能否直接实现Oracle与MySQL数据库间的数据同步及双向迁移？

Absolutely, you can pull this off without any middle-tier apps like PHP—here are the most straightforward, no-middleman methods to move data between Oracle and MySQL (including occasional reverse syncs) for simple, computation-free migrations:

Oracle offers an official Oracle Database Gateway for MySQL that lets you create a direct database link from Oracle to MySQL. Once configured, you can transfer data using basic SQL statements with no extra applications involved:

• For Oracle → MySQL:

  -- First set up the database link via the gateway configuration
  CREATE DATABASE LINK mysql_connection
    CONNECT TO mysql_user IDENTIFIED BY mysql_password
    USING 'mysql_gateway_config_name';
  
  -- Copy data directly between tables
  INSERT INTO mysql_target_table@mysql_connection (col1, col2, col3)
  SELECT oracle_col1, oracle_col2, oracle_col3 FROM oracle_source_table;
  

• For occasional MySQL → Oracle syncs:
  You can use MySQL's FEDERATED storage engine (or the newer CONNECT engine in MySQL 8.0+) to link directly to Oracle tables, then run similar INSERT...SELECT statements from the MySQL side. Alternatively, reverse the Oracle Gateway setup to initiate syncs from Oracle if you prefer that workflow.

Both databases have free, user-friendly tools that handle direct, app-free data transfers:

• Oracle SQL Developer Migration Wizard: Connect to both your Oracle and MySQL instances, select the tables you want to copy, and the tool automatically handles data transfer and basic type conversion. No code required—just point-and-click through the wizard.
• MySQL Workbench Migration Wizard: Works equally well for both forward and reverse syncs. It connects directly to Oracle, pulls schema and data, and pushes it to MySQL, or does the reverse for your occasional backfill needs.

If you prefer headless, automatable operations:

• Oracle → MySQL:
  1. Export Oracle data to a dump file using expdp (Oracle Data Pump):

     expdp your_oracle_user/your_pass@oracle_db schemas=your_schema tables=target_table dumpfile=oracle_data.dmp logfile=export_log.log
     

  2. Convert the dump to a MySQL-compatible format (or export directly to CSV with sqlldr), then import using mysqlimport:

     mysqlimport --user=mysql_user --password=mysql_pass your_mysql_db oracle_data.csv
     

• MySQL → Oracle:
  1. Export MySQL data with mysqldump:

     mysqldump --user=mysql_user --password=mysql_pass your_mysql_db target_table > mysql_data.sql
     

  2. Load the exported data into Oracle using sqlldr (SQL*Loader), adjusting for minor data type mappings as needed.

• All these methods eliminate the need for middle-tier apps—data moves directly between the two databases or via official tools that act as direct connectors.
• For infrequent reverse syncs, stick to GUI tools or one-time command-line runs. If you need automation, you can script the command-line steps; heavyweight CDC tools like Oracle GoldenGate are overkill for simple, occasional transfers.

内容的提问来源于stack exchange，提问作者Steven James