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#WAITFORQUERY query1 [period [maxwaitingtime]]

#DROPALLQUERIES

This command

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drops all installed queries. It does not remove andy sources or sinks, but you can use #DROPALLSINKS or #DROPALLSOURCES for this.

Parameters

It has no parameters.

Example

#DROPALLQUERIES

#BUFFERPLACEMENT

This command is used to control how buffers are (automatically) placed within the query plan if a query is transformed (e.g. by #QUERY).

Parameters

The parameter is the name of a buffer placement strategy. Since the strategies are dynamically loaded, the availability of certain strategies depends on the current system setting (which features are installed and which not). Some possible stragies are shown in the examples.

Examples

No buffers:

#BUFFERPLACEMENT None

Adds a buffer before each operator:

#BUFFERPLACEMENT Standard Buffer Placement

Adds a buffer after each source:

#BUFFERPLACEMENT Source Buffer Placement

Adds a buffer for each query:

#BUFFERPLACEMENT Query Buffer Placement

#DOQUERYSHARING

This command switches the query sharing (which tries to optimize a query be reusing parts of already installed query plans) on or off.

Parameters

The parameter is a boolean: the parameter may be either "true" or "false".

Example

/// query sharing off
#DOQUERYSHARING false
/// query sharing on
#DOQUERYSHARING true

#DOREWRITE

This command switches the rewriting (tries to optimize a query plan by switching, deleting, splitting or merging operators without changing the query's semantics) on or off.

Parameters

The parameter is a boolean: the parameter may be either "true" or "false".

Example

/// query rewrite off
#DOREWRITE false
/// query rewrite on
#DOREWRITE true

#DROPALLQUERIES