AP HANA is a high-performance, in-memory database platform
designed for handling large-scale data processing and analytics. Understanding
system limitations is crucial for database architects, developers, and
administrators. Below, we provide a detailed breakdown of key SAP HANA
limitations, answering common questions regarding tables, columns, views,
partitions, and more.
1. Maximum Number of Tables in a Schema
The maximum number of tables allowed in a single schema is
131,072.
This limit ensures efficient database organization and management.
2. Maximum Table Name Length in SAP HANA
SAP HANA supports table names with a maximum length of 127
characters. This includes alphanumeric characters, underscores, and
other valid naming conventions.
3. Maximum Column Name Length in SAP HANA
The maximum length for a column name in SAP HANA is 127
characters. This allows descriptive column names while maintaining
efficiency in query processing.
4. Maximum Number of Columns in a Table
Each table in SAP HANA can have up to 1,000 columns.
This limitation ensures optimal performance and helps maintain query execution
speed.
5. Maximum Number of Columns in a View
Similar to tables, a view in SAP HANA can include a maximum
of 1,000 columns. This restriction ensures that views remain manageable
and performant.
6. Maximum Number of Partitions in a Column Table
A column-store table in SAP HANA can have up to 1,000
partitions. Partitioning improves data management and query performance
by distributing the workload efficiently.
7. Maximum Number of Rows in Each Table
-
Row Store (RS): The maximum number of rows is limited
by available storage. The formula is 1TB / sizeof(row).
-
Column Store (CS): The maximum number of rows is determined
by the number of partitions, with an upper limit of 2³¹ rows per partition.
8. Where to Find Current System Limits in SAP HANA?
You can retrieve the current system limits by querying the
M_SYSTEM_LIMITS
table. This table provides real-time system restrictions and capacity details.
9. Maximum Number of Jobs Displayed in the Job Log (Current
Tab)
The Job Log (Current tab) can display a maximum of
5
jobs. This helps administrators monitor active jobs without excessive
system resource consumption.
Conclusion
SAP HANA imposes specific limitations to ensure performance,
stability, and scalability. By understanding these constraints, database
administrators can optimize system usage, design efficient schemas, and
enhance query execution. |
SAP HANA
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