postgresql – Performance of indexing varchar or text as an alternative to UUIDs?

I was reading up on nanoid and was possibly considering using the generated ids as the primary key for a table. The generated IDs are strings such as V1StGXR8_Z5jdHi6B-myT.

In my research I came across the following comment:

One of the benefits at least in postgres is that uuid v4 can be treated like a native type when stored which makes it fast to search.

Is it necessarily true that a primary key based on a UUID column would be more performant than a primary key based on a text or varchar column? If so, is there some other data type I can use to store nanoids which would match the performance of the native UUID type?

group policy – Windows Search Indexing Locations: GPOs don’t apply when setting via registry

If I enable of the following templates via gpedit.msc, they apply correctly:

Computer ConfigurationAdministrative TemplatesWindows ComponentsSearch
 Default excluded paths
 Default indexed paths
 Prevent indexing certain paths

However when setting the corresponding registry keys, they are ignored completely (even after a reboot), except if I apply one of these later manually. It seems the WSearch service (SearchIndexer.exe) doesn’t read the policies until some function triggers it to.

For example, let’s say I want to exclude C:Users, with this batch script:

net stop WSearch && sc config WSearch start= disabled
reg add "HKLMSOFTWAREPoliciesMicrosoftWindowsWindows SearchDefaultExcludedPaths" /v "%SYSTEMDRIVE%Users" /t REG_SZ /d "%SYSTEMDRIVE%Users" /f
reg add "HKLMSOFTWAREMicrosoftWindows SearchCurrentPoliciesDefaultExcludedPaths" /v "%SYSTEMDRIVE%Users" /t REG_SZ /d "%SYSTEMDRIVE%Users" /f
sc config WSearch start= demand && net start WSearch

It doesn’t get applied unless, let’s say, I add another directory to Default indexed paths via the Group Policy Editor.

I have successfully removed this rule by deleting the corresponding key in HKLMSOFTWAREMicrosoftWindows SearchCrawlScopeManagerWindowsSystemIndexWorkingSetRules but it’s a bit messy because you have to edit permissions and such. This would be a cleaner, more standard way of achieving the same.

Some confusion about indexing

HI,
I recently purchased GSA SER EN software. I had a GSA SEO indexer. I started a project in GSA SER EN with the option of indexing with GSA SEO Indexer. But unfortunately I found that it does not send automatically, I have to press the button "Test". After pressing the test button ONLY 10 links are sent to my GSA SEO indexer, while my GSA SER EN indicates that 970 dofollow links have already been created.
So I tried to configure the Elite indexer with the correct API key, but it doesn't send a link automatically either. I have to press the "test" button and after that only 10 links are sent to the elite indexer.
Very confusing. Could you please show me how I can correct this? I may be configuring something wrong.

c ++ – Access to members of base classes in the derived class through runtime indexing

Consider the following code

#include 
#include 

template  struct base {
    std::size_t value;
};

struct derived: base<0>, base<1> {
    using pointer_type = std::size_t derived::*;
    using array_type = std::array;
    static constexpr array_type members{{&base<0>::value, &base<1>::value}};
    constexpr std::size_t& operator()(std::size_t i) noexcept {
        return this->*(members(i));
    }
    constexpr const std::size_t& operator()(std::size_t i) const noexcept {
        return this->*(members(i));
    }
};

int main(int, char**) {
    derived x{42, 84};
    std::cout << sizeof(base<0>) + sizeof(base<1>) << " " << sizeof(derived);
    std::cout << std::endl;
    std::cout << x(0) << " " << x(1);
    std::cout << std::endl;
    return 0;
}

A template structure is created base with a data element valueand a structure derived that inherits from several specializations of it. I want to access them value one or the other base class depending on an index provided at runtime. The code provided does not seem to achieve this and always returns that value of the first base.

I want to achieve it:

  • Without changing the code from base
  • Without changing the way derived inherits from the base
  • Without changing that sizeof(derived) (Tricks should be constexpr/static)
  • Only with defined behavior (no undefined behavior reinterpret_cast for example)

In other words, the layout of the code I don't want to change should be:

#include 
#include 

template  struct base {
    std::size_t value;
};

struct derived: base<0>, base<1> {
    /*  things can be added here */
    constexpr std::size_t& operator()(std::size_t i) noexcept {
        /*  things can be added here */
    }
    constexpr const std::size_t& operator()(std::size_t i) const noexcept {
        /*  things can be added here */
    }
};

int main(int, char**) {
    derived x{42, 84};
    std::cout << sizeof(base<0>) + sizeof(base<1>) << " " << sizeof(derived);
    std::cout << std::endl;
    std::cout << x(0) << " " << x(1);
    std::cout << std::endl;
    return 0;
}

Why isn't the current trick working and is there any way to get it to work?

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macos – Disables indexing in XCode only for a specific project

Is it possible to disable indexing in XCode for a particular project instead of completely disabling it? I found ways to disable it completely, but I only want to disable it for individual projects. The reason why I'm trying to do this is because one of the XCode projects I have on my computer – Chromium is too big and it takes ages to be indexed. This can be done in Visual Studio. We can even disable individual projects in VS to disable indexing for specific projects. Looks like we can't do that in XCode either. But it wasn't googled.

Thanks a lot

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