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NTP authentication in Unix/Linux environments can be configured from the command line, or the xntpd/ntpd daemon can be started with the k switch to read the contents of the ntp.keys file. The NTP authentication procedure requires a combination of a key and a key identifier. Additionally, the key identifiers must be flagged as trusted in order for them to be usable in time synchronization exchanges. The structure of the ntp.keys file as shown in Listing 5-10 consists of multiple lines that include three fields on each line: key identifier or key number, key type, and actual key. The key number or identifier is a positive integer in the range from 1 to 2 * 32 1. Each entry in the ntp.key file must have a unique key number that s associated with the actual secret key. When NTP version 3 was originally specified in 1992, it supported the Data Encryption Standard (DES) for the purpose of cryptographic authentication among clients, servers, and peers. DES has since been replaced by the Message Digest 5 (MD5) algorithm. While it s still possible to find NTP implementations that support both DES and MD5 algorithms, support for MD5 has become more common. Consequently, even though the ntp.keys file has a key type field to support different key formats (ASCII and hexadecimal, via designations of S, N, and A) and through the key type field also to identify the authentication algorithm that would be used, expect most ntp.keys files to have the key type field of M for MD5 and the actual key specified in ASCII format, as shown in Listing 5-10.

Oracle replaces the literal values with bind values to make the statements identical The CURSOR_SHARING=FORCE option forces the use of bind variables under all circumstances, whereas the CURSOR SHARING=SIMILAR option does so only when Oracle thinks doing so won t adversely affect optimization Oracle recommends the use of CURSOR_SHARING=SIMILAR rather than CURSOR_SHARING=FORCE because of possible deterioration in the execution plans However, in reality, the benefits provided by the CURSOR_SHARING=FORCE parameter far outweigh any possible damage to the execution plans You can improve the performance of your database dramatically when you notice a high degree of hard parsing due to failing to use bind variables by moving from the default CURSOR_SHARING=EXACT option to the CURSOR_SHARING=FORCE option You can change the value of this parameter in the initora file or SPFILE, or you can do so dynamically by using the ALTER SYSTEM (instance-wide) statement or the ALTER SESSION (session-level) statement.

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By allowing users to share statements that differ only in the value of the constants, the CURSOR_ SHARING parameter enables the Oracle database to scale easily to a large number of users who are using similar, but not identical, SQL statements This major innovation started in the Oracle8i version..

The query in Listing 20-3 enables you to find out how the hard parses compare with the number of executions since the instance was started. It also tells you the session ID for the user using the SQL statements.

Table 8-1. Comparing Elapsed Times (in Hundredths of Seconds) and Latches for Relational Solution, Nested Table Based Solution, And Object View Based Solution for Insert, Update, and Delete

Listing 20-3. Determining Sessions with a High Number of Parses SQL> 2 3 4 5 6 7 8 9 10* SELECT s.sid, s.value "Hard Parses", t.value "Executions Count" FROM v$sesstat s, v$sesstat t WHERE s.sid=t.sid AND s.statistic#=(select statistic# FROM v$statname where name='parse count (hard)') AND t.statistic#=(select statistic# FROM v$statname where name='execute count') AND s.value>0 ORDER BY 2 desc; Hard Parses ----------70750 12188 3555 3265 1579 Executions Count ---------------3638104 262881 5895488 2758185 2389953

By default, cursors can be deallocated even when the application cursors aren t closed. This forces an increase in Oracle s overhead because of the need to check whether the cursor is flushed from the library cache. The parameter that controls whether this deallocation of cursors takes place is the CURSOR_SPACE_FOR_TIME initialization parameter, whose default value is FALSE. If you set this parameter to TRUE, you ensure that the cursors for the application cannot be deallocated while the application cursors are still open. The initialization parameter in the init.ora file should be as follows: CURSOR_SