Behavior of Fetchsize on Application Server

I have not been able to find this documented anywhere and I'm hoping someone can clear it up.
Let's assume I've set a DataReader's FetchSize to 1,073,741,824 (1GB) but the DB only returns 1,048,576 bytes(1MB) of data.
Now I know that the DataReader in this case can use up to 1GB of memory to store DB data, but does it actually request the 1GB of memory to be allocated or does in increase it's memory allocation on demand, much like the C++ vector?
My DB calls under normal conditions will not return more than 100 MB of data and most results are under 1MB. However, due to the number of calls that can occur at once in a multiuser enviroment, I cannot afford to have fetchsize pre-allocate the maximum possible result size for every call. Increasing FetchSize to match the size of the result set is greatly improving the performance, but we cannot dynamically determine the ideal value for each query because we are using ref cursors. Therefore we are considering setting FetchSize to a very large number.
This code is being run on VS 2008 using .Net 3.5 with ODP 10.1.
To sum it up:
Does DataReader.FetchSize represent the maximum memory that can be used by the DataReader, or does it represent the amount of memory pre-allocated to the DataReader?
Thanks

Hi,
Might help u..
Re: How to create sap directories in application server by coding.
Thanks..
Edited by: Sap Fan on Mar 2, 2009 7:51 AM

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<property name="proxiedProtocols" value="ws/tcp"/>
</http-listener>
<http-listener acceptor-threads="1" address="0.0.0.0" blocking-enabled="false" default-virtual-server="server" enabled="true" family="inet" id="http-listener-2" port="8181" security-enabled="true" server-name="" xpowered-by="true">
<ssl cert-nickname="s1as"/>
</http-listener>
<http-listener acceptor-threads="1" address="0.0.0.0" blocking-enabled="false" default-virtual-server="__asadmin" enabled="true" family="inet" id="admin-listener" port="4848" security-enabled="false" server-name="" xpowered-by="true"/>
<virtual-server hosts="${com.sun.aas.hostName}" http-listeners="http-listener-1,http-listener-2" id="server" log-file="${com.sun.aas.instanceRoot}/logs/server.log" state="on">
<property name="docroot" value="${com.sun.aas.instanceRoot}/docroot"/>
<property name="accesslog" value="${com.sun.aas.instanceRoot}/logs/access"/>
<property name="sso-enabled" value="false"/>
</virtual-server>
<virtual-server hosts="${com.sun.aas.hostName}" http-listeners="admin-listener" id="__asadmin" log-file="${com.sun.aas.instanceRoot}/logs/server.log" state="on">
<property name="docroot" value="${com.sun.aas.instanceRoot}/docroot"/>
<property name="accesslog" value="${com.sun.aas.instanceRoot}/logs/access"/>
<property name="sso-enabled" value="false"/>
</virtual-server>
<request-processing header-buffer-length-in-bytes="8192" initial-thread-count="2" request-timeout-in-seconds="30" thread-count="5" thread-increment="1"/>
<keep-alive max-connections="250" thread-count="1" timeout-in-seconds="30"/>
<connection-pool max-pending-count="4096" queue-size-in-bytes="4096" receive-buffer-size-in-bytes="4096" send-buffer-size-in-bytes="8192"/>
<http-protocol default-response-type="AttributeDeprecated" default-type="text/html; charset=iso-8859-1" dns-lookup-enabled="false" forced-response-type="AttributeDeprecated" forced-type="text/html; charset=iso-8859-1" ssl-enabled="true" version="HTTP/1.1"/>
<http-file-cache file-caching-enabled="false" file-transmission-enabled="false" globally-enabled="false" hash-init-size="0" max-age-in-seconds="30" max-files-count="1024" medium-file-size-limit-in-bytes="537600" medium-file-space-in-bytes="10485760" small-file-size-limit-in-bytes="2048" small-file-space-in-bytes="1048576"/>
<property name="accessLoggingEnabled" value="false"/>
</http-service>
<iiop-service client-authentication-required="false">
<orb max-connections="1024" message-fragment-size="1024" use-thread-pool-ids="thread-pool-1"/>
<iiop-listener address="0.0.0.0" enabled="true" id="orb-listener-1" port="3700" security-enabled="false"/>
<iiop-listener address="0.0.0.0" enabled="true" id="SSL" port="3820" security-enabled="true">
<ssl cert-nickname="s1as" client-auth-enabled="false" ssl2-enabled="false" ssl3-enabled="true" tls-enabled="true" tls-rollback-enabled="true"/>
</iiop-listener>
<iiop-listener address="0.0.0.0" enabled="true" id="SSL_MUTUALAUTH" port="3920" security-enabled="true">
<ssl cert-nickname="s1as" client-auth-enabled="true" ssl2-enabled="false" ssl3-enabled="true" tls-enabled="true" tls-rollback-enabled="true"/>
</iiop-listener>
</iiop-service>
<admin-service system-jmx-connector-name="system" type="das-and-server">

