Application takes huge amount of ram

[Thank You]

@JoeCFD and @jsulm
There are many leaks in core dll than my application.
I used deleaker for this to find
What can I do for it??

Does it mean there are leaks in core dll too??

[JoeCFD]

If that is the case, simply select another version of Qt. I am not aware of Qt-5.12.8 has so many problems, especially in Qt5Core. Hard to imagine this.

If you have the same problem with another version of Qt(for example 5.15.2), it is likely your code(not Qt) has problem.

[artwaw]

@Thank-You There is something fishy about either this tool (first time I see it) or your code. I write tools that use SQLite for everything, users leave those tools running for days sometimes and no extensive memory use have ever been detected. And we are talking about shitty windows budget office machines here.
I'd like to see the code before I'll decide that Qt libraries have issues with memory leaks on that scale.

EDIT:
I started to google and found this post: https://www.francescmm.com/deleaker-review-on-gitqlient/
Author also found leaks in Qt libraries and states:

This scared me a lot, because I wasn’t expecting to get so many leaks to start with. But I was wrong: when I took the snapshots, the objects are attached to the life of their parent widget. So, for now I don’t need to worry!

[Thank You]

@artwaw I used Deleaker sir.
Followed official documentation to do my work but it just show this
On my application it says leaking in just 5 files and with very low allocation size whereas it shows huge allocation in QtLibraries
I have used SQLITE for fetching data in every page again it inserts data from all pages and keep tracks of every transaction.

This is updated code that I use
I have promoted widgets in stacked widgets

Just updated version of upper codes

#ifndef MAINWIN_H
#define MAINWIN_H

#include <QMainWindow>
#pragma once
#include<database.h>
#include<quitdialog.h>






QT_BEGIN_NAMESPACE
namespace Ui { class mainwin; }
QT_END_NAMESPACE

class mainwin : public QMainWindow
{
    Q_OBJECT

public:
    mainwin(QWidget *parent = nullptr);
    ~mainwin();
    void connections();
    void closeEvent(QCloseEvent *event);
    database d;
     QString databaseName = d.getDatabaseName();


private slots:
    void logout_button_clicked_slot();
    void new_shipment_button_clicked_slot();
    void confirmation_button_clicked_slot();
    void account_button_clicked_slot();
    void more_button_clicked_slot();
    void dashboard_button_clicked_slot();
    void settings_button_clicked_slot();
    void report_button_clicked_slot();
    void advanced_button_clicked_slot();
    void ham_burger_button_clicked_slot();
    void messages_button_clicked_slot();
    void quit_button_clicked_slot();
    void on_menuDocumentation_triggered();

private:
    Ui::mainwin *ui;
     bool hamClicked;
     bool closeApp;

};
#endif // MAINWIN_H

I remove all the pointers from here but there is no any gain in performance and is allocating same amount of memory

Below file is mainwin.cpp

#include "mainwin.h"
#include "ui_mainwin.h"

mainwin::mainwin(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::mainwin)
{
    ui->setupUi(this);
    ui->mainApp->setCurrentIndex(0);
    connections();
    hamClicked = true;
    ui->nav->setMinimumWidth(200);
    ui->nav->setMaximumWidth(200);

}

mainwin::~mainwin()
{
    delete ui;
}
void mainwin::connections(){
    navigation *nav_bar = ui->navigationBar;
    login *log = ui->loginPage;

    connect(log,SIGNAL(login_button_clicked_signal(QString , QString, QString)),nav_bar,SLOT(login_button_clicked_slot(QString,QString,QString)));
    connect(nav_bar,SIGNAL(logout_button_clicked_signal()),this,SLOT(logout_button_clicked_slot()));
    connect(nav_bar,SIGNAL(new_shipment_button_clicked_signal()),this,SLOT(new_shipment_button_clicked_slot()));
    connect(nav_bar,SIGNAL(confirmation_button_clicked_signal()),this,SLOT(confirmation_button_clicked_slot()));
    connect(nav_bar,SIGNAL(account_button_clicked_signal()),this,SLOT(account_button_clicked_slot()));
    connect(nav_bar,SIGNAL(more_button_clicked_signal()),this,SLOT(more_button_clicked_slot()));
    connect(nav_bar,SIGNAL(dashboard_button_clicked_signal()),this,SLOT(dashboard_button_clicked_slot()));
    connect(nav_bar,SIGNAL(settings_button_clicked_signal()),this,SLOT(settings_button_clicked_slot()));
    connect(nav_bar,SIGNAL(report_button_clicked_signal()),this,SLOT(report_button_clicked_slot()));
    connect(nav_bar,SIGNAL(advanced_button_clicked_signal()),this,SLOT(advanced_button_clicked_slot()));
    connect(log,SIGNAL(login_button_clicked_signal(QString , QString, QString)),ui->settings,SLOT(login_button_clicked_slot(QString,QString,QString)));
    connect(log,SIGNAL(login_button_clicked_signal(QString , QString, QString)),ui->messages,SLOT(login_button_clicked_slot(QString,QString,QString)));
    connect(nav_bar,SIGNAL(ham_burger_button_clicked_signal()),this,SLOT(ham_burger_button_clicked_slot()));
    connect(nav_bar,SIGNAL(messages_button_clicked_signal()),this,SLOT(messages_button_clicked_slot()));
    connect(log,SIGNAL(login_button_clicked_signal(QString , QString, QString)),ui->newShipment,SLOT(login_button_clicked_slot(QString,QString,QString)));


