如何将SQL Anywhere 17数据迁移至SQL Anywhere 9？

Got it, migrating from SQL Anywhere 17 to 9 is a bit tricky due to the huge version gap—you can’t just open the v17 .db file directly in v9. Here’s a step-by-step, practical approach to get your data moved over:

• First, make sure SQL Anywhere 17 is installed and your database file is accessible. Start the v17 server if it’s not running:
  dbeng17 /path/to/your/v17_database.db
• Connect to the database using Interactive SQL (dbisql17) to confirm there’s no corruption or connection issues before proceeding.

Direct backup/restore won’t work across such a big version jump, so you’ll need to export content in a v9-compatible format:

Export the Schema #

• In dbisql17, go to File > Export > Schema
• Select all objects (tables, views, stored procedures, etc.) but exclude v17-specific features upfront—think things like partitioned tables, VARCHAR(MAX) data types, or column-level encryption. You’ll likely need to manually edit the generated script later to strip out any remaining v17-only syntax.

Export the Data #

• For each table, use the UNLOAD command to export data to CSV files (v9 handles CSV imports smoothly):

  UNLOAD SELECT * FROM your_table_name TO '/path/to/exports/your_table_name.csv' FORMAT TEXT;
  

• If you prefer INSERT statements instead, use the export wizard to generate them—but note that large datasets might create oversized scripts, so split them into chunks if needed.

• Install SQL Anywhere 9 and start its database server:
  dbeng9
• Create a fresh empty database using dbinit9:
  dbinit9 /path/to/new_v9_database.db
• Connect to this new database with dbisql9.

• Open the edited schema script from v17 in dbisql9.
• Double-check for any leftover v17-specific code:
  • Replace VARCHAR(MAX) with VARCHAR(n) (pick a valid length for v9)
  • Remove partition clauses, modern trigger syntax, or unsupported stored procedure features
• Run the cleaned-up script to create all your database objects in v9.

• For each CSV file you exported:
  • Use the LOAD TABLE command in dbisql9 to import the data:

    LOAD TABLE your_table_name FROM '/path/to/exports/your_table_name.csv' FORMAT TEXT;
    

  • If you used INSERT statements, run those scripts (again, split large files to avoid memory errors).
• After importing, cross-verify row counts between v17 and v9 tables to ensure no data was lost.

• Test all stored procedures, triggers, and views to confirm they function correctly in v9.
• Check for data truncation issues (e.g., long strings from v17 that don’t fit v9’s VARCHAR limits).
• Verify your application can connect to the v9 database using the appropriate v9 driver.

内容的提问来源于stack exchange，提问作者prefect