Caching reporting data in the same transaction database vs using a data warehouse

We have a SaaS solution where each tenant has its own MySQL database. Now I'm designing a dashboard for this SaaS system and it requires some analytical charts. To obtain the data required for the chart, we can query each tenant's transaction data in real time from its database. and get updated grap...

P粉511749537 2024-02-26 19:20:23 0  1  400

How to clear database cache in mysql 8 innodb

I've tried running the same query multiple times on the same mysql8 database and table. I need to experiment to determine if tuning the query and/or the table itself can improve performance. However, after the first try, the response time is much faster, I think because the data is cached. mysql8inn...

P粉571233520 2023-08-27 23:46:28 0  2  655

How to store the analyzed dictionary data in the database in Python 3.5

{Code...} I am using the database linked by pymysql. The statistical data before was a single row, so I used this {Code...} Now it is multi-row. How do I save it to the database? The database has two fields, respectively. It is keywords, and count, which correspond to the contents in the dictionary ...

ringa_lee 2017-05-18 10:59:27 0  2  739

If mongodb is used as a persistent storage database, is it necessary to use redis for another layer of cache?

If mongodb is used as a persistent storage database, is it necessary to use redis for another layer of cache? ps: I have observed that the mongodb server process takes up more than 1g of memory when running even if the data volume is very small (capacity is more than 1g). Could it be that mongodb it...

滿天的星座 2017-05-16 13:19:03 0  3  1137

Concurrency, message queue, load balancing, caching, distribution, security, are these the highlights of your resume? Java fresh graduate, internship for more than half a year

Concurrency, message queue, load balancing, caching, distribution, security, are these the highlights of your resume? Java fresh graduate, internship for more than half a year

漂亮男人 2017-06-12 09:27:05 0  13  2047

Is storing delimited lists in database columns really that bad?

Imagine a web form with a set of checkboxes (any or all of them can be selected). I chose to save them in a comma separated list of values ​​stored in a column in the database table. Now, I know the correct solution is to create a second table and normalize the database correctly. It's faster to imp...

P粉020556231 2023-08-27 19:52:49 0  2  490

How to insert data from multiple nested lists into multiple rows in the database using a stored procedure

I have a MySql database table that looks like this: id|page_name|language|item_id|item_text This table stores the language based text used for various pages in a web application. I have translated text for multiple languages ​​and multiple pages, stored in a JSON file in the following format: [[&quo...

P粉807471604 2023-08-14 19:11:53 0  1  606

php - How to implement caching in ci3.0?

I want to implement database data in ci3.0. After I cached it according to the ci manual, the page effect is still average. Is there any better caching method?

曾经蜡笔没有小新 2017-07-05 10:46:03 0  1  864

codeigniter - PHP CI framework caching problem online etc.

CI goes to the database to query the results. If the cache is turned on in the configuration, it can be cached. However, it is cached in the form of files. If I use memcache to cache the results, is it unnecessary? There is another problem. The caching mechanism of CI itself is similar to memcache. ...

为情所困 2017-05-16 16:43:32 0  1  679

php - laravel uses cache to encrypt and verify the mac address before decrypting?

The version of laravel 5.1 I use uses Cache to cache data, and memcached and the database are used at the same time. But now there is a question. When laravel puts the data into the cache, it will encrypt the data at the same time. Among the encryption parameters, is the mac address of the machine? ...

大家讲道理 2017-07-07 10:34:27 0  1  964

Is it safe to store the verification in the session when doing SMS verification in php?

Is it safe to store the verification in the session when doing SMS verification in php? Where is the best place to store the session database cache?

欧阳克 2017-07-04 13:45:58 0  4  1032

java - Distributed transaction processing solution

Do you need distributed transactions when deploying hibernate on multiple web servers to operate the database? Will there be any problems using the traditional stand-alone method to access the database? How does the industry deal with this problem?

女神的闺蜜爱上我 2017-06-23 09:14:37 0  1  1239

How to solve the following problems

ORA-01589: must use RESETLOGS or NORESETLOGS option for database open. The ORACLE database virtual machine was cloned. The database was not closed during cloning. When the cloning was completed, an error occurred and the database was enabled and could not be started. Reason: The database stopped abn...

薛冬冬 2021-04-07 16:53:00 0  0  943

Open source PHP novice entry-level framework WillPHP (similar to ThinkPHP)

WillPHP is a lightweight development and learning MVC framework, an entry-level framework for PHP newbies (similar to ThinkPHP). ###Lightweight and extremely fast size 211KB (uncompressed), 22 initial files loaded (15 with page cache enabled), memory overhead <100KB. ###Main functions: automatic ...

P粉605904125 2022-07-23 16:30:16 0  0  793

Under what circumstances should cache be used? How to optimize the front and back ends (mini program page)

A product details interface, query data through product ID, and the front end mainly displays a picture. Database field pictue: the saved picture address, the picture is stored on the server. The problem now is that the pictures are loading too slowly, sometimes it takes a second to open, and someti...

小萝卜头 2020-05-16 18:32:29 0  3  1357

java - How to solve the pressure on scheduled task polling database

There are many scheduled tasks, and they are distributed on different servers. To poll the database for data that meets the conditions (status) and then process it. In this way, hundreds or thousands of scheduled tasks poll the database, which directly leads to a sharp increase in database pressure....

PHPz 2017-05-17 10:04:44 0  3  1238

Laravel5.1, two local projects A and B. Project A uses POST to communicate with project B, and ORM is used to query data in B. Is the database connection information for project A?

During the passing process, the DB_DATABASE printed in the log of project B is the database name of project A. The error reported by project B is: Base table or view not found: 1146 Table 'Project A's database.table name' doesn't exist What's going on? Both use the default file cache

某草草 2017-05-16 16:48:54 0  2  883

javascript - The api interface only takes 30ms to run locally, and it takes at least five or six seconds to put it online. What's going on?

I wrote an interface with a slightly larger computational load. The data is cached data stored using Thinkphp's f method. There is no access to the database. Why is the running speed only about 30ms during local testing, but it takes at least 5 seconds to put it on the server? Or so, why is this? If...

滿天的星座 2017-06-10 09:47:32 0  4  755

Can html replace string?

Website framework: flask background extracts data from the database and passes a parameter to the front end [172.16.101.31, 172.16.101.32, 172.16.101.33] After the front end obtains the parameters, it displays: But I need to display it in columns. The current modification method is, data When saving...

我想大声告诉你 2017-07-05 10:35:15 0  1  901

mysql - How to insert into the database after drag and drop reordering?

It is an article pagination, for example, ten pages, and the serial number is 1-10; one page stores a piece of data, but how do I sort it in the database after dragging it randomly?? The drag-and-drop modifications of each page are saved in the database in real time. I Now there are two ideas. One i...

某草草 2017-05-18 10:56:17 0  1  1135