<jmx-connector accept-all="false" address="0.0.0.0" auth-realm-name="admin-realm" enabled="true" name="system" port="8686" protocol="rmi_jrmp" security-enabled="false">
<ssl cert-nickname="s1as"/>
</jmx-connector>

<das-config admin-session-timeout-in-minutes="60" autodeploy-dir="${com.sun.aas.instanceRoot}/autodeploy" autodeploy-enabled="true" autodeploy-jsp-precompilation-enabled="false" autodeploy-polling-interval-in-seconds="2" autodeploy-verifier-enabled="false" deploy-xml-validation="full" dynamic-reload-enabled="true" dynamic-reload-poll-interval-in-seconds="2"/>
</admin-service>
<web-container>
<session-config>
<session-manager>
<manager-properties/>
<store-properties/>
</session-manager>
<session-properties/>
</session-config>
</web-container>
<ejb-container cache-idle-timeout-in-seconds="600" cache-resize-quantity="32" commit-option="B" max-cache-size="512" max-pool-size="32" pool-idle-timeout-in-seconds="600" pool-resize-quantity="8" removal-timeout-in-seconds="5400" session-store="${com.sun.aas.instanceRoot}/session-store" steady-pool-size="0" victim-selection-policy="nru">
<ejb-timer-service max-redeliveries="1" minimum-delivery-interval-in-millis="7000" redelivery-interval-internal-in-millis="5000"/>
</ejb-container>
<mdb-container idle-timeout-in-seconds="600" max-pool-size="32" pool-resize-quantity="8" steady-pool-size="0"/>
<jms-service addresslist-behavior="random" addresslist-iterations="3" default-jms-host="default_JMS_host" init-timeout-in-seconds="60" reconnect-attempts="3" reconnect-enabled="true" reconnect-interval-in-seconds="5" type="EMBEDDED">
<jms-host admin-password="admin" admin-user-name="admin" host="USER2" name="default_JMS_host" port="7676"/>
</jms-service>
<log-service alarms="false" file="${com.sun.aas.instanceRoot}/logs/server.log" log-rotation-limit-in-bytes="2000000" log-rotation-timelimit-in-minutes="0" log-to-console="false" retain-error-statistics-for-hours="5" use-system-logging="false">
<module-log-levels admin="INFO" classloader="INFO" cmp="INFO" cmp-container="INFO" configuration="INFO" connector="INFO" corba="INFO" deployment="INFO" ejb-container="INFO" group-management-service="INFO" javamail="INFO" jaxr="INFO" jaxrpc="INFO" jdo="INFO" jms="INFO" jta="INFO" jts="INFO" management-event="INFO" mdb-container="INFO" naming="INFO" node-agent="INFO" resource-adapter="INFO" root="INFO" saaj="INFO" security="INFO" self-management="INFO" server="INFO" synchronization="INFO" util="INFO" verifier="INFO" web-container="INFO"/>
</log-service>
<security-service activate-default-principal-to-role-mapping="false" anonymous-role="AttributeDeprecated" audit-enabled="false" audit-modules="default" default-realm="file" jacc="default">

