Module: ActiveRecord::ConnectionAdapters::DatabaseLimits

Included in:
AbstractAdapter
Defined in:
activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb

Instance Method Summary collapse

Instance Method Details

#column_name_lengthObject

the maximum length of a column name



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 11

def column_name_length
  64
end

#columns_per_multicolumn_indexObject

the maximum number of columns in a multicolumn index



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 36

def columns_per_multicolumn_index
  16
end

#columns_per_tableObject

the maximum number of columns per table



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 26

def columns_per_table
  1024
end

#in_clause_lengthObject

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



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 41

def in_clause_length
  65535
end

#index_name_lengthObject

the maximum length of an index name



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 21

def index_name_length
  64
end

#indexes_per_tableObject

the maximum number of indexes per table



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 31

def indexes_per_table
  16
end

#joins_per_queryObject

maximum number of joins in a single query



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 51

def joins_per_query
  256
end

#sql_query_lengthObject

the maximum length of a SQL query



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 46

def sql_query_length
  1048575
end

#table_alias_lengthObject

the maximum length of a table alias



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 6

def table_alias_length
  255
end

#table_name_lengthObject

the maximum length of a table name



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# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 16

def table_name_length
  64
end