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 26
      def allowed_index_name_length
        index_name_length
      end

🔎 See on GitHub

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 12
      def column_name_length
        64
      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 46
      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 36
      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 52
      def in_clause_length
        nil
      end

🔎 See on GitHub

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 31
      def index_name_length
        64
      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 41
      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 62
      def joins_per_query
        256
      end

🔎 See on GitHub

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 57
      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 7
      def table_alias_length
        255
      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 17
      def table_name_length
        64
      end

🔎 See on GitHub