<auth-realm classname="com.sun.enterprise.security.auth.realm.file.FileRealm" name="admin-realm">
<property name="file" value="${com.sun.aas.instanceRoot}/config/admin-keyfile"/>
<property name="jaas-context" value="fileRealm"/>
</auth-realm>

<auth-realm classname="com.sun.enterprise.security.auth.realm.file.FileRealm" name="file">
<property name="file" value="${com.sun.aas.instanceRoot}/config/keyfile"/>
<property name="jaas-context" value="fileRealm"/>
</auth-realm>
<auth-realm classname="com.sun.enterprise.security.auth.realm.certificate.CertificateRealm" name="certificate">
</auth-realm>
<jacc-provider name="default" policy-configuration-factory-provider="com.sun.enterprise.security.provider.PolicyConfigurationFactoryImpl" policy-provider="com.sun.enterprise.security.provider.PolicyWrapper">
<property name="repository" value="${com.sun.aas.instanceRoot}/generated/policy"/>
</jacc-provider>
<audit-module classname="com.sun.enterprise.security.Audit" name="default">
     <property name="auditOn" value="false"/>
</audit-module>
<message-security-config auth-layer="SOAP">
     
<provider-config class-name="com.sun.xml.wss.provider.ClientSecurityAuthModule" provider-id="XWS_ClientProvider" provider-type="client">
     <request-policy auth-source="content"/>
     <response-policy auth-source="content"/>
     <property name="encryption.key.alias" value="s1as"/>
     <property name="signature.key.alias" value="s1as"/>
     <property name="dynamic.username.password" value="false"/>
     <property name="debug" value="false"/>
</provider-config>
<provider-config class-name="com.sun.xml.wss.provider.ClientSecurityAuthModule" provider-id="ClientProvider" provider-type="client">
     <request-policy auth-source="content"/>
     <response-policy auth-source="content"/>
     <property name="encryption.key.alias" value="s1as"/>
     <property name="signature.key.alias" value="s1as"/>
     <property name="dynamic.username.password" value="false"/>
     <property name="debug" value="false"/>
     <property name="security.config" value="${com.sun.aas.instanceRoot}/config/wss-server-config-1.0.xml"/>
</provider-config>
<provider-config class-name="com.sun.xml.wss.provider.ServerSecurityAuthModule" provider-id="XWS_ServerProvider" provider-type="server">
     <request-policy auth-source="content"/>
     <response-policy auth-source="content"/>
     <property name="encryption.key.alias" value="s1as"/>
     <property name="signature.key.alias" value="s1as"/>
     <property name="debug" value="false"/>
</provider-config>
<provider-config class-name="com.sun.xml.wss.provider.ServerSecurityAuthModule" provider-id="ServerProvider" provider-type="server">
     <request-policy auth-source="content"/>
     <response-policy auth-source="content"/>
     <property name="encryption.key.alias" value="s1as"/>
     <property name="signature.key.alias" value="s1as"/>
     <property name="debug" value="false"/>
     <property name="security.config" value="${com.sun.aas.instanceRoot}/config/wss-server-config-1.0.xml"/>
</provider-config>
</message-security-config>
</security-service>
<transaction-service automatic-recovery="false" heuristic-decision="rollback" keypoint-interval="65536" retry-timeout-in-seconds="600" timeout-in-seconds="0" tx-log-dir="${com.sun.aas.instanceRoot}/logs"/>
<monitoring-service>
     <module-monitoring-levels connector-connection-pool="OFF" connector-service="OFF" ejb-container="OFF" http-service="OFF" jdbc-connection-pool="OFF" jms-service="OFF" jvm="OFF" orb="OFF" thread-pool="OFF" transaction-service="OFF" web-container="OFF"/>
</monitoring-service>
<diagnostic-service capture-app-dd="true" capture-hadb-info="true" capture-install-log="true" capture-system-info="true" compute-checksum="true" max-log-entries="500" min-log-level="INFO" verify-config="true"/>
<java-config classpath-suffix="" debug-enabled="false" debug-options="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=9009" env-classpath-ignored="true" java-home="${com.sun.aas.javaRoot}" javac-options="-g" rmic-options="-iiop -poa -alwaysgenerate -keepgenerated -g" system-classpath="">

