I am inserting data from the tmp_details table into the details table using an INSERT query in chunks. I am also modifying the data while inserting it. The query is taking a lot of time to execute. My read IOPS…
I have a large CSV file that I need to update into a PostgreSQL database. I am considering two different approaches and would like to know which one is faster for updating very large data. Here are the two approaches:…
I am creating a script that draws an ASCII picture. I need to separate each individual character in a tag, though the page gets too laggy and the CPU usage goes up by an extreme amount when executing the loop,…
I have a SQL query that fetches one row (LIMIT 1) for a specific client code from the TABLEA based on several conditions. Here's the query: SELECT `TABLEA`.`client_code` FROM `TABLEA` WHERE ( `TABLEA`.`accounting_date` = 202408 AND ( `TABLEA`.`FLAG1` = ''…
This query is taking more than 90 seconds UPDATE `tableA` SET `bill_no` = NULL WHERE `tableA`.`payment_no` = 'S00005303'; how to find the cause of slowness I checked show processlist; and there are no other queries running at the same time.
So if I understand correctly we can choose a binary format (protobuf, thrift or avro) when we want better performance as the data are represented in a more compact way and we don't have the extra overhead of JSON/XML parsing…
The following method functions fine but I am curious as to performance and optimization. Example I call 'Output(str)' to send something to the terminal. I added a method that only outputs if debugging, as follows. Now I am left wondering…
I have two images of different sizes that I want to composite together using a CIFilter. ImageA size is 2400x1800. ImageB size is 1200x900. As the two images are different sizes, when the images are composited together, ImageB is positioned…
I’m working on a React application, and I have a component that renders a list of items. I’ve noticed that as the list grows, the component’s performance degrades. Here’s the code for the component import React, { useState, useEffect }…
Is there any difference in terms of performance between if (variable == null) ... and if (variable case null) ... How compiler handles this? Does case work more like const? Also, what about case vs is?