By Bob Bryla
No matter if you might have very little wisdom of T-SQL, starting T-SQL 2008 will convey you as much as intermediate point and educate you most sensible practices alongside the way in which. You’ll easy methods to write code that can assist you to accomplish the best-performing functions possible.You’ll locate an advent to databases, normalization, and SQL Server administration Studio. You’ll know how facts is saved in a database and how one can use at the very least one of many to be had instruments to get to that data.Each next bankruptcy teaches a facet of T-SQL, development at the talents realized in earlier chapters. routines are incorporated in each one bankruptcy as the basically technique to study T-SQL is to jot down a few code.This ebook will do greater than simply provide the syntax and examples. it's going to educate you concepts that can assist you keep away from universal mistakes and create powerful and well-performing code.Imparts most sensible practices for writing T-SQL
Helps readers steer clear of universal errors
Shows the way to write scalable code that yields stable performance
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Extra info for OCP Oracle Database 11g Administration II Exam Guide: Exam 1Z0-053
When an Oracle instance is started, memory is allocated for the SGA based on the values specified in the initialization parameter file or hard-coded in the Oracle software. Many of the parameters that control the size of the various parts of the SGA are dynamic; however, if the parameter 12 Chapter 1: FIGURE 1-3 Database Architecture and ASM Oracle logical memory structures SGA_MAX_SIZE is specified, the total size of all SGA areas must not exceed the value of SGA_MAX_SIZE. If SGA_MAX_SIZE is not specified, but the parameter SGA_ TARGET is specified, Oracle automatically adjusts the sizes of the SGA components so that the total amount of memory allocated is equal to SGA_TARGET.
The library cache holds information about SQL and PL/SQL statements that are run against the database. In the library cache, because it is shared by all users, many different database users can potentially share the same SQL statement. Along with the SQL statement itself, the execution plan of the SQL statement is stored in the library cache. The second time an identical SQL statement is run, by the same user or a different user, the execution plan is already computed, improving the execution time of the query or DML statement.
ASM filenames can be in one of six different formats. In the sections that follow, you’ll learn about the different formats and the context in which they can be used—either as a reference to an existing file, during a single-file creation operation, or during a multiple-file creation operation. Fully Qualified Names Fully qualified ASM filenames are used only when referencing an existing file. incarnation pair ensures uniqueness. 627432977 ensures uniqueness if you decide to create another ASM datafile for the USERS tablespace.