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If you don t draw a selection before applying the Spherize filter, Photoshop applies the filter to the image as if the entire canvas were selected

space is allocated to segments within a tablespace) and segment space management (how rows are allocated to blocks within a segment) You are strongly advised to use locally managed tablespaces with automatic segment space management: these options are enabled by default in the current release of the database and rely on bitmaps to track extent allocation and block usage The bitmapped managed techniques are very efficient for allocating space as rows are inserted and segments grow, but UPDATE and DELETE statements can still result in problems that may make it necessary to reorganize the segments Updates can cause row migration, and deletions can result in wasted space

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A chained row is a row that is stored in more than one block This will occur when the row is bigger than the block If the block size is 4KB and the row is 5KB, there is no choice; the row will be stored in two blocks At system design time, this should have been considered: the rows are too large for the blocks This is sometimes a systems analysis problem, caused by incorrect normalization resulting in an unnecessary number of columns in the table, but it is often a design time problem Perhaps the table uses columns of type CHAR or LONG rather than VARCHAR2 or BLOB, or perhaps the table could have been sliced vertically, into two or more tables Whatever the cause, row chaining is not the DBA s problem Row migration is a different matter Most of the Oracle primitive data types have variable length, and therefore most tables have rows of variable length As rows are updated, their length may change This means that the rows will get bigger The default settings for a table segment reserve 10 percent of each block as space for rows to expand If rows are only ever inserted or deleted, then this 10 percent is in fact wasted space But if rows are subjected to updates that make them bigger, then it may not be sufficient If the 10 percent free space has already been used by previous updates and an update is made that will increase the size of another row, the entire row must be relocated to another block, where there is room for the new version of the row This is a row migration Clearly, this will impact on the performance of the UPDATE statement: it becomes in effect a DELETE and an INSERT A worse problem arises with subsequent access to the row, because the index entries are not adjusted when a row is migrated: the index keys always point to the row s original location When a row is migrated, a stub (think of it as a forwarding address) is left behind, which directs the session to the current location of the row The result is that it takes two table block reads to get the row, not one Worse still, if a row has been migrated once and is updated again, it may be migrated again And again EXAM TIP Row migration is caused by UPDATE statements INSERT and DELETE can never cause row migration Row migration should be detected and fixed by the DBA The ideal situation is to prevent it in the first place, by adjusting the table settings to reserve an appropriate amount of space for rows to expand For example, if you know that on average the PART III.

After drawing your elliptical selection, you re ready to spherize Choose Filter | Distort | Spherize To change the amount of spherization, adjust the slider negative values cause the effect to appear as if it were receding into the page To spherize along only the horizontal or vertical axis, change the Mode Click OK to apply the effect, or click Cancel to go back and edit your selection

rows of a certain table will double in size during its lifetime, the percentage of space reserved should not be 10 percent but 50 percent This can be set at table creation time, or later:

alter table <table_name> pctfree 50;

Many times the information needed to set the PCTFREE correctly is not available, so all you can do is correct the problem later The simplest method is to move the table: