c# - Getting SQL Connection fragmentation, different way to connect to DB's -

-

we have multiple db servers. on 1 of servers have master config table holds instructions db server , database name agency supposed use.

currently each database has 2 connections on them, if they're not being used (which fixing). however, we're trying find way make our connections not on place, , relieve of stress on our db servers.

after lot of research found articles saying connections central location, , change database we're using through sqlconnection object. seems bit roundabout, work.

so i'm wondering others in situation?

the current path is:

-user logs in -system access configtable find out database user going connect to. -system loads agency connection settings memory (session) user. -every request directly hits users database.

is there more efficient way of doing this?

open connections late, , close them early.

for example:

string result; using (var con = new sqlconnection(...)) {     con.open();     var com = con.createcommand();     com.commandtext = "select 'hello world'";     result = com.executescalar(); }

the windows os make sure efficiently pool , reuse connections. , since you're using connections when need them, there no idle connections lying around.

edit: windows caches connection strings literally same, if use initial catalog=<dbname> in connection string, hurt performance requiring 500+ "connection pools" 1 server.

so if have 4 servers lot of databases, make sure use 4 connection strings. after connecting, switch database with:

com.commandtext = "use <dbname>"; com.executenonquery();

or query three-part name like:

select * <dbname>.dbo.yourtable

Comments

Post a Comment

Popular posts from this blog

java - SNMP4J General Variable Binding Error -

-
i trying use snmp4j snmp bulkget. when ever use snmp4j make call returned responseevent error says "general variable binding error" , data returned equal null. to debug: print out, console, exact oid , version number using in snmp4j. use printed out data snmpwalk on command line. valid results. know sending snmp4j correct pdu correct oid, version number, max repititions, etc. i have used snmp4j , code wrote succesffuly monitor other devices years. don't know different time. leaving me stumped. why "general variable binding error?" causes error? ideas debug? can reproduced? if so, first action should using wireshark or microsoft network monitor capture network packets. my guess agent gives generr response, not surprising, http://www.ietf.org/rfc/rfc1157.txt
Read more

windows - Python Service Installation - "Could not find PythonClass entry" -

-
i working on building python service. inducing error, not sure inducing it. ps c:\...> python .\file.py debug debugging service myservice - press ctrl+c stop. error 0xc00000f4 - not find service's pythonclass entry in registry error 1814 - specified resource name cannot found in image file. error 0xc0000080 - not locate module name in python class string (ie, no '.') this error coming pythonservicemessages.mc in pythonwin32. it turns out error result caused exception being thrown , python script dying off.
Read more

Determine if a XmlNode is empty or null in C#? -

-
the following code takes xmlnode data type , populates dataset object xmlnode content. write dataset's content file. public void populatedataset(xmlnode node) { xmlnodereader reader = new xmlnodereader(node); dataset ds = new dataset(); ds.readxml(reader); system.guid guid = system.guid.newguid(); string name = string.format("{0}{1}_{2}.xml", utility.xmloutputpath, utility.xmloutputfilename, guid.tostring()); //need write "node empty" file if xmlnode object empty of null ds.writexml(name, xmlwritemode.ignoreschema); } the problem encountered 1 scenario not write content file. how determine if xmlnode object null or empty? you can check if node parameter null or has innertext or innerxml properties null or empty, when enter method before creating xmlnodereader .
Read more