My AWS dynamoDB has id as Partition key and there is no Sort key. The following does not return the existing record from the table: response['Scann ...
My AWS dynamoDB has id as Partition key and there is no Sort key. The following does not return the existing record from the table: response['Scann ...
I have just started exploring execution plans in SQL and I am not able to figure out how the query optimizer decides when to do a full table scan or i ...
I have many-to-many relationship between User and Poll. While creating the relating class below I'm getting this warning on compile time: warning: Th ...
I have really big table (over 10 million rows) and query which returns a lot of data. I need to make it to run faster. So I tried to add covering inde ...
I've been googling back and forth for this, and could not get a grasp of how are the table data blocks structured on the disk. Many resources state t ...
in short: we are facing a problem that full table scan is performed on remote Oracle DB instead of using the index. Setup: Postgres 12.3 in an enric ...
I have a same query running on two different DB servers with almost identical config. Query is doing Full Table scan(FTS) on one table SELECT COUNT ...
There are two tables, Costs and Logs. The data in Costs table can be in the millions of rows, and in Logs table it can be billions of rows. I need to ...
In attempting to pull a large series of columns (~15-20) from several joined tables, I put together 2 views that would pull the necessary information. ...
On SQL Server 2017(RTM-CU17) with query optimizer hot fixes on I have an indexed view that is taking a considerable amount of time to update. I am at ...
Using postgres 9.6.11, I have a schema like: owner: animal: In some example data: owner table: animal table: A common query I need to pe ...
This is a general question about the Oracle MERGE INTO statement with a particular scenario, on Oracle RDBMS 12c. Daily data will be loaded to Stagin ...
Brief: Is there any way to improve the performance of table scans on InnoDB tables? Please, do not suggest adding indexes to avoid table scans. (see ...
select *from REPT_AIR_PRY_HY1 RAP where (RAP.DATE_OF_ISSUE) BETWEEN "2017-10-01" AND DATE_ADD("2017-10-31", INTERVAL 1 DAY) the explain plan of this ...
we have a little problem with one of our queries, which is executed inside a .Net (4.5) application via System.Data.SqlClient.SqlCommand. The problem ...
I have the following MySql table (only 845 rows): (you can see I have a whole lot of indexes in there, just in case). I perform the following self ...
I’m using MySQL 5.5.37. It is not an option to upgrade at this time. I have this table Notice the indexes on the ACCESS_CODE_ID and TEACHER_ACCESS_ ...
I would appreciate help from anyone familiar with how DynamoDB work. I need to perform scan on a large DynamoDB table. I know that DynamoDBClient scan ...
I have a table with large amount of data(Say 1,000,000,000 rows). Table Structure: I have omitted other fields from the table as I cannot use any ...
This is a simple question. Suppose I have a massive table (5 million rows), and I have no option but to do a full table scan. Is there any way at ...