[SAP HANA] HANA 參數管理

1. 參數管理
2. tenant 的參數管理
3. 參數的物理位置
4. 參數的作用域

1.參數管理

　　SAP HANA 2.0 SPS04 view CONFIGURATION_PARAMETER_PROPERTIES and M_CONFIGURATION_PARAMETER_VALUES，檢查哪些參數需要重啟系統，在那個ini 文件存儲，描述，作用，默認值，單位（ms,md,Day 等等），推薦值，使用限制（rangle,layer,custom,system_managed），只讀。

　　SAP HANA 2.0 SPS04 需要重啟和無效的參數會出現alert

M_CUSTOMIZABLE_FUNCTIONALITIES display metadata and properties of the public configuration parameters for SAP HANA.
M_CONFIGURATION_PARAMETER_VALUES display landscape service parameter values，可以識別修改參數是否需要重啟系統。

CONFIGURATION_PARAMETER_PROPERTIES 顯示metadata 和SAP HANA  公共配置屬性

  2. tenant 參數，

• • backlist parameter for tenant usage　　　　multidb.ini need INIFLE ADMIN
  • disable features for a tenant 　　　    　   　system view　M_CUSTOMIZABLE_FUNCTIONALITIES provides information about those features that can be disabled and their status，this view exist in the SYS schema .SYS_DATABASES 在system數據庫，顯示所有數據庫激活的特性在
  • additional SAP HANA feature　　               SYS_DATABASES enablement of feature in all Database.

Note:

system properties that are included in the multidb.ini by default cannot be changed by the tenant db admin.
but system admin can still change these properties in the system db in all layers.the multidb.ini file shows the blacklisted parameter for the tenant db as read-only

select "name","description","is_enabled" from "SYS"."M_CUSTOMIZABLE_FUNCTIONALITIES"

 3.參數文件位置 :

• Default  configurations:　　 　　    /usr/sap/<SID>/HDB<instanc>/exe/config (read only)
• system configurations:                 /usr/sap/<SID>/SYS/global/hdb/custom/config
• Tenant-specific configurations:      /usr/sap/<SID>/SYS/global/hdb/custom/config/DB_<tenant-name>
• Host-specific configurations:         /usr/sap/<SID>/HDB<instance number>/<hostname

4. 參數的作用域

• default :系統的默認值
• system 列,當前系統配置的值,如為空,使用默認值
• DB列,對基本個DB起作用
• host 列,只對某個host

Layer	Description
System	The value configured for the system applies to the system as whole, including all hosts of multi-host systems and all tenant databases of multi-DB systems.
Host	For some properties, it is possible to set host-specific values if the system has multiple hosts. If host-specific values are possible, you can expand the Hosts area of the Change Configuration Value dialog box, select the relevant host(s), and enter the host-specific value(s). It is possible to enter both a value for the system as a whole and for individual hosts. In this case, the system-specific value only applies to those hosts that do not have a host-specific value.
Database	For some properties, it is possible to set database-specific values if the system has tenant databases. If database-specific values are possible for a given property, they can be configured both in the system database and the tenant database. From the system database, you can configure database-specific values for all tenant databases in the system. From a tenant database, you can configure database-specific values only for that database. It is possible to enter a value for the system as a whole and individual databases. In this case, the system-specific value only applies to those databases that do not have a database-specific value.

 

 

 

Note: 2036111 - Configuration parameters for the SAP HANA system

　　2600030 Parameter Recommendations in SAP HANA Environments