Module: ActiveRecord::ConnectionAdapters::DatabaseLimits

Methods

Public Instance methods

column_name_length()

the maximum length of a column name

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 11
def column_name_length
  64
end

columns_per_multicolumn_index()

the maximum number of columns in a multicolumn index

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 36
def columns_per_multicolumn_index
  16
end

columns_per_table()

the maximum number of columns per table

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 26
def columns_per_table
  1024
end

in_clause_length()

the maximum number of elements in an IN (x,y,z) clause

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 41
def in_clause_length
  65535
end

index_name_length()

the maximum length of an index name

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 21
def index_name_length
  64
end

indexes_per_table()

the maximum number of indexes per table

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 31
def indexes_per_table
  16
end

joins_per_query()

maximum number of joins in a single query

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 51
def joins_per_query
  256
end

sql_query_length()

the maximum length of an SQL query

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 46
def sql_query_length
  1048575
end

table_alias_length()

the maximum length of a table alias

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 6
def table_alias_length
  255
end

table_name_length()

the maximum length of a table name

  # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 16
def table_name_length
  64
end