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. |
Database downtime at database full. You must restart the database after adding devspaces. |
No database downtime at log full. Wait for log save completion with running database. |
Database downtime at log full. You must backup the log. |
Parallel restore log. Restore log uses one read task and multiple redo tasks. |
Sequential restore log. Restore log copies all log entries from tape to the log device. |
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. |