Oracle Uses this merging mechanism to merge large datasets. Hash Join in Oracle is effective when a dataset is fit to the memory. Optimizers choose this joining method when two ...
What is Full Table Scan in Oracle? Simply it reads all the rows in the table. If you have a Where condition, then filter records according to that. Normally oracle ...
An Oracle index full scan is Oracle start read block from ROOT and then navigating to the down branch until find the leaf block on the left side. Move to ...
If the table has primary keys then you can scan through the unique index. oracle index unique scan stops the scanning process once the first record is found. A unique ...
Oracle quickly fetches data by using an Index. There are different scan methods including Oracle index skip scan. If you have a composite index in the table, then this is ...
A database can scan only using the index to perform database operation without acessingTable in Oracle index fast full scan. This is scanning without any order. Indexes are performed when ...
Oracle offers a variety of indexing methods. index range scan oracle is one of the index scanning methods to gather ROWIDs and retrieve data from the table. There are a lot ...
Oracle SQL cascade delete is You have a Relation between tables then the Parent table record is deleted then referring child table records will be deleted. This is similar to ...
In SQL there are several ways to SQL check if at least one row exists in the table. I hope to list everything. Performance can change according to the pattern ...
Getting better performance depends on different conditions. But performance tuning in Oracle is one major condition. Hardware problems, Network problems, Configuration problems, and bad Coding problems also hit the performance ...