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Hints Additional settings can be applied to queries via hints . Supported Query Hints ObjectDB supports the following query hints : "javax.persistence.query.timeout" - sets maximum query execution time ... . Setting Query Hint (Scopes) Query hints can be set in the following scopes (from global to local

some years ago there was a chat around query hints http://www.objectdb.com/issue/2417 we are currently trying that with the latest version but we do not see that our hint is used this is the query ... )']] but the index that is in the hint is not used   the MultiVarPlan that is listed shows our index in

JPA Annotation Attribute in javax.persistence.NamedStoredProcedureQuery QueryHint [] hints default {} Query properties and hints . (May include vendor-specific query hints .) Since: JPA 2.1

JPA Annotation Attribute in javax.persistence.NamedQuery QueryHint [] hints default {} (Optional) Query properties and hints . May include vendor-specific query hints . Since: JPA 1.0

JPA Annotation Attribute in javax.persistence.NamedNativeQuery QueryHint [] hints default {} Query properties and hints . (May include vendor-specific query hints .) Since: JPA 1.0

occurs a LockTimeoutException is thrown immediately. The "javax.persistence.lock.timeout"   hint ... ;The hint can be set in several scopes: For the entire persistence unit - using a persistence.xml   ... . setProperty ("javax.persistence.lock.timeout", 4000); In addition, the hint can be set for a specific

and the database file can improve performance. The max attribute is a hint that specifies the space ... engine settings: The cache attribute is a hint that specifies the amount of memory that is used

itself and are demonstrated above. The two optional elements,  lockMode and hints , provide static replacement

Second thing after @FetchGroup I've found is read-only hint for EM. You can specify this hint to EM when executing query meaning that returned data will never be edited or persisted. My understanding of this is that each entity returned from query is in detached state as default state. query

causes only statement-level rollback If a vendor-specific property or hint is not recognized, it is silently ignored. Portable applications should not rely on the standard timeout hint . Depending on the database in use and the locking mechanisms used by the provider, the hint may or may not be observed

manager. Return: flush mode Since: JPA 2.0 Map getHints () Get the properties and hints and associated values that are in effect for the query instance. Return: query properties and hints Since: JPA 2.0 ... 1.0 Query setHint (String hintName, Object value) Set a query property or hint

and hints and associated values that are in effect for the query instance. Return: query properties and hints Inherited from: Query Since: JPA 2.0 LockModeType getLockMode () Get the current lock mode ... setHint (String hintName, Object value) Set a query property or hint . The hints elements

Inherited from: Query Since: JPA 2.0 Map getHints () Get the properties and hints and associated values that are in effect for the query instance. Return: query properties and hints Inherited from: Query ... ;hintName, Object value) Set a query property or hint . The hints elements may be used

;   Object value ) Set a query property or hint . The hints elements may be used to specify query properties and hints . Properties defined by this specification must be observed by the provider. Vendor-specific hints that are not recognized by a provider must be silently ignored. Portable

,    Object value ) Set a query property or hint . The hints elements may be used to specify query properties and hints . Properties defined by this specification must be observed by the provider. Vendor-specific hints that are not recognized by a provider must be silently ignored

;String hintName,    Object value ) Set a query property or hint . The hints elements may be used to specify query properties and hints . Properties defined by this specification must be observed by the provider. Vendor-specific hints that are not recognized by a provider

. The hints element may be used to specify query properties and hints . Properties defined by this specification must be observed by the provider. Vendor-specific hints that are not recognized by a provider ... Public Annotation Attributes QueryHint [] hints default {} Query properties and hints . (May include

JPA Annotation QueryHint Implemented Interfaces: Annotation Used to supply a query property or hint to the NamedQuery or NamedNativeQuery annotation. Vendor-specific hints that are not recognized by ... of the hint . Since: JPA 1.0 String value default null Value of the hint . Since: JPA 1.0

property or hint is not recognized, it is silently ignored. Portable applications should not rely on the standard timeout hint . Depending on the database in use and the locking mechanisms used by the provider, the hint may or may not be observed. Parameters: entity - entity instance lockMode - lock

