Howard Wilkinson wrote:
I am working on some upgrades to the MyDNS open source product. I have some expertise in MySQL but am not overly familiar with PostgreSQL and need some guidance on how to query the schema for the maximum size of data a column can hold.

Unless you're after PG-specific stuff, it's probably best to use the information-schema.

http://www.postgresql.org/docs/8.3/static/information-schema.html

This has a standard layout cross-database, so will help you to extend you app across other systems. I think it's supported in the latest version of MySQL too.

--
  Richard Huxton
  Archonet Ltd

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

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