module ActiveRecord::ConnectionAdapters::DatabaseLimits
Public Instance Methods
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.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 33 def allowed_index_name_length index_name_length end
Returns the maximum length of a column name.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 17 def column_name_length max_identifier_length end
Returns the maximum number of columns in a multicolumn index.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 55 def columns_per_multicolumn_index 16 end
Returns the maximum number of columns per table.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 43 def columns_per_table 1024 end
Returns the maximum number of elements in an IN (x,y,z) clause.
nil
means no limit.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 62 def in_clause_length nil end
Returns the maximum length of an index name.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 38 def index_name_length max_identifier_length end
Returns the maximum number of indexes per table.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 49 def indexes_per_table 16 end
Returns maximum number of joins in a single query.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 73 def joins_per_query 256 end
Returns the maximum length of an SQL query.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 67 def sql_query_length 1048575 end
Returns the maximum length of a table alias.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 12 def table_alias_length max_identifier_length end
Returns the maximum length of a table name.
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 23 def table_name_length max_identifier_length end
Private Instance Methods
# File lib/active_record/connection_adapters/abstract/database_limits.rb, line 79 def bind_params_length 65535 end