;propertyName,    Object value ) Set an entity manager property or hint . If a vendor-specific property or hint is not recognized, it is silently ignored. Parameters: propertyName - name of property or hint value - value for property or hint Throws: IllegalArgumentException - if the second

-specific property or hint is not recognized, it is silently ignored. Portable applications should not rely on the standard timeout hint . Depending on the database in use and the locking mechanisms used by the provider, the hint may or may not be observed. Parameters: entity - entity instance lockMode

If a vendor-specific property or hint is not recognized, it is silently ignored. Portable applications should not rely on the standard timeout hint . Depending on the database in use and the locking mechanisms used by the provider, the hint may or may not be observed. Parameters: entityClass - entity

Attributes QueryHint [] hints default {} (Optional) Query properties and hints . May include vendor-specific query hints . Since: JPA 1.0 LockModeType lockMode default NONE (Optional) The lock mode type

QueryHint [] hints default {} Query properties and hints . (May include vendor-specific query hints

JPA Method in javax.persistence.Query Map getHints () Get the properties and hints and associated values that are in effect for the query instance. Return: query properties and hints Since: JPA 2.0

strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER ... may be null. This is a hint and is disregarded for primitive types; it may be used in schema

JPA Method in javax.persistence.EntityManager Map getProperties () Get the properties and hints and associated values that are in effect for the entity manager. Changing the contents of the map does not change the configuration in effect. Return: map of properties and hints in effect for entity manager Since: JPA 2.0

on the persistence provider runtime that data must be eagerly fetched. The LAZY strategy is a hint ... . The implementation is permitted to eagerly fetch data for which the LAZY strategy hint has been specified. Example

property or hint is not recognized, it is silently ignored. Parameters: entity - entity instance properties - standard and vendor-specific properties and hints Throws: IllegalArgumentException

-specific property or hint is not recognized, it is silently ignored. Parameters: entityClass - entity class primaryKey - primary key properties - standard and vendor-specific properties and hints Return

runtime that the associated entities must be eagerly fetched. The LAZY strategy is a hint

strategy is a hint to the persistence provider runtime. Since: JPA 2.0 Class targetClass default

definition. This includes configuration information such as max results, hints , flush mode, lock mode

results, hints , flush mode, lock mode, result set mapping information, and information about stored

must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA

. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA 1.0

that the associated entities must be eagerly fetched. The LAZY strategy is a hint to the persistence provider

. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA 1.0

. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA 1.0

. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA 1.0

is a hint to the persistence provider runtime. Since: JPA 1.0 boolean optional default true

fetched. The LAZY strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER . Since: JPA 1.0

JPA Annotation Attribute in javax.persistence.QueryHint String name default null Name of the hint . Since: JPA 1.0

JPA Annotation Attribute in javax.persistence.QueryHint String value default null Value of the hint . Since: JPA 1.0

JPA Annotation Attribute in javax.persistence.Basic boolean optional default true (Optional) Defines whether the value of the field or property may be null. This is a hint and is disregarded for primitive types; it may be used in schema generation. If not specified, defaults to true . Since: JPA 1.0

fetched. The LAZY strategy is a hint to the persistence provider runtime. Since: JPA 2.0

JDO Interface Sequence Implementations of this interface can be used to obtain sequences. The behavior with regard to the transaction and rollover behavior are defined in the metadata. Since: JDO 2.0 Public Methods void allocate (int additional) Provides a hint to the implementation

JDO Method in javax.jdo.datastore.Sequence void allocate (   int additional ) Provides a hint to the implementation that the application will need additional sequence value objects in short order. There is no externally visible behavior of this method. It is used to potentially

and provide a hint to the query to prepare and optimize an execution plan. Since: JDO 1.0 void

JDO Method in javax.jdo.Query void compile () Verify the elements of the query and provide a hint to the query to prepare and optimize an execution plan. Since: JDO 1.0