c# - How to prevent LocalDB from detaching MDF file after some idle time? -

-

i'm building .net 4.5 (winforms) application uses localdb work local mdf file, using connection string:

data source=(localdb)\v11.0;attachdbfilename=|datadirectory|\db\databasefile.mdf;integrated security=true;multipleactiveresultsets=true

when run application, first sql query takes time execute - nothing drastic, 2 or 3 seconds. after that, next sql queries executed instantly. assume seconds during first execution needed attach mdf file local sql server service. right?

i noticed, however, if 10 minutes (or so) pass since sql query last performed, next sql query again take 2-3 seconds more execute. assume after idle time, mdf gets detached, , when new sql command called, re-attaches once again.

i'm wondering, there way override behavior?

i know create timer, performs simple query every few minutes, there better, cleaner solution?

i more suspect data / index no longer in memory.

you run fast query select 'a' know if connect time.

as forcing table / index stay in memory.
advise let .net , sql own memory management.

2-3 seconds not much.
@ query plan - maybe can make faster (even not in memory).


Comments

Post a Comment

Popular posts from this blog

java - Plugin org.apache.maven.plugins:maven-install-plugin:2.4 or one of its dependencies could not be resolved -

-
i getting error message , further 1 here: failed read artifact descriptor org.apache.maven.plugins:maven-install-plugin:jar:2.4: even though when go .m2 repository path c:\users\a591024.m2\repository\org\apache\maven\plugins\maven-resources-plugin\2.4 the maven-resources-plugin-2.4.jar file there , maven-resources-plugin-2.4.pom there. have tried delete .m2 repository no luck. far maven not build project desperately need to. any ideas? it seems proxy issue please aad following in setting.xml grabbing lan setting , proxy information. <proxies> <proxy> <id>proxy</id> <active>true</active> <protocol>http</protocol> <host>hostname</host> <port>port</port> </proxy> </proxies> this frequent issue, please see below link well. plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or 1 of dependencies not resolved maven: failed ret...
Read more

Round ImageView Android -

-
Image
i working on android application in doing rounded image view. working fine images, images 160x120 resolution shows oval shaped. code custom imageview given below, please me out here: public class roundimage extends drawable { private final bitmap mbitmap; private final paint mpaint; private final rectf mrectf; private final int mbitmapwidth; private final int mbitmapheight; public roundimage(bitmap bitmap) { mbitmap = bitmap; mrectf = new rectf(); mpaint = new paint(); mpaint.setantialias(true); mpaint.setdither(true); final bitmapshader shader = new bitmapshader(bitmap, shader.tilemode.clamp, shader.tilemode.clamp); mpaint.setshader(shader); mbitmapwidth = mbitmap.getwidth(); mbitmapheight = mbitmap.getheight(); } @override public void draw(canvas canvas) { canvas.drawoval(mrectf, mpaint); } @override protected void onboundschange(rect bound...
Read more

How can I utilize Yahoo Weather API in android -

-
Image
i want develop app using yahoo weather api android. want current , forecast weather details. i have tried different sources (e.g.: https://github.com/survivingwithandroid/weatherlib , getting error weatherlib api android , unable execute activity in android weatherlib ) , getting different errors m unable resplve. there can proper tutorial or guide! error: -17 08:50:48.961 3168-3168/com.survivingwithandroid.weather e/androidruntime﹕ fatal exception: main process: com.survivingwithandroid.weather, pid: 3168 java.lang.runtimeexception: unable start activity componentinfo{com.survivingwithandroid.weather/com.survivingwithandroid.weather.mainactivity}: java.lang.nullpointerexception: attempt invoke interface method 'boolean java.util.list.isempty()' on null object reference @ android.app.activitythread.performlaunchactivity(activitythread.java:2298) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360) @ android.app.activi...
Read more