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 ...
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 ...
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 ...
Oracle table size does not fix it constantly changes with DML operation. There is not only one query to check the table size in Oracle. Some factors change the actual ...
Oracle databases can have invalid indexes that are not usable. Such index unusable oracle state is UNUSABLE. Oracle DBA_INDEXES view returns all the indexes that are available in the database. ...