}

void mainwin::logout_button_clicked_slot()
{
    // it is default page
    ui->mainApp->setCurrentIndex(0);
}

void mainwin::new_shipment_button_clicked_slot()
{
    ui->newShipment->clearValues();
    ui->newShipment->mainFunction();
    ui->mainApp->setCurrentWidget(ui->newShipment);

}

void mainwin::confirmation_button_clicked_slot()
{

    ui->mainApp->setCurrentWidget(ui->confirmation);
}

void mainwin::account_button_clicked_slot()
{

    ui->account->mainFunction();

    ui->mainApp->setCurrentWidget(ui->account);

}

void mainwin::more_button_clicked_slot()
{

    ui->mainApp->setCurrentWidget(ui->moreThings);

}

void mainwin::dashboard_button_clicked_slot()
{
    ui->dashboard->mainFunction();
    ui->mainApp->setCurrentWidget(ui->dashboard);


}

void mainwin::settings_button_clicked_slot()
{
    ui->dashboard->mainFunction();
    ui->mainApp->setCurrentWidget(ui->settings);

}

void mainwin::report_button_clicked_slot()
{
    ui->report->mainFunction();
    ui->mainApp->setCurrentWidget(ui->report);

}

void mainwin::advanced_button_clicked_slot()
{
    ui->mainApp->setCurrentWidget(ui->fullSettings);
}

void mainwin::messages_button_clicked_slot()
{

    ui->mainApp->setCurrentWidget(ui->messages);

}

void mainwin::ham_burger_button_clicked_slot()
{
    if(hamClicked){
        ui->nav->setMaximumWidth(60);
        ui->nav->setMinimumWidth(60);
        hamClicked = false;
    }else{
        ui->nav->setMinimumWidth(200);
        ui->nav->setMaximumWidth(200);
        hamClicked = true;
    }

}

void mainwin::quit_button_clicked_slot()
{
    closeApp = true;
    QCoreApplication::quit();
}

void mainwin::closeEvent (QCloseEvent *event)
{
    quitdialog closeApplication;
    connect(&closeApplication,SIGNAL(quit_button_clicked_signal()),this,SLOT(quit_button_clicked_slot()));
    event->accept();
  
}

In the main entrypoint of application I have just inserted css files using textstream from resources files
database.h contains all headers included
That's it
What may be the cause of it ?
EDIT:
In addition to it when I add dialog at the closeEvent then it reports
Insufficient Memory case 4

[Thank You]

@SGaist and @JonB sir,
Can you see this?

[SGaist]

Unused stuff can get optimized out by the compiler hence no memory allocated.

Without any information about what the reports give you it's hard to answer.

Note that detectors might find false positives. For example Valgrind needs suppression files to remove some stuff that it detects as errors which are in fact not.

[Thank You]

@SGaist
But if I leave the application for about 5 minutes ,
it just takes 120 - 160mb or less than that of ram .
What may be the reason

[SGaist]

Profile your application to see what eats memory.

@Thank-You said in Application takes huge amount of ram:

database d;

That thing here we know nothing about so it might be as well it that is leaking memory depending on how you use it and what it does.

[Thank You]

@SGaist

#ifndef DATABASE_H
#define DATABASE_H

#pragma once
#include<QString>
#include<QFile>
#include<QMessageBox>
#include<QDebug>
#include<ctime>
#include<QTextStream>
#include<errorsexpress.h>
#include<QSql>
#include<QtSql/QSql>
#include<QtSql/QSqlDatabase>
#include<QtSql/QSqlQuery>
#include<QtSql/QSqlDriver>
#include<QtSql/QSqlQuery>
#include<QtSql/QSqlQueryModel>
#include<QSqlError>

class database
{

public:
    database();
    QString readTextFile(QString path);
    QString getDatabaseName();

    QString getUsername();
    QString getId();
    QString getPost();

    void saveRequest(QString user_id ,QString special_value, QString operation,QString page);
    ErrorsExpress ERRORS;

};

#endif // DATABASE_H

database.cpp implements just these functions straight forward. Contains all headers that are needed in every other files
It is included in every files.
Please say something on these
But if I leave the application for about 5 minutes ,
it just takes 120 - 160mb or less than that of ram .
What may be the reason

[SGaist]

Since you have a database, what are you loading from it ?

[Thank You]

@SGaist
It's like CRUD application but it saves every transaction,
It has 8 tables
It shows all inserted data, prepare simple report in tableView.
There are almost 50 queries within the program

[SGaist]

How many transaction are we looking at ?
How are you storing them ?

[Thank You]

@SGaist
FIXED BUT
I have 9 tables with max 28 columns and min of 8 columns.
On every database query I am using saving type of query(like on every transaction)
Sir problem is solved now. I uninstalled and installed the Qt(same offline installer). It is using just 200-300mb ram on average and it's not that problem. I don't know the reason but problem is fixed. The problem is fixed but do you have any idea , why this happened?