<jvm-options>-XX:MaxPermSize=192m</jvm-options>
<jvm-options>-client</jvm-options>
<jvm-options>-Djava.endorsed.dirs=${com.sun.aas.installRoot}/lib/endorsed</jvm-options>
<jvm-options>-Djava.security.policy=${com.sun.aas.instanceRoot}/config/server.policy</jvm-options>
<jvm-options>-Djava.security.auth.login.config=${com.sun.aas.instanceRoot}/config/login.conf</jvm-options>
<jvm-options>-Dsun.rmi.dgc.server.gcInterval=3600000</jvm-options>
<jvm-options>-Dsun.rmi.dgc.client.gcInterval=3600000</jvm-options>
<jvm-options>-Xmx512m</jvm-options>
<jvm-options>-Djavax.net.ssl.keyStore=${com.sun.aas.instanceRoot}/config/keystore.jks</jvm-options>
<jvm-options>-Djavax.net.ssl.trustStore=${com.sun.aas.instanceRoot}/config/cacerts.jks</jvm-options>
<jvm-options>-Djava.ext.dirs=${com.sun.aas.javaRoot}/lib/ext${path.separator}${com.sun.aas.javaRoot}/jre/lib/ext${path.separator}${com.sun.aas.instanceRoot}/lib/ext${path.separator}${com.sun.aas.derbyRoot}/lib</jvm-options>
<jvm-options>-Djdbc.drivers=org.apache.derby.jdbc.ClientDriver</jvm-options>
<jvm-options>-Djavax.management.builder.initial=com.sun.enterprise.admin.server.core.jmx.AppServerMBeanServerBuilder</jvm-options>
<jvm-options>-Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.config.serverbeans.AppserverConfigEnvironmentFactory</jvm-options>
<jvm-options>-Dcom.sun.enterprise.taglibs=appserv-jstl.jar,jsf-impl.jar</jvm-options>
<jvm-options>-Dcom.sun.enterprise.taglisteners=jsf-impl.jar</jvm-options>
<jvm-options>-XX:NewRatio=2</jvm-options>
</java-config>
<thread-pools>
<thread-pool idle-thread-timeout-in-seconds="120" max-thread-pool-size="200" min-thread-pool-size="0" num-work-queues="1" thread-pool-id="thread-pool-1"/>
</thread-pools>
<management-rules enabled="true">
</management-rules>
</config> 
</configs>
<servers>
<server config-ref="server-config" lb-weight="100" name="server">
<application-ref disable-timeout-in-minutes="30" enabled="true" lb-enabled="false" ref="adminapp" virtual-servers="__asadmin"/>
<application-ref disable-timeout-in-minutes="30" enabled="true" lb-enabled="false" ref="admingui" virtual-servers="__asadmin"/>
<application-ref disable-timeout-in-minutes="30" enabled="true" lb-enabled="false" ref="JBIFramework"/>
<application-ref disable-timeout-in-minutes="30" enabled="true" lb-enabled="false" ref="WSTXServices"/>
<application-ref disable-timeout-in-minutes="30" enabled="true" lb-enabled="false" ref="WSTCPConnectorLCModule"/>
<resource-ref enabled="true" ref="jdbc/__TimerPool"/>
<resource-ref enabled="true" ref="jdbc/__CallFlowPool"/>
<resource-ref enabled="true" ref="jdbc/__default"/>
<resource-ref enabled="true" ref="jdbc/sample"/>
</server>
</servers>
<property name="administrative.domain.name" value="domain1"/>
</domain>
PLEASE HELP
Edited by: cokskiblue on Feb 9, 2008 8:33 PM

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