How to export table data from oracle database
Jun 04, 2025 pm 09:51 PMExport table data from an Oracle database using Data Pump, SQLPlus, and Oracle SQL Developer. 1. Data Pump: Use the command expdp system/manager DIRECTORY=data_pump_dir TABLES=your_table_name DUMPFILE=your_table_name.dmp LOGFILE=export_log.log to increase the speed through the PARALLEL parameter. 2. SQLPlus: Export to CSV file through the command SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF SPOOL your_table_name.csv SELECT column1||','||column2||','||column3 FROM your_table_name; SPOOL OFF. 3. Oracle SQL Developer: Provides a graphical interface, supports exporting in multiple formats, right-click on the table and select "Export" and complete the export.
Want to know how to export table data from Oracle database? This is a common requirement in database management. Today we will talk about this issue and share some of the small experience I have accumulated in actual projects and the pitfalls I have stepped on.
The key to exporting table data from an Oracle database is to choose the right method and tool, which not only improves efficiency, but also avoids some common mistakes. Let me introduce it in detail.
First of all, we can use Oracle's own tool Data Pump, which is a powerful data export and import tool in Oracle database. Data Pump not only supports exporting single tables, but also exports entire databases or specific schemas. Exporting table data using Data Pump is very simple, like this:
-- Export table data using Data Pump expdp system/manager DIRECTORY=data_pump_dir TABLES=your_table_name DUMPFILE=your_table_name.dmp LOGFILE=export_log.log
This command will export the data of your_table_name
table to your_table_name.dmp
file, and generate a log file export_log.log
. In actual operation, I found that a small trick to using Data Pump is that you can improve the export speed through PARALLEL
parameters, such as:
expdp system/manager DIRECTORY=data_pump_dir TABLES=your_table_name DUMPFILE=your_table_name.dmp LOGFILE=export_log.log PARALLEL=4
However, Data Pump may encounter performance bottlenecks when exporting large tables, especially when there are a large amount of LOB data in the table. At this time, you can consider using SQL*Plus to export data. Although the speed may not be as fast as Data Pump, it is more flexible and suitable for some special scenarios. for example:
-- Export table data using SQL*Plus SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF SPOOL your_table_name.csv SELECT column1||','||column2||','||column3 FROM your_table_name; SPOOL OFF
This method will export the table data to a CSV file to facilitate subsequent processing and analysis. It should be noted that special characters and data formats need to be processed manually when exporting SQL*Plus, which may be a little more troublesome.
In addition, another tool I personally like is Oracle SQL Developer, which provides a graphical interface that can easily export table data. When using SQL Developer to export table data, you can choose a variety of formats, such as CSV, XLSX, etc., and the operation is also very simple:
- Right-click on the table to be exported
- Select "Export"
- Select the export format and destination path
- Click "Next" to complete the export
However, when SQL Developer exports large data volumes, it may encounter insufficient memory problems. At this time, it is necessary to adjust the JVM parameters or export in batches.
In actual projects, I have also encountered some interesting problems, such as insufficient permissions during the export process. At this time, it is key to ensure that the user has the correct permissions. You can check and grant permissions through the following commands:
-- Check user permissions SELECT * FROM USER_SYS_PRIVS; -- Grant export permissions GRANT EXP_FULL_DATABASE TO your_username;
Finally, I would like to share a tip: before exporting the data, it is recommended to back up the database first, just in case. Oracle provides RMAN (Recovery Manager) for backup and recovery, which is very practical.
In general, there are many ways to export table data from Oracle databases, each with its advantages and disadvantages. Choosing the right method can not only improve efficiency, but also avoid some common mistakes and problems. Hope these experiences and suggestions will help you!
The above is the detailed content of How to export table data from oracle database. For more information, please follow other related articles on the PHP Chinese website!

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