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