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oracle database running sql method
The steps to run sql include: opening the sql plus tool and connecting to the database. Enter the sql statement at the prompt. Press the enter key to run the statement. View results, error messages or exit SQL Plus. If you want to know more about Oracle database, you can read the articles below this topic.
How to back up data in oracle databaseOracle database provides multiple methods to back up data: RMAN backup: use Recovery Manager (RMAN) for complete backup and recovery; EXP/IMP export and import: export and import data, suitable for small to medium-sized databases; database replication: create a database copy , keep the copy synchronized with the source database to ensure high availability; data pump export and import: backup and recovery are fast, but the functionality may be limited; logical backup: create data structure and text representation of the data.
How to open oracle databaseThe method to open the Oracle database is: first turn on the mount mode, which will start the instance, load the database and save the database's shutdown mode; then turn on the open mode, start the instance, load and open the database; finally turn on the force mode, terminate the instance and restart the database (open).
How to modify fields in oracle databaseIn Oracle, you can use the "ALTER TABLE MODIFY" statement to modify fields. The syntax is "ALTER TABLE table name MODIFY field name operations to be performed;"; common operations include: modifying the visibility of a column, changing the default value of a column, modifying Expressions for virtual columns, etc.
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