asp.net data matrix reader

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Loosely coupled code allows the major dependencies to be supplied from external code. Again, I ll give a simple example of a class that has a loose coupling with its dependency (see Listing 3-2).

A data context does what an ADO.NET connection does, but it also does things that a data provider handles. It not only manages the connection to a data source but it translates LINQ requests (expressed in SQO) into SQL, passes the SQL to the database server, and creates objects from the result set.

first_rows: Deprecated in 9i, but maintained for backward compatibility The optimizer will attempt to find an execution plan to return the first row of a result set as rapidly as possible There are several high-level constraints built into the code For example, one constraint appears to be avoid merge joins and hash joins unless the alternative is a nested loop with a full tablescan on the inner (second) table The rules tend to push the optimizer into using indexed access paths, which are occasionally very inappropriate access paths An example of and workaround to this particular issue can be found in the script first_rowssql in the online code suite for this chapter, available from the Apress web site (wwwapresscom) or from the author s web site (wwwjlcompdemoncouk) There are two other options for the optimizer_mode (even in 10g): rule and choose.

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As an alternative to setting the root password, you can simply type the following whenever you want to switch to the root user account:

name,ethernetid hax.lbc,00:50:56:c0:00:08 helyx.lbc,00:50:56:c0:00:01

public POP3Connection(String hostname, String username, String password) { // try to connect to the server with the supplied username // and password. _hostname = hostname; _username = username; _password = password; try { Connect(); } catch (Exception e) { try { Disconnect(); } catch (Exception ex) {/* ignore */} throw e; } } private void Connect() { // initialize the list of messages _msgs = new Hashtable(); // open the connection _pop3Connection = new TcpClient(_hostname,110); _pop3Stream = _pop3Connection.GetStream(); _pop3Response = new StreamReader(_pop3Stream); // ignore first line (server's greeting) String response = _pop3Response.ReadLine(); // authenticate SendCommand("USER " + _username,true); SendCommand("PASS " + _password,true); // retrieve the list of messages SendCommand("LIST",true); response = _pop3Response.ReadLine(); while (response != ".") { // add entries to _msgs dictionary int pos = response.IndexOf(" ");

This book is going to ignore rule based optimization (RBO) completely because it has been deprecated for years and was finally desupported in 10g (even though some of the internal SQL still uses the /*+ rule */ hint) As for the choose option, this gave the optimizer a run-time choice between rule based optimization and all_rows Since I am ignoring rule based optimization, nothing more needs to be said about choose mode I will just mention that in 10g, if you use the Database Configuration Assistant (DBCA) to build a database, or call catprocsql during a manual creation, you will automatically install a job (created by the catmwinsql script and visible in view dba_scheduler_jobs) that will, every 24 hours, generate statistics on any tables with missing or stale statistics.

At the center of the IDE screen you ll see the Source and Design window. If you are viewing an ASPX file and you select the Source tab at the bottom, the window will look like Figure 2-18.

Compile and run the application. Don t forget to pass a parameter in the URL:

So, if you set the optimizer_mode to choose, it will probably result in all_rows optimization, but you may find that any tables that missed the most recent pass of statistics generation will then be subject to dynamic sampling This is because the default value in 10g for the parameter optimizer_dynamic_sampling is 2 (which means use dynamic sampling on any table without statistics), rather than 1, as it was in 9i Another parameter associated with the optimizer_mode is optimizer_goal There seems to be no difference between these two parameters as far as optimization strategies go, although the optimizer_goal can only be set dynamically within a session, and is not available in the spfile (initora)..

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