Methods
Public Instance methods
column_name_length()

the maximum length of a column name

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 11
11:       def column_name_length
12:         64
13:       end
columns_per_multicolumn_index()

the maximum number of columns in a multicolumn index

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 36
36:       def columns_per_multicolumn_index
37:         16
38:       end
columns_per_table()

the maximum number of columns per table

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 26
26:       def columns_per_table
27:         1024
28:       end
in_clause_length()

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

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 41
41:       def in_clause_length
42:         65535
43:       end
index_name_length()

the maximum length of an index name

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 21
21:       def index_name_length
22:         64
23:       end
indexes_per_table()

the maximum number of indexes per table

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 31
31:       def indexes_per_table
32:         16
33:       end
joins_per_query()

maximum number of joins in a single query

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 51
51:       def joins_per_query
52:         256
53:       end
sql_query_length()

the maximum length of a SQL query

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 46
46:       def sql_query_length
47:         1048575
48:       end
table_alias_length()

the maximum length of a table alias

[ show source ]

   # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 6
6:       def table_alias_length
7:         255
8:       end
table_name_length()

the maximum length of a table name

[ show source ]

    # File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 16
16:       def table_name_length
17:         64
18:       end