CacheSize (Property)

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Retrieving the records

Management of the Property CacheSize

hQueryWithoutCorrection constant

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Equivalence
Retrieving the records
Management of the Property CacheSize
hQueryWithoutCorrection constant

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HFSQL properties

CacheSize (Property)

In french: TailleCache

Available only with these kinds of connection

The Property SizeCache makes it possible to:

Know the maximum number of records that can be contained in the Native Connector MySQL cache.
Modify the maximum number of records that can be contained in the Native Connector MySQL cache. In this case, if the connection is currently opened, it will be closed and reopened with the new parameters during the first access to a file that uses this connection.

Remark: The connection can correspond to:

a connection described in the data model editor,
a connection described by HConnect, HDescribeConnection or HOpenConnection.
a connection described by a Connection variable.

Example

// Modify the cache size of the Native Connector MySQL used by
// MyConnection
MyConnection.CacheSize = 450

Syntax

Finding out the size of the cache for a connection Hide the details

<Cache size> = <Connection used>.CacheSize

<Cache size>: Integer

Size of the Native Connector MySQL cache.
If this parameter corresponds to:
-2: the cache size is the size per Default (100 for the Native Connector MySQL).
-1: the size of cache is unlimited.
0: the cache stores no record. No record is retrieved.

<Connection used>: Character string (with or without quotes) or Connection variable

Name of connection used. This name was defined:
in the data model editor,
by HDescribeConnection or HOpenConnection,
by the Connection type.

Defining the size of the cache for a connection Hide the details

<Connection used>.CacheSize = <Cache size>

<Connection used>: Character string (with or without quotes) or Connection variable

Name of connection used. This name was defined:
in the data model editor,
by HDescribeConnection or HOpenConnection,
by the Connection type.

<Cache size>: Integer

New cache size for Native Connector MySQL.
If this parameter corresponds to:
-2: the cache size will be the size by Default (100 for the Native Connector MySQL).
-1: the size of the cache will be unlimited.
0: the cache will store no record. No record will be retrieved.

Remarks

Equivalence

CtCacheSize is used to define the size of the cache for a MySQL connection. This property is kept for backward compatibility. It is advisable to use the Property CacheSize.

Retrieving the records

The speed at which the entire set of records is retrieved is proportional to the size of the cache: the larger the cache size, the faster the records are retrieved.

However, the smaller the cache size, the faster the first record will be read.

Caution: The memory used by the cache is proportional to the size of the cache.

Management of the Property CacheSize

The Property CacheSize is managed only by the Native Connector MySQL.

The other Native Connectors s do not manage the CacheSizeproperty. . In this case, the use of this property will be ignored and no error will be generated.

hQueryWithoutCorrection constant

If the query is run while no check is performed on the SQL code (hQueryWithoutCorrection constant): the size will be unlimited and cannot be modified with the Property CacheSize.