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HTTP/1.1 speci cation indicates that the response is cachable if the requirement of the request method, its header elds and the response status indicate it. HTTP/1.1 de ned four new headers associated with cache operations, and these are listed in Table 3.8. By doing so, the speci cation de ned a better granularity of control over responses and requests that are cachable in order to achieve a semantic cache operation. The cache control directives are composed of the cache control request and the cache control response directives. The client uses the cache request directives listed in Table 3.9 to override the expected cache behavior. This is usually done in order to protect privacy information of the end user. The server uses the cache control response directives listed in Table 3.10 to affect cache behavior, such as to modify the expiration mechanisms of a response. The advantages of adding cache control mechanisms are obvious. Cache is capable of reducing latency, enhancing end-to-end bandwidth ef ciency, extending the caching system, and improving interactions. However, as with every design, there is a tradeoff for this architecture in that it affects reliability of the data (by assuming proper cache behavior) and in some cases privacy for the end users.

When protecting a worksheet, you can use a statement such as:

Sales revenue Variable costs [$633,715 38.9%] Contribution margin Less: Fixed costs Operating Income (before tax)

Lock Conversion If the transaction already holds a lock on a data item, it can convert the lock type from one lock mode to another There are two alternatives to lock conversion: lock upgrade and lock downgrade Lock Upgrade This happens when a transaction converts a read lock to a write lock When the write lock request is issued, the lock manager grants the upgrade if the requesting transaction is the only one holding a read lock on the data item Otherwise, the requesting transaction must wait for readers to release the locks Lock Downgrade This happens when a transaction converts a write lock to a read lock There is no issue with the downgrade since the downgrading transaction is the only transaction that is holding the lock on the data item Lock Escalation.

This happens when a transaction tries to avoid acquiring too many ne grain locks by requesting to lock a larger granule This might be requested by the transaction or may be applied automatically by the DBMS In the latter case, the DBMS can set a lock escalation threshold For example, if more row locks than indicated in the threshold are requested, the DBMS might automatically escalate the row locks to a table lock Multiple-Granularity Locking (MGL) This approach allows transactions to lock items at multiple levels of the hierarchy When a transaction locks a granule at a higher level of the hierarchy, the transaction is also given the lock to all the granules in the subtree below it The locks can be, as usual, read (shared), write (exclusive), or intention locks.

MGL is enforced by requiring the transaction that wants to lock a granule to lock the ancestor(s) of it rst For instance, if a transaction wants to lock a row of a table it must hold a lock on the table that the row is in Intention Locking This is a method in which a transaction must tell the DBMS its intention to lock before it actually locks the granule The intention (what the transaction is planning to do) is represented by an intention lock For example, a transaction may want to lock a table in the shared mode but intends on modifying some (but not all) of the rows This transaction must request a shared lock on the table with the intention to exclusively lock some of its rows Before locking a granule, a transaction must set intention locks on all its ancestors Intention Lock Modes.

The third question, how we can meet human demands without destroying freshwater ecosystems, amounts to interspecies solidarity. Its pursuit is at least as challenging as the other two. The challenges relate to:

Alternatively, you can use a comma to separate expressions in a Case statement. The following example shows another way to code the previous procedure:

There are ve intention lock modes: S: the transaction locks the entire subtree in shared (S) mode X: the transaction locks the entire subtree in exclusive (X) mode..

(11.127) (11.128)

Other measures of profitability include annual earnings per share (EPS), dividend rate per share, and book value per share. Such ratios are of most concern to those buying and selling publicly traded stock on the open market and are of less concern to the internal management of the firm. However, management is held accountable by stockholders for producing a net income satisfactory to them, and earnings per share are frequently used to measure net income. The earnings per share ratio is also important because it tends to dictate the value of the shares in the market and indicates the desirability of purchasing the stock of the company to a potential purchaser. Assume there are 40,000 shares outstanding at both the beginning and the end of the year. The EPS equation is