Comparison of SAP DB and Version 6.1 

Comparison of Selected Maximum Values

 

SAP DB 7.3

Version 6.1

Identifier length

32 characters

18 characters

Numeric precision

38 places

18 places

SQL statement length

>= 16 KB

8240 Bytes

Internal length of a table row

8088 Bytes

4047 Bytes

Number of columns per table (with KEY)

1024

255

Number of columns per table (without KEY)

1023

254

Number of key columns per table

512

127

Total of internal lengths of all key columns

1024 Bytes

255 Bytes

Number of results columns in a SELECT statement

1023

254

Number of join tables in a SELECT statement

64

16

Number of join conditions in a WHERE clause of a SELECT statement

128

64

Length of columns in an ORDER or a GROUP clause

1020 Bytes

250 Bytes

Number of parameters in an SQL statement

2000

300

Field length n for data type CHAR(n) Unicode/Non-Unicode

4000/8000 characters

-/4000 characters

 

Comparison of Functions

SAP DB 7.3

Version 6.1

No checkpoints – no wait situations.

Checkpoints only at restart and shutdown of the database.

Checkpoints cause wait situations.

Checkpoints at log and data backup, restart and shutdown, and at log segment completion.

No database downtime at database full.

You can add devspaces without restarting.
Application sessions remain open.

Database downtime at database full.

You must restart the database after adding devspaces.
You must restart applications.

No database downtime at log full.

Wait for log save completion with running database.
Application sessions remain open.

Database downtime at log full.

You must backup the log.
You must restart applications.

Parallel restore log.

Restore log uses one read task and multiple redo tasks.
Redo starts immediately.
Multiple redo sessions.

Sequential restore log.

Restore log copies all log entries from tape to the log device.
Redo waits until copy completion.
Single redo session.

You can automatically backup log in parallel to data backup.

Log and data backup are mutually exclusive.

Optimized lock list.

Locklist can contain up to 1000 entries.

Asynchronous mass DELETE and deletion of a table.

Synchronous mass DELETE and deletion of a table.