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mysql - Why does database read-write separation improve database performance?

Please see the blog above for why read-write separation can improve database performance. According to database common sense, read-write separation can indeed improve database performance, but you don't know if you understand its underlying principles. For example, one reads and one writes, but the ...

PHPz 2017-05-24 11:34:46

TypeError in Next.js: Cannot read property of undefined (reading 'headers')

I'm getting this error in next js TypeError: Cannot read property of undefined (read 'headers') in eval(webpack-internal:///(sc_server)/./node_modules/next/dist/server /future/route-modules/app-route/module.js:254:61) Code snippet example: newUser.save().then(()=>NextRespons

P粉146080556 2023-10-27 10:05:19

Firebase React Hook Error: Cannot read property of undefined (reading '_repo')

I'm writing a hook to get the userole from the live database in next js and I'm getting the error "Cannot read property of undefined (reading '_repo')". This is what my hook looks like import{useEffect,useState}from"react";import{useRouter}from"next/router";import{onAut...

P粉436688931 2024-03-20 12:15:03

TypeError: Cannot read property of undefined on Next.js (reading 'current')

TypeError: Cannot read property of undefined (reading 'current') I get this error the first time I run a nextjs project. This is the command I'm running: npxcreate-next-app@latestmy-test-app--typescript--tailwind--eslint This is what my package.json looks like: {"name";"my-test-app&qu...

P粉714890053 2023-09-14 13:15:42

TypeError: Cannot read property of null (read 'length'). What does it mean?

I have a problem that I'm trying to solve. Cannot read property of null (read 'conversion'). What does it mean? . I checked the options for integrating mychart.update() from this issue https://github.com/chartjs/Chart.js/issues/5149. But when I try to start I get other errors. TypeError:Cannotreadpr...

P粉031492081 2023-11-04 11:52:35

Vue js: Troubleshooting - Reading '$refs' property of undefined

Getting the error Cannot read property of undefined (reading '$refs') even though I have a reference in the template. Does this mean I have to use Vue mount hooks? <divclass="input-wrapper"><inputtype="text"id="phone"placeholder="(555)555-5555"ref=&qu...

P粉848442185 2023-11-07 23:34:12

The title can be rewritten as: In a server-side application (like PHP, Ruby, Python, etc.), is it possible to read the hashed part of a URL?

Assume that the URL is: www.example.com/?val=1#part2PHP can use the GET array to read the request variable val1. Is the hash value part2 also readable? Or can it only be handled by the browser and JavaScript?

P粉145543872 2023-08-20 20:10:37

Access and read values and properties in XML files in Laravel or PHP

I have an XML file with this structure and I want to read it from Laravel, for this I use SimpleXMLElement. I can access the "id" and "color" attributes but I don't know how to access the value, in this case the example is the "Porsche or Ferrari" XML file <?xmlversi...

P粉012875927 2023-12-15 11:54:24

mysql_replication - What to do if a single writing database cannot meet the performance requirements when mysql reads and writes are separated?

When mysql reads and writes are separated, what should I do if a single writing database cannot meet the performance? Should I use multiple databases to write? So how to synchronize data and ensure data consistency?

学习ing 2017-06-20 10:05:42

Cannot read property of undefined error: Wrong class binding type for Vue bound object property

I'm trying to bind a class based on an object property, but when I click on the list object to trigger the @click, the console tells me that the object property of isSelected cannot be read... I'm trying to use a function on a dynamically rendered list item to Receives the id of the item and trigger...

P粉617237727 2023-08-26 23:55:21

Nested collapsible visibility issue

`Whenever I expand a nested collapsible, the visibility of its parent is not calculated correctly. Some nested content is missing from the screen This is the html code and js code that handles the scroll height //Getallcollapsiblebuttonsconstcollapsibles=document.getElementsByClassName('collapsible'...

P粉805922437 2024-02-21 19:54:34

TypeError: Cannot read property 'type' of null - Testing vue components using async functions

I'm testing the component ComponentA.spec.js and I'm getting TypeError: Cannotreadproperty 'type' of null. If I remove the wait keyword in the getData() function in ComponentA, it works. I mocked the getDataapi call in my test but it still doesn't work. Here is the full stack TypeError: C:[Privacy]\...

P粉818306280 2023-08-28 23:34:29

Why can I use both the start attribute and the reversed attribute in the OL tag?

Why can I use both the start attribute and the reversed attribute in the OL tag?

自渡 2018-07-04 14:25:24

Static properties can be called in non-static methods

As mentioned at 3:30 in this lesson, static attributes cannot be called in non-static methods. However, according to personal testing, non-static methods in this class can call static attributes using [self::attribute name of static attributes]. Can

God_Like 2019-04-14 19:20:19

How to make all properties in Zod schema optional based on specific product availability flag?

I have a Zod schema for validating product attributes for an e-commerce application. In my schema I currently have a property called isLimitedEdition which indicates whether the product is in limited supply. However, when isLimitedEdition is set to true, I want all other properties in the schema to ...

P粉298305266 2023-08-30 22:37:05

Can the HTML title attribute be edited?

Is it possible to edit/set the HTMLtitle (works like a tooltip) attribute using CSS for <h2title="SiteOwner">Mr.Mark</h2> as shown above? I tried styling it with inline CSS but it didn't go through.

P粉277305212 2024-02-25 23:52:19