How does expdp evaluate the data size when exporting?

This article introduces the relevant knowledge of "how to evaluate the data size when expdp is exported". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Expdp evaluates the size when exporting data. The evaluation here is done in two ways. By default, block is used to calculate the size of the file system. Through estimation, we can well evaluate the calculation of the size of the file system, which is convenient for planning and use.

The first step is to create a directory path. Here are just some examples.

Create or replace directory dir_dump as'/ oracle/dump'

Grant read,write on directory dir_dump to public

Grant read,write on directory dir_dump to user

Select * from dba_directories

Evaluate Siz

Expdp needs to calculate the size and capacity of the exported data, and there are two ESTIMATE_ONLY ways to estimate the size of the parameters.

1. Estimate by block size. Default

Expdp\'/ as sysdba\ 'ESTIMATE_ONLY=y schemas=user ESTIMATE=blocks

2. Estimate through statistical information

Expdp\'/ as sysdba\ 'ESTIMATE_ONLY=y schemas=user ESTIMATE=statistics

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