How Does Oracle extract DDL statements from dump files?

Commands for the export ledump File Include expimp and expdpimpdp. For dump files, we cannot extract data directly, but we can

Commands of the Oracle dump File Include exp/imp and expdp/impdp. For dump files, we cannot extract data directly, but we can

Commands of the Oracle dump File Include exp/imp and expdp/impdp. For dump files, we cannot extract data directly, but we can extract the corresponding DDL statements from the dump file through relevant parameters.

Description of how Oracle extracts DDL statements from the Dump file

If it is an Export Import (exp/imp), it is the indexfile parameter;

If it is a data pump (expdp/impdp), it is the sqlfile parameter.

The DDL statements extracted by expdp/impdp are more detailed and more readable.

1. Use the exp/imp command

1. Export lxh user data and generate a dump file

Exp lxh/lxh file = lxh. dmp owner = lxh

2. Extract DDL statements from the dump file

Imp lxh/lxh file = lxh. dmp fromuser = lxh touser = lxh indexfile = lxh. SQL

The import command does not actually import data, but only generates all the DDL SQL statements for the corresponding user. The DDL statements of the table are annotated with REM.

Ii. Use the expdp/impdp command

1. Export lxh user data and generate a dump file

Expdp lxh/lxh directory = backup dumpfile = lxh. dmp schemas = lxh

2. Extract DDL statements from the dump file

Impdp lxh/lxh directory = backup dumpfile = lxh. dmp sqlfile = lxh. SQL

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