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If you use a color outside of the web-safe palette and your page is viewed on a computer running 256 colors or less, your color will be changed to one that is within the available system palette So, if you want to guarantee that a particular color is going to remain constant under the largest number of situations, it s best to use a web-safe color On the other hand, if you use a color outside the web-safe palette and your page is viewed on a computer running 24-bit color, you don t have to worry because systems running in 24-bit color mode can handle millions of colors

XID START_SCN START_TIMESTAMP COMMIT_SCN COMMIT_TIMESTAMP LOGON_USER UNDO_CHANGE# OPERATION TABLE_NAME TABLE_OWNER ROW_ID UNDO_SQL The transaction identifier This is the join column to the pseudocolumn VERSIONS_XID displayed in a Flashback Versions Query The system change number at the time the transaction started The timestamp at the time the transaction started The system change number at the time the transaction was committed The timestamp at the time the transaction was committed The Oracle username of the session that performed the transaction The undo system change number This is not likely to be relevant to most work The DML operation applied to the row: INSERT, UPDATE, or DELETE The table to which the row belongs The schema to which the table belongs The unique identifier of the row affected A constructed statement that will reverse the operation For example, if the OPERATION were a DELETE, then this will be an INSERT

A one-line SQL statement might generate many rows in FLASHBACK_TRANSACTION_ QUERY This is because SQL is a set-oriented language: one statement can affect many rows But each row affected will have its own row in the view The view will show committed transactions and also transactions in progress For an active transaction, the COMMIT_SCN and COMMIT_TIMESTAMP columns are NULL Rolled-back transactions are not displayed Take an example where a salary was multiplied by eleven, rather than being incremented by ten percent:

It s best to design for the largest possible audience, because it s very likely that your site will be viewed by people using a wide variety of color modes everything from two-color, hand-held computers to high-end computers with beautiful, large-screen monitors While this chapter describes how to load the web-safe palette in Photoshop, 10 discusses when to use the web-safe palette for a particular image

Later, it is suspected that a mistake was made So query the versions of the row:

SQL> select ename,sal,versions_xid from emp versions between scn 2 minvalue and maxvalue where empno=7902; ENAME SAL VERSIONS_XID ---------- ---------- ---------------FORD 33000 06002600B0010000 FORD 3000

This does indicate what happened, and gives enough information to reverse the change But what if the transaction affected other rows in other tables To be certain, query FLASHBACK_TRANSACTION_QUERY, which will have one row for every row affected by the transaction A minor complication is that the XID column is type RAW, whereas the VERSIONS_XID pseudocolumn is hexadecimal, so you must use a type casting function to make the join:

Many people don t realize that the physical size of a computer monitor is independent of the amount of space available for the computer desktop referred to as the monitor resolution For example, you could run both a 14- and a 21-inch monitor in the 640 480 resolution if you wanted to Likewise, you could set your 17-inch monitor to run anything from a low 640 480 resolution to a high 1920 1440 resolution Figures 1-1 and 1-2 at the beginning of the chapter show how changing your monitor s resolution from one resolution to another affects the amount of space on your computer desktop These figures demonstrate how the monitor s resolution most affects Photoshop the higher your resolution, the more space you have for all those palettes and windows! To check your screen resolution, follow the steps outlined next for your operating system Once you have identified your current screen resolution, you can use the same menu to change it to a larger one as needed

SQL> select operation,undo_sql from flashback_transaction_query where xid=hextoraw('06002600B0010000'); OPERATION UNDO_SQL ---------- ----------------------------------------------------UPDATE update "SCOTT""EMP" set "SAL = '3000' where ROWID = 'AAAM+yAAEAAAAAeAAM';