I'd like to do something similar to what's described in http://www.bestbrains.dk/Blog/2010/03/25/HowToAssertThatYourSQLDoesNotDoFullTableScans.aspx but for that I'd need postgres to keep track of a...

First: I know isn't a good idea do a full scan in Cassandra, however, at moment, is that what I need. When I started look for do someting like this I read people saying wasn't possible do a full s...

Using postgres 9.6.11, I have a schema like: owner: id: BIGINT (PK) dog_id: BIGINT NOT NULL (FK) cat_id: BIGINT NULL (FK) index DOG_ID_IDX (dog_id) index CAT_ID_IDX (cat_id) animal: id: BIGIN...

I am going through documentation of MySql Indexes Optimization. I found a setting --max-seeks-for-key=1000.I checked the "server system variables" of MySQL here. According to it "By setting thi...

As I know, heap tables are tables without clustered index and has no physical order. I have a heap table "scan" with 120k rows and I am using this select: SELECT id FROM scan If I create a non-...

I'm trying to find documents where a field starts with a value. Table scans are disabled using notablescan. This works: db.articles.find({"url" : { $regex : /^http/ }}) This doesn't: db.artic...

Everyone warns not to query against anything other than RowKey or PartitionKey in Azure Table Storage (ATS), lest you be forced to table scan. For a while, this has paralyzed me into trying to come...