run tests separately everything is OK, but my first test method add something into DB and second

How to shutdown Derby in-memory database Properly

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问题 I'm using derby as an embedded database. Furthermore, I'm using it's in-memory database option for my unit tests. What I can't figure out is how to properly shut down (A quick look at the code) the Derby database. I beleive I have it working for a standard database but I'm getting different exceptions when attempt similar code on a in-memory database. I'm going to omit details, I'll add them if other feel are needed. Basically, I'm trying to shut down my database in these two fashions where

redis-server in ubuntu14.04: Bind address already in use

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I started redis server on ubuntu by typing this on terminal: $redis-server This results in following > http://paste.ubuntu.com/12688632/ aruns ~ $ redis-server 27851:C 05 Oct 15:16:17.955 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 27851:M 05 Oct 15:16:17.957 # You requested maxclients of 10000 requiring at least 10032 max file descriptors. 27851:M 05 Oct 15:16:17.957 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted. 27851:M 05 Oct 15:16:17.958 # Current maximum

in-memory database in Python

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问题 I'm doing some queries in Python on a large database to get some stats out of the database. I want these stats to be in-memory so other programs can use them without going to a database. I was thinking of how to structure them, and after trying to set up some complicated nested dictionaries, I realized that a good representation would be an SQL table. I don't want to store the data back into the persistent database, though. Are there any in-memory implementations of an SQL database that

Why Spark SQL considers the support of indexes unimportant?

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问题 Quoting the Spark DataFrames, Datasets and SQL manual: A handful of Hive optimizations are not yet included in Spark. Some of these (such as indexes) are less important due to Spark SQL’s in-memory computational model. Others are slotted for future releases of Spark SQL. Being new to Spark, I'm a bit baffled by this for two reasons: Spark SQL is designed to process Big Data, and at least in my use case the data size far exceeds the size of available memory. Assuming this is not uncommon, what

In django, how do I call the subcommand 'syncdb' from the initialization script?

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I'm new to python and django, and when following the Django Book I learned about the command 'python manage.py syncdb' which generated database tables for me. In development environment I use sqlite in memory database, so it is automatically erased everytime I restart the server. So how do I script this 'syncdb' command?(Should that be done inside the 'settings.py' file?) CLARIFICATION The OP is using an in-memory database, which needs to be initialized at the start of any process working with Django models defined against that database. What is the best way to ensure that the database is

Alternative to the TimesTen in memory database [closed]

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问题 I just found "Has anyone published a detailed comparison between different in-memory RDBMSs?" that is related to my question. TimesTen (see also) is a In-Memory Database from oracle. It has a lot going for it including. Fast, consistent response time High transaction throughput Standard SQL, no application rewrite Persistent and recoverable High availability and no data loss However it is priced out of the reach of most people ($41,500.00 / Processor). So what alternatives are there, and what

View content of H2 or HSQLDB in-memory database

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Is there a way to browse the content of an H2 or an HSQLDB in-memory database for viewing? For example, during a debugging session with Hibernate in order to check when the flush is executed; or to make sure the script that instantiates the DB gives the expected result. Does it exist an addon or a library that you can embed with your code in order to allow this? Please, mention which one you're talking about (H2 or HSQLDB) in case you have an answer specific to one of them. Tomasz Nurkiewicz You can run H2 web server within your application that will access the same in-memory database. You can

redis-server in ubuntu14.04: Bind address already in use

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问题 I started redis server on ubuntu by typing this on terminal: $redis-server This results in following > http://paste.ubuntu.com/12688632/ aruns ~ $ redis-server 27851:C 05 Oct 15:16:17.955 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 27851:M 05 Oct 15:16:17.957 # You requested maxclients of 10000 requiring at least 10032 max file descriptors. 27851:M 05 Oct 15:16:17.957 # Server can't set maximum open

View content of H2 or HSQLDB in-memory database

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问题 Is there a way to browse the content of an H2 or an HSQLDB in-memory database for viewing? For example, during a debugging session with Hibernate in order to check when the flush is executed; or to make sure the script that instantiates the DB gives the expected result. Does it exist an addon or a library that you can embed with your code in order to allow this? Please, mention which one you're talking about (H2 or HSQLDB) in case you have an answer specific to one of them. 回答1: You can run