In my laravel project I am currently doing some testing with database seeders to check the performance with many database entries. In my project I have a Model FlightView using a SQL view as database by doing protected $table =…
Edit: EXPLAIN result for the first two queries when using src_cus_lang: EXPLAIN result for the last two queries when using cust_lang_src: Original post: I'm using MySQL and have a table as follows: CREATE TABLE tm( id INT AUTO_INCREMENT PRIMARY KEY,…
In the shared plan index scan cost is very high (cost=0.56..696715.50 But Limit (cost=0.56..224.59 is very low and so on result cost Result (cost=224.59..224.60 rows=1 width=8) why it is so? Right now I will consider this query harmless as it…
can someone help me make it simple and fast? select k1.sto, k1.mm,k1.dd, k1.yy, k1.sto_name, k1.trannum, count(k2.barcode) from trans012020 as k1 , trans012020 as k2 where k1.barcode=123456789 and k1.mm=k2.mm and k1.dd=k2.dd and k1.yy=k2.yy and k1.sto=k2.sto and k1.trannum=k2.trannum group by k1.trannum having…
The routed_way table has a column named way where the path of a vehicle is stored. The length of these paths can vary greatly, with some being short and others containing millions of points. Although the table only has thousands…
I am curious what techniques Database Developers and Architects use to create dynamic filter data response Stored Procedures (or Functions) for large-scale databases. For example, let's take a database with millions of people in it, and we want to provide…
I have three database tables: product product_manufacturer product_manufacturer_warranties. The product table has a one-to-one mapping with product_manufacturer and the product_id is stored in the product_manufacturer table. The product_manufactuer table has a one-to-many mapping with the product_manufacturer_warranties table. I need to…
A table (phototag) consists of two foreign key columns (photoid, tagid). I want to get the most related photos based on their tags. There are 4 million photos with 5-10 tags. For example, the photoid 10009 has 6 tags. I…
Consider we have A,B,C,D,E,F,G,H columns in my table and if I make composite indexing on column ABCDE because these column are coming in where clause and then I want composite indexing on ABCEF then I create new composite indexing on…
I have a ledger-like table in a postgresql DB that tracks events for film comparisons on a site where users can add/remove film comparisons. Each event is recorded as a timestamped row in the event database. Rows are never removed:…