Recent questions tagged Database

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database - SQLite insert speed slows as number of records increases due to an index

Original question Background It is well-known that SQLite needs to be fine tuned to achieve insert speeds on the ... least 10k inserts / second. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - What are the differences between the BLOB and TEXT datatypes in MySQL?

What is blob and what is text? What are the differences? When do I need to use blob and when do I need text as ... where L < 224. What is L? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - What is a View in Oracle?

What is a view in Oracle? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Can't connect to MySQL server on '127.0.0.1' (10061) (2003)

I know this question was asked a lot before but I tried some of the solutions which were given and nothing ... the same. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How to simulate a DB for testing (Java)?

I'm programming in Java and my applications are making a lot of use of DB. Hence, it is important for ... differ from one platform to another. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Still Confused About Identifying vs. Non-Identifying Relationships

So, I've been reading up on identifying vs. non-identifying relationships in my database design, and a number ... design. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How do you debug MySQL stored procedures?

My current process for debugging stored procedures is very simple. I create a table called "debug" where I ... debug MySQL stored procedures? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How to find out the MySQL root password

I cannot figure out my MySQL root password; how can I find this out? Is there any file where this ... have directadmin directory in local. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Can I do transactions and locks in CouchDB?

I need to do transactions (begin, commit or rollback), locks (select for update). How can I do it in a ... . Can I solve this with CouchDB? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Liquibase lock - reasons?

I get this when running a lot of liquibase-scripts against a Oracle-server. SomeComputer is me. Waiting for ... ? Anyone has any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How does the HyperLogLog algorithm work?

I've been learning about different algorithms in my spare time recently, and one that I came across which ... in this HyperLogLog algorithm. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Proper Repository Pattern Design in PHP?

Preface: I'm attempting to use the repository pattern in an MVC architecture with relational databases. I've recently ... this is best handled? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How can I update a cell value in a dB table, using SQL Server CE and C# (Visual Studio 2010)

I'm writing a small application for college, a video rental application. I have no problems reading from the ... I open the table itself. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Minimum no of tables that exists after decomposing relation R into 1NF?

Consider the relation R(A, B, C, D, E, F, G) with the following types of attributes:- Total No of ... Can you explain in formal way, please? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Android SharedPreferences limitations?

I developed a game on Android. I am currently saving most of the game stats in a Database. However the app ... around 40 values, all integers. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - wikidata get all properties with labels and values of an item

My question is how I can extract all properties and their respective labels that are also rendered on the webpage ... everything to one query? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Limit an sqlite Table's Maximum Number of Rows

I am looking to implement a sort of 'activity log' table where actions a user does are stored in a sqlite table ... /events (rows) of the table. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - MongoDB update with condition

I'm trying to update some field in my collection depending on a condition. I want to set field active to ... this update as a single command? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - NULL permitted in Primary Key - why and in which DBMS?

Further to my question "Why to use ′not null primary key′ in TSQL?"... As I understood from other ... Understood By SQLite: CREATE TABLE See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - Storing Images : DB or File System -

I read some post in this regard but I still don't understand what's the best solution in my case. I'm ... the DB approach is the right choice? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How to disable Django query cache?

In my Django application, I repeatedly run the same query on my database (e.g. every 10 seconds). I then ... execute the query on the DB ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - SQL recursive query on self referencing table (Oracle)

Lets assume I have this sample data: | Name | ID | PARENT_ID | ------------------------ ... data represented by parent keys in same table See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - What is the recommended way to delete a large number of items from DynamoDB?

I'm writing a simple logging service in DynamoDB. I have a logs table that is keyed by a user_id hash and ... have it delete everything for me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - What's wrong with nullable columns in composite primary keys?

ORACLE does not permit NULL values in any of the columns that comprise a primary key. It appears that the ... more of a technical limitation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database design - MySQL ENUM type vs join tables

My requirement A table needs to maintain a status column. This column represents one of 5 states. initial design I ... with using the ENUM type? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How to schedule a stored procedure in MySQL

I have this stored procedure. How can I run this for example with intervals of 5 seconds? Like a routine for eliminate data ... ()) < 1 ; END GO See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database - How can I find MAX with relational algebra?

Working with databases, how can I find MAX using relational algebra? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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database design - Why use multiple columns as primary keys (composite primary key)

This example is taken from w3schools. CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, ... key in a given table? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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