birt code 39

birt code 39

birt code 39

pdf c# control tiff using, pdf asp.net control file using, pdf c# convert image thumbnail, pdf code form library ocr, pdf add c# existing text,

birt barcode4j, birt barcode plugin, birt code 128, birt code 128, birt code 39, birt code 39, birt data matrix, birt data matrix, birt gs1 128, birt ean 128, birt ean 13, birt pdf 417, birt qr code download, birt upc-a

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

One of the most difficult processes of failing over when using either log shipping or replication involves application connections. Applications must be redirected to the secondary server to continue processing. Database Mirroring can avoid this necessity under a very particular configuration. The new version of Microsoft Data Access Components (MDAC) that ships with Microsoft Visual Studio 2005 contains a Database Mirroring related feature within the connection object called Transparent Client Redirect. When a client makes a con nection to a principal, the connection object caches the principal as well as the mirror. This caching is transparent to the application, and developers do not need to write any code to implement this functionality. If a Database Mirroring session failed over while an application were connected, the connection would be broken, and the connection object would send an error back to the client. The client would then just need to reconnect; the connection cache within MDAC would automatically redirect the connection to the mirror server. The applica tion would think it was connecting to the same server to which it was originally con nected, when in fact it is connected to a different server.

2

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns the same row as above, still with the value 1 for the Col2 column. It does not return the row inserted by connection 2. */

The mirror database within a Database Mirroring session is in a constantly recovering state and is inaccessible to users. However, you can create a Database Snapshot against a mirror database that provides point-in-time, read-only access. An example of creating a Database Snapshot is as follows:

'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\AdventureWorks_data.ds' )

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Now returns both rows, including the row inserted by connection 2. The first row now includes the updated value of the Col2 column. */ UPDATE Test.TestTran SET Col2 = Col2 + 1 WHERE Col1 = 1; /* Does not encounter an update conflict. Rather, it updates both rows' Col2 column and sets it to the values 3 and 11. */ SELECT * FROM Test.TestTran WHERE Col1 = 1; COMMIT TRAN; -- Drop the table used in this example. DROP TABLE Test.TestTran;

AS SNAPSHOT OF AdventureWorks;

A fill factor other than 0 reduces the requirement to split pages as the index grows, but it requires more storage space and can decrease read performance. Typically, database reads outnumber database writes by a factor of 5 through 10. Therefore, specifying a low fill factor that increases the number of reads can dramatically affect database performance. If, however, a table is write-intensive, a high number of queries run against it, and it becomes fragmented shortly after it is rebuilt, you should consider rebuilding the table indexes with a lower fill factor for example 75 percent.

COMMIT TRAN;

By creating Database Snapshots against a mirror database, you can leverage Database Mirroring to scale reporting activity.

9

The difference in behavior between snapshot isolation and read committed snapshot is an important part of this exam.

1. What are the three Database Mirroring roles and what functions do they serve 2. What are the three operating modes for Database Mirroring 3. Which mode is not recommended for normal operations

The pad index specifies the space left free on each page in the intermediate levels of an index. Pad index is disabled unless you specify a fill factor. If you set the PAD_INDEX option of CREATE INDEX to ON, SQL Server applies the percentage of free space you specify by the FILLFACTOR option to the intermediate-level pages of the index. If you set the PAD_INDEX option to OFF, SQL Server fills the intermediate-level pages of the index to near capacity, leaving sufficient space for at least one row of the maximum size the index can have. If the specified fill factor does not allow sufficient space for one row, the database engine overrides the fill factor percentage to allow this space. The number of rows on an intermediate index page is never fewer than two, regardless of the fill factor value. You should consider using the FILLFACTOR and PAD_INDEX options on tables that experience high levels of updates on indexed columns. Otherwise, extensive index updates can cause the intermediate index pages to split frequently, resulting in unnecessary overhead. If, however, your tables do not experience a lot of update activity, do not enable pad index. Leaving unnecessary free space on your intermediate pages results in an increased number of pages and increased disk I/O when SQL Server reads these pages. As with the fill factor, you specify the pad index setting when you create or rebuild the index.