background: I want to add tagging capabilities for our products. A product can have multiple tags, and each tag can be used by multiple products, which is the so-called many-to-many relationship. specific: We have 10 million products Product, admi...
what databases are used by app with a very large amount of data, such as facebook, Weibo, Jinri Toutiao and so on? how to ensure access speed? ...
Table T_USER T_ROLE : the following is the table creation and data script drop table if exists T_USER; CREATE TABLE T_USER( USER_ID INT, USER_NAME VARCHAR(25) ); INSERT INTO T_USER VALUES(1, USER_A ); INSERT INTO T_USER VALUES(2, USER_B )...
2018-04-10T08:26:03.830775Z 0 [Note] usr sbin mysqld (mysqld 5.7.20) starting as process 9836 ... 2018-04-10T08:26:03.923709Z 0 [Note] InnoDB: PUNCH HOLE support available 2018-04-10T08:26:03.923741Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic b...
how do you design database fields like youtube pages that show whether you have pressed like or dislike? And go to the database to judge when the user arrives at the page? whether the design idea is like this Post table id picroute likeusers dislik...
designing a complete project includes not only the front-end project design, but also the need to build local servers and databases. As a front-end developer, what kind of database should you choose? There are a lot of people around who are using mongodb...
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as shown in the figure, a simple add and query operation takes up to 1 second [environment: windows + python3 + django2]. (the amount of data in PS: is not much, and todo_list has only 2 rows of data, which is still so slow.) def get(request): -...
as shown in the figure below, does SQLAlchemy have a simple way to directly declare that the specified field is not mapped serialized? for example, does java s Hibernate framework have such a function? (although there are other "indirect " solut...
there are 200000 data in the data, and each data has a typical list of words of 5000 length [{aVl1}, {bju 2},.], and typical dictionaries of 5000 length {{aRom 1}, {bjr 2},.}, use pyMongo to find100 data, the traversal of cursor is particularly slow, is...
in sql server database, an insert trigger is set for a table, and a new view is created in the trigger. How to design and write statements? Thank you ...
for example, the isolation level of transaction An is repeatable read my understanding is that a read sql statement of transaction An is the same as the result repeated many times, regardless of whether or not other transactions have changed the data ...
during the interview at Tencent the day before yesterday, I was asked a question: how do operators inject malicious content into their pages, or how to achieve the injection of advertisements such as "Big Emperor " that appear in the lower right corner ...
is there a big god to solve my next problem? the front and rear ends are separated from each other, and if you log in to the front end, you want to use cas to do the integration (login will jump to another page directly). The problem now is that the gene...
using velocity scroll animation in vue is not performed and there is no error prompt. let toElement = document.querySelector(target); let container = document.querySelector( body ); Velocity(toElement, scroll , { container: container, dur...
is using elementUI as the background. Use the component for uploading pictures. Click the plus sign to add the picture normally. But when the form needs to be re-edited, you need to show these pictures first, and the question is how to do it. ...
the Solr highlight range is incorrect, the range is expanded, and irrelevant content is highlighted. query parameters "params":{ "q":"licai_cpms:", "hl":"true", "hl.simple.post&...