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In brief, and in the order they are most likely to concern a DBA, these segments types are TABLE These are heap-structured tables that contain rows of data Even though a typical segment is a table segment, never forget that the table is not the same as the segment, and that there are more complex table organizations that use other segment types INDEX Indexes are sorted lists of key values, each with a pointer, the ROWID, to the physical location of the row The ROWID specifies which Oracle block of which datafile the row is in, and the row number within the block TYPE2 UNDO These are the undo segments (no one refers to them as type2 undo segments) that store the pre-change versions of data that are necessary for providing transactional integrity: rollback, read consistency, and isolation ROLLBACK Rollback segments should not be used in normal running from release 9i onward Release 9i introduced automatic undo management, which is based on undo segments There will always be one rollback segment that protects the transactions used to create a database (this is necessary because at that point no undo segments exist), but it shouldn t be used subsequently TABLE PARTITION A table can be divided into many partitions If this is done, the partitions will be individual segments, and the partitioned table itself will not be a segment at all: it will exist only as the sum total of its partitions Each table partition of a heap table is itself structured as a heap table, in its own segment These segments can be in different tablespaces, meaning that it becomes possible to spread one table across multiple tablespaces INDEX PARTITION An index will by default be in one segment, but indexes can also be partitioned If you are partitioning your tables, you will usually partition the indexes on those tables as well.

LOBSEGMENT, LOBINDEX, LOB PARTITION If a column is defined as a large object data type, then only a pointer is stored in the table itself: a pointer to an entry in a separate segment where the column data actually resides LOBs can have indexes built on them for rapid access to data within the objects, and LOBs can also be partitioned CLUSTER A cluster is a segment that can contain several tables In contrast with partitioning, which lets you spread one table across many segments, clustering lets you denormalize many tables into one segment NESTED TABLE If a column of a table is defined as a user-defined object type that itself has columns, then the column can be stored in its own segment, as a nested table Every segment is comprised of one or more extents When a segment is created, Oracle will allocate an initial extent to it in whatever tablespace is specified Eventually, as data is entered, that extent will fill Oracle will then allocate a second extent, in the same tablespace but not necessarily in the same datafile If you know that a segment is going to need more space, you can manually allocate an extent Figure 5-2 shows how to identify precisely the location of a segment In the figure, the first command creates the table HRNEWTAB, relying completely on defaults for the storage Then a query against DBA_EXTENTS shows that the

Figure 5-2

To adjust tones using levels, select Image | Adjustments | Levels or press CTRL-L (Windows) or CMD-L (Mac) This launches the Levels dialog box, which opens showing what s referred to as an image s histogram Drag the black slider to the edge of the first group of pixels on the left side of the histogram to increase the darkness of the shadow Drag the white slider to the edge of the first group of pixels on the right side of the histogram to increase the lightness of the highlights Drag the gray slider back and forth between the black and white sliders to alter the intensity of the midtones until you are satisfied with the outcome Click OK when you are satisfied with the alterations

Exam Readiness Checklist: Exams 1Z0-051, 1Z0-052, and 1Z0-053

051 0511 05111 05112 0512 05121 05122 05123 0513 05131 05132 0514 05141 05142 05143 0515 05151 05152 05153 05154 0516 05161 05162 05163 05164 0517 05171 05172 05173 05174

Oracle Database 11g: SQL Fundamentals I Retrieving Data Using the SQL SELECT Statement List the capabilities of SQL SELECT statements Execute a basic SELECT statement Restricting and Sorting Data Limit the rows that are retrieved by a query Sort the rows that are retrieved by a query Use ampersand substitution to restrict and sort output at runtime Using Single-Row Functions to Customize Output Describe various types of functions available in SQL Use character, number, and date functions in SELECT statements Using Conversion Functions and Conditional Expressions Describe various types of conversion functions that are available in SQL Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions Apply conditional expressions in a SELECT statement Reporting Aggregated Data Using the Group Functions Identify the available group functions Describe the use of group functions Group data by using the GROUP BY clause Include or exclude grouped rows by using the HAVING clause Displaying Data from Multiple Tables Write SELECT statements to access data from more than one table using equijoins and nonequijoins Join a table to itself by using a self-join View data that generally does not meet a join condition by using outer joins Generate a Cartesian product of all rows from two or more tables Using Subqueries to Solve Queries Define subqueries Describe the types of problems that the subqueries can solve List the types of subqueries Write single-row and multiple-row subqueries 13 13 13 13 12 12 12 12 11 11 11 11 10 10 10 10 10 9 9 9 9 9