If you have a table or multiple tables with hierarchical data then use Oracle SQL connect by to select complete structing using a single query. This is a big benefit ...
Oracle plan_table contains detailed information about the execution plan. It is a temporary table that holds the output of the query plan. Oracle plan_table is created to describe different types ...
This is one of the table join mechanisms in Oracle. There are three types of joining methods including nested loop join in Oracle. Below are those types that merge two ...
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 ...
Explain plan in Oracle is the sequence of operations for a statement that is chosen by the Oracle optimizer. This is the flow of execution of a statement. The execution ...
Before explaining Oracle table access by index rowid, I would like to explain a bit about what is rowid and how it is used in the Oracle database. The table ...
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 ...
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 ...
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