Help Center/ GaussDB(DWS)/ Developer Guide/ Standard data warehouse (9.1.0.x)/ GaussDB(DWS) Development Design Proposal/ Detailed Design Rules for GaussDB(DWS) Objects/ GaussDB(DWS) Database Object Naming Rules
Updated on 2024-12-18 GMT+08:00
View PDF
Share

GaussDB(DWS) Database Object Naming Rules

The name of a database object must contain 1 to 63 characters, start with a letter or underscore (_), and can contain letters, digits, underscores (_), and dollar signs ($).

  • [Proposal] Do not use reserved or non-reserved keywords to name database objects.

    You can run SELECT * FROM pg_get_keywords() to query GaussDB(DWS) keywords or view the keywords in section "Keywords" in SQL Syntax Reference.

  • [Proposal] Do not use strings enclosed in double quotation marks to define database object names. In GaussDB(DWS), double quotation marks are used to specify that the enclosed database object names are case sensitive. Case sensitivity of database object names makes problem location difficult.
  • [Proposal] Use the same naming format for database objects.
    • In a system undergoing incremental development or service migration, you are advised to comply with its historical naming conventions.
    • A database object name consists of letters, digits, and underscores (_); and cannot start with a digit. You are advised to use multiple words separated with hyphens (-).
    • You are advised to use intelligible names and common acronyms or abbreviations for database objects. Acronyms or abbreviations that are generally understood are recommended. For example, you can use English words indicating actual business terms. The naming format should be consistent within a cluster.
    • A variable name must be descriptive and meaningful. It must have a prefix indicating its type.
  • [Proposal] The name of a table object should indicate its main characteristics, for example, whether it is an ordinary, temporary, or unlogged table.
    • An ordinary table name should indicate the business relevant to a data set.
    • Temporary tables are named in the format of tmp_Suffix.
    • Unlogged tables are named in the format of ul_Suffix.
    • Foreign tables are named in the format of f_Suffix.