Technical Specification of SAP DB Version 7.3
Restrictions
Maximum Value | |
Database size |
32 TB (with 8 KB page size) |
Number of files/devspaces per database |
256 |
File/devspace size (data) |
128 GB (depending on operating system limitations) |
File/devspace size (log) |
16 TB (depending on operating system limitations) |
Number of sessions per user |
8 |
SQL statement length |
>= 16 KB (Default value 64 KB, defined by a system variable) |
SQL character string length |
Defined by a system variable |
Identifier length |
32 characters |
Numeric precision |
38 places |
Number of tables |
unlimited |
Number of columns per table (with KEY) |
1024 |
Number of columns per table (without KEY) |
1023 |
Number of primary key columns per table |
512 |
Number of columns in an index |
16 |
Number of foreign key columns per table |
16 |
Number of columns in an ORDER or a GROUP clause |
128 |
Number of columns in a SELECT statement |
1023 |
Number of columns in an INSERT statement |
1024 |
Number of columns in a results table |
1023 |
Number of join tables in a SELECT statement |
64 |
Number of triggers per Basis table |
3 |
Number of UNIQUE indexes per table |
510 |
Number of indexes per table |
510 |
Number of named indexes per table |
255 |
Number of referring CONSTRAINT definitions (foreign key dependencies) per table |
unlimited |
Number of references per table |
unlimited |
Number of rows per table |
limited by database size |
Internal length of a table row |
8088 Bytes |
Total of internal lengths of all primary key columns |
1024 Bytes |
Total of internal lengths of all foreign key columns |
1024 Bytes |
Total of internal lengths of all columns belonging to an index |
1024 Bytes |
Internal length of a LONG column |
2 GB |
Length of columns in an ORDER or a GROUP clause |
1020 Bytes |
Nested trigger levels |
unlimited |
Nested subqueries |
127 |
Number of join conditions in a WHERE clause of a SELECT statement |
128 |
Number of correlated columns in an SQL statement |
64 |
Number of correlated tables in an SQL statement |
16 |
Number of parameters in an SQL statement |
2000 |