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It quickly becomes tedious for a programmer to write programs that explicitly check the SQLCODE value after each embedded SQL statement. To simplify error handling, embedded SQL supports the WHENEVER statement, shown in Figure 17-15. The WHENEVER statement is a directive to the SQL precompiler, not an executable statement. It tells the precompiler to automatically generate error-handling code following every executable embedded SQL statement and specifies what the generated code should do. You can use the WHENEVER statement to tell the precompiler how to handle three different exception conditions: WHENEVER SQLERROR tells the precompiler to generate code to handle errors (negative SQLCODEs). WHENEVER SQLWARNING tells the precompiler to generate code to handle warnings (positive SQLCODEs). WHENEVER NOT FOUND tells the precompiler to generate code that handles a particular warning the warning generated by the DBMS when your program tries to retrieve query results when no more are remaining. This use of the WHENEVER statement is specific to the singleton SELECT and the FETCH statements, and is described in the section Single-Row Queries later in this chapter.

Heating Even in well-lubricated sliding there will be transient heating effects at asperity interactions, and these will reduce the modulus and the yield stress at asperity interactions Boundary lubrication as a whole is not well understood, but the magnitude of its beneficial effects can be easily seen from the significant reductions in friction, wear, and seizure obtained with suitable liquid lubricants in slow metallic sliding..

Part V:

As mentioned previously, MPEG is actually a collection of standards, each suited to a particular application or group of applications, including:

In theory, if the right viscosity and the right boundary properties have been selected, then the lubrication requirements will be met. In practice, there is one further complication the oil deteriorates. Much of the technology of lubricating oils and additives is concerned with reducing or compensating for deterioration. The three important types of deterioration are oxidation, thermal decomposition, and contamination.A fourth long-term effect is reaction with other materials in the system, which is considered in terms of compatibility. Oxidation is the most important deterioration process because over a long period, even at normal atmospheric temperature, almost all lubricants show some degree of oxidation. Petroleum-base oils produced by mild refining techniques oxidize readily above 120 C to produce acidic compounds, sludges, and lacquers. The total oxygen uptake is not high, and this suggests that the trace compounds, such as aromatics and

To retrieve statement-level information and determine the number of diagnostic errors: GET DIAGNOSTICS hostvar = NUMBER MORE COMMAND_FUNCTION COMMAND_FUNCTION_CODE DYNAMIC_FUNCTION DYNAMIC_FUNCTION_CODE ROW_COUNT TRANSACTIONS_COMMITTED TRANSACTIONS_ROLLED_BACK TRANSACTIONS_ACTIVE

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

To retrieve information about an individual diagnostic error: GET DIAGNOSTICS EXCEPTION err_number hostvar CATALOG_NAME CLASS_ORIGIN COLUMN_NAME CONDITION_NUMBER CONNECTION_NAME CONSTRAINT_CATALOG CONSTRAINT_NAME CONSTRAINT_SCHEMA CURSOR_NAME MESSAGE_LENGTH MESSAGE_OCTET_LENGTH MESSAGE_TEXT PARAMETER_MODE PARAMETER_NAME PARAMETER_ORDINAL_POSITION RETURNED_SQLSTATE ROUTINE_CATALOG ROUTINE_NAME ROUTINE_SCHEMA SCHEMA_NAME SERVER_NAME SPECIFIC_NAME SUBCLASS_ORIGIN TABLE_NAME TRIGGER_CATALOG TRIGGER_NAME TRIGGER_SCHEMA

asphaltenes, are reacting, and that possibly in doing so some are acting as oxidation inhibitors for the paraffinic hydrocarbons present. Such mildly refined oils are not much improved by the addition of antioxidants. More severe refining or hydrogenation produces a more highly paraffinic oil which absorbs oxygen more readily but without producing such harmful oxidation products. More important, however, the oxidation resistance of such highly refined base oils is very considerably improved by the addition of suitable oxidation inhibitors. Most modern petroleum-base oils are highly refined in order to give consistent products with a wide operating-temperature range. Antioxidants are therefore an important part of the formulation of almost all modern mineral-oil lubricants. The commonly used antioxidants are amines, hindered phenols, organic phosphites, and organometallic compounds. One particularly important additive is zinc diethyl dithiophosphate, which is a very effective antioxidant and also has useful boundary lubrication and corrosion-inhibition properties. If no oxygen is present, lubricants can be used at much higher temperatures without breaking down. In other words, their thermal stability is greater than their oxidative stability. This effect can be seen for mineral oils in Table 20.3. To prevent contact of oxygen with the oil, the system must be sealed against the entry of air or purged with an inert gas such as nitrogen. Some critical hydraulic systems, such as those in high-speed aircraft, are operated in this way. In high-vacuum systems such as spacecraft or electron microscopes, there is no oxygen contact. But in high vacuum an increase in temperature tends to vaporize the

FIGURE 17-13

MPEG-1, the original implementation, targeted at multimedia uses The MPEG-1 algorithm is intended basically for compact disk bit rates of approximately 15 20 Megabits per second MPEG-1 supports 525- and 625-type signal structures in progressive form (ie, non-interlaced) with 204/288 lines per frame, sequential-scan frame rates of 2997 and 25 frames per second and 352 pixels per line The coding of high-motion signals does not produce particularly good results, however As might be expected, as the bit rate is reduced (compression ratio increased), the output video quality gradually declines The overall bit rate reduction ratios achievable are about 6:1 with a bit rate of 6 Megabits per second and 200:1 at 15 Megabits per second.

TABLE 20.3 Range of Temperature Limits in Degrees Celsius for Mineral Oils as a Function of Required Life

17: