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- Retrieving the records
- CtCacheSize property support
- hQueryWithoutCorrection constant
CtCacheSize (Property) In french: CxTailleCache
  Available only with these kinds of connection
The CtCacheSize property is used to determine and change the maximum number of records that can be stored in the cache of the Native MySQL Connector. Note: The cache size specified with the CtCacheSize property is ignored if this size has been specified directly in the optional information of functions HDescribeConnection or HOpenConnection. Cache management: how it works
Each time an external database is accessed, the retrieved records are stored in the cache of the Native Connector used before being transmitted to the client computer.
The cache of a Native Connector can only contain a limited number of records. If the number of records to retrieve is greater than the maximum number of records defined for the cache, the records are retrieved in batches.
The maximum number of records that can be stored in the cache corresponds to the size of the cache. For example, if the cache size of the Native Connector is equal to 10, the cache will be filled 3 times when executing a query that selects 24 records: - 10 records.
- 10 records.
- 4 records.
MyConnection.CtCacheSize = 450
Syntax
Determining the cache size of the Native MySQL Connector Hide the details
<Cache size> = <Connection name>.CtCacheSize
<Cache size>: Integer Cache size of the Native MySQL Connector.If this parameter corresponds to: - -2: cache size is the default size (100 for MySQL Native Connector).
- -1: cache size is unlimited.
- 0: cache stores no records. No record is retrieved.
<Connection name>: Character string Name of the connection used. This name was defined in the data model editor, or with HDescribeConnection or HOpenConnection.
Changing the cache size of the Native MySQL Connector Hide the details
<Connection name>.CtCacheSize = <Cache size>
<Connection name>: Character string Name of the connection used. This name was defined in the data model editor, or with HDescribeConnection or HOpenConnection. <Cache size>: Integer New cache size of the Native MySQL Connector.If this parameter corresponds to: - -2: cache size will be the default size (100 for MySQL Native Connector).
- -1: cache size will be unlimited.
- 0: the cache will not store any records. No record will be retrieved.
Remarks Retrieving the records The speed with which all records are retrieved is proportional to the size of the cache: the larger the cache, the faster the retrieval speed. However, the smaller the cache size, the faster the first record will be read. Caution: The memory occupied by the cache is proportional to the size of the cache. CtCacheSize property support The CtCacheSize property is supported only by the Native MySQL Connector. Other Native Connectors do not support the CtCacheSize property. In this case, the use of this property will be ignored and no error will be generated. hQueryWithoutCorrection constant If the query is executed without checking the SQL code (hQueryWithoutCorrection constant), the cache will have an unlimited size and cannot be modified with the CtCacheSize property.
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