I'm working on an express.js project, using Sequelize as the orm, and postgres as the engine. I'm working on improving the performance of a slow select query that does many things, and one of them is comparing the acronym of…
When the query does not meet the conditions for index coverage,if Innodb will use index condition pushdown by auto? or how to explain these two thing by simple word or example.
I have a log table with timestamped (DATETIME) rows in the millions which I occasionally need to search by date or date range. I have an index on the timestamp column at present for the purpose. However, I am wondering…
I have 3 tables. country, team, player table Country id name 1 x 2 x 3 x table Team id name country_id 1 x 1 2 x 1 3 x 1 table Player id name country_id team_id 1 x 1…
I have a database table that having close to 100 columns - 25 columns are STRING, the rest is INT/DECIMAL/BOOL. This is the query that I am trying to run - the query is generated based on the search criteria…
CREATE TABLE `test` ( `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT, `month` timestamp NOT NULL DEFAULT '2018-01-01 00:00:00', `b` varchar(255) NOT NULL DEFAULT '', `c` varchar(255) NOT NULL DEFAULT '', `d` varchar(255) NOT NULL DEFAULT '', `e` varchar(255) NOT NULL DEFAULT…
I have a query like select C.customerId, C.firstName, C.LastName, R.IsActive from Customer as C Inner join Rider as R ON R.customerId = C.customerid where R.rideid = 'xyz' and R.rideareacode = 'abc' and R.isActive = 1 This is taking too much…
I have a PostgreSQL table named users which contains between 20 to 30 million records. The table has the following columns: id, tenant_id, name, company, location, and description. I need to perform generic search queries on this table with various…
we load angular component on scroll for better page performance but these component content not crawled by google bot. we have implemented angular ssr & prerendering. we are using scroll event @HostListener('window:scroll', ['$event'])
I need to index a Postgres column that consists of mostly NULL values. I don't want the NULL values to be stored in the index (to make the index smaller, and to speed up row insertion). However, adding a partial…