ActiveRecord::ConnectionAdapters::DatabaseLimits

Methods

allowed_index_name_length
column_name_length
columns_per_multicolumn_index
columns_per_table
in_clause_length
index_name_length
indexes_per_table
joins_per_query
sql_query_length
table_alias_length
table_name_length

Instance Public methods

allowed_index_name_length()

Returns the maximum allowed length for an index name. This limit is enforced by Rails and is less than or equal to index_name_length. The gap between index_name_length is to allow internal Rails operations to use prefixes in temporary operations.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 34
      def allowed_index_name_length
        index_name_length
      end

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column_name_length()

Returns the maximum length of a column name.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 18
      def column_name_length
        max_identifier_length
      end

🔎 See on GitHub

columns_per_multicolumn_index()

Returns the maximum number of columns in a multicolumn index.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 56
      def columns_per_multicolumn_index
        16
      end

🔎 See on GitHub

columns_per_table()

Returns the maximum number of columns per table.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 44
      def columns_per_table
        1024
      end

🔎 See on GitHub

in_clause_length()

Returns the maximum number of elements in an IN (x,y,z) clause. nil means no limit.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 63
      def in_clause_length
        nil
      end

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index_name_length()

Returns the maximum length of an index name.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 39
      def index_name_length
        max_identifier_length
      end

🔎 See on GitHub

indexes_per_table()

Returns the maximum number of indexes per table.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 50
      def indexes_per_table
        16
      end

🔎 See on GitHub

joins_per_query()

Returns maximum number of joins in a single query.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 74
      def joins_per_query
        256
      end

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sql_query_length()

Returns the maximum length of an SQL query.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 68
      def sql_query_length
        1048575
      end

🔎 See on GitHub

table_alias_length()

Returns the maximum length of a table alias.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 13
      def table_alias_length
        max_identifier_length
      end

🔎 See on GitHub

table_name_length()

Returns the maximum length of a table name.

📝 Source code

# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 24
      def table_name_length
        max_identifier_length
      end

🔎 See on GitHub