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Module: ActiveRecord::ConnectionAdapters::DatabaseLimits

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
Defined in: activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb

Instance Method Summary

Instance Method Details

#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.

[ GitHub ]

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

def allowed_index_name_length
  index_name_length
end

#column_name_length

Returns the maximum length of a column name.

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 12

def column_name_length
  64
end

#columns_per_multicolumn_index

Returns the maximum number of columns in a multicolumn index.

[ GitHub ]

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

def columns_per_multicolumn_index
  16
end

#columns_per_table

Returns the maximum number of columns per table.

[ GitHub ]

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

def columns_per_table
  1024
end

#in_clause_length

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

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 52

def in_clause_length
  nil
end

#index_name_length

Returns the maximum length of an index name.

[ GitHub ]

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

def index_name_length
  64
end

#indexes_per_table

Returns the maximum number of indexes per table.

[ GitHub ]

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

def indexes_per_table
  16
end

#joins_per_query

Returns maximum number of joins in a single query.

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 62

def joins_per_query
  256
end

#sql_query_length

Returns the maximum length of an SQL query.

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 57

def sql_query_length
  1048575
end

#table_alias_length

Returns the maximum length of a table alias.

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 7

def table_alias_length
  255
end

#table_name_length

Returns the maximum length of a table name.

[ GitHub ]

  
# File 'activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb', line 17

def table_name_length
  64
end