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What is VERBOSE, and How to Use it With the ANALYZE Command? By default, ANALYZE command does not display any processing on the screen. However, if the VERBOSE option is used with the ANALYZE command, then the output will be in a more detailed format.

ANALYZE TABLE causes Oracle to determine how many rows are in the table and how storage is allocated. It also calculates the number of chained rows. The most important pieces of information the optimizer gets from this process are the number of rows and the number of blocks.

Under normal circumstances you don't need to analyse the table, the index cares for himself, it updates the index and stats automatically. But on high traffic tables, with lots of deletes the index gets "confused" and needs more time to select the right rows, then you run ANALYSE when no other traffic is made.

OPTIMIZE TABLE Analyzes table, stores the key distribution for a table, reclaims the unused space and defragments the data file. ANALYZE TABLE Only analyzes table and stores the key distribution.

Start by converting your data in several ways, like plotting it on a graph, examining the correlations, or creating a pivot table in your Excel. What is a pivot table? This table enables you to sort and filter data over different variables to calculate your mean, minimum, maximum, and standard deviation of that data.

ANALYZE TABLE removes the table from the table definition cache, which requires a flush lock. If there are long running statements or transactions still using the table, subsequent statements and transactions must wait for those operations to finish before the flush lock is released.

The way analyze table helps performance is that it updates statistics that the optimizer uses to choose indexes for a given query.