ALTER LS POLICY Statement

Modifies some or all option values for the root logical server policy or a user-created logical server policy. This statement enforces consistent shared system temporary store settings across physical nodes shared by logical servers.

Quick Links:

Go to Parameters

Go to Examples

Go to Usage

Go to Permissions

Syntax

ALTER LS POLICY ls-policy-name ls-option-value-list 
   [ WITH STOP SERVER ]  
	
ls-option-value-list - (back to Syntax)
   { ls-option-name = ls-policy-option-value } ...

ls-option-name - (back to ls-option-value-list)
   ALLOW_COORDINATOR_AS_MEMBER
   | DQP_ENABLED 
   | ENABLE_AUTOMATIC_FAILOVER 
   | LOGIN_REDIRECTION
   | REDIRECTION_WAITERS_THRESHOLD
   | TEMP_DATA_IN_SHARED_TEMP

Parameters

(back to top)

ls-policy-name – the name of the logical server policy. Specify root to modify the root logical server policy.

ls-option-value-list – the name of the logical server policy option. See Usage for list of options.

ls-policy-option-value – any unspecified option inherits its value from the root logical server policy. See Usage.

WITH STOP SERVER – automatically shuts down all servers in the logical server when the TEMP_DATA_IN_SHARED_TEMP option is changed directly or indirectly.

Applies to

Multiplex only.

Examples

(back to top)

Example 1 – alters the logical server policy:

ALTER LS POLICY root
ALLOW_COORDINATOR_AS_MEMBER=ON

Example 2 – alters the logical server policy and causes servers to shut down automatically when the option value changes:
```
ALTER LS POLICY root
TEMP_DATA_IN_SHARED_TEMP=ON WITH STOP SERVER
```

Usage

(back to top)

If you want a smaller IQ_SYSTEM_TEMP dbspace, set TEMP_DATA_IN_SHARED_TEMP to ON, which writes temporary data to IQ_SHARED_TEMP instead of IQ_SYSTEM_TEMP. In a distributed query processing environment, however, setting both DQP_ENABLED and TEMP_DATA_IN_SHARED_TEMP to ON may saturate your SAN with additional data in IQ_SHARED_TEMP, where additional I/O operations against IQ_SHARED_TEMP may adversely affect DQP performance.

Option	Description
ALLOW_COORDINATOR_AS_MEMBER	Can only be set for the ROOT logical server policy. When ON (the default), the coordinator can be a member of any user-defined logical server. OFF prevents the coordinator from being used as a member of any user-defined logical servers. Values – ON, OFF Default – ON
DQP_ENABLED	When set to 0, query processing is not distributed. When set to 1 (the default), query processing is distributed as long as a writable shared temporary file exists. When set to 2, query processing is distributed over the network, and the shared temporary store is not used. Values – 0, 1, 2 Default – 1
ENABLE_AUTOMATIC_FAILOVER	Can only be set for the ROOT logical server policy. When ON, enables automatic failover for logical servers governed by specified login policy. When OFF (the default), disables automatic failover at the logical server level, allowing manual failover. Specify DEFAULT to set back to the default value. Values – ON, OFF, DEFAULT Default – OFF
LOGIN_REDIRECTION	When ON, enables login redirection for logical servers governed by specified login policy. When OFF (the default), disables login redirection at the logical server level, allowing external connection management. Values – ON, OFF Default – OFF
REDIRECTION_WAITERS_THRESHOLD	Specifies how many connections can queue before SAP Sybase IQ redirects a connection to this logical server to another server. Can be any integer value; default is 5. Values – Integer Default – 5
TEMP_DATA_IN_SHARED_TEMP	When ON, all temporary table data and eligible scratch data writes to the shared temporary store, provided that the shared temporary store has at least one read-write file added. You must restart all multiplex nodes after setting this option or after adding a read-write file to the shared temporary store. (If the shared temporary store contains no read-write file, or if you do not restart nodes, data is written to `IQ_SYSTEM_TEMP` instead.) When OFF (the default), all temporary table data and scratch data writes to the local temporary store. Values – ON, OFF Default – OFF

Permissions

(back to top)

Requires the MANAGE MULTIPLEX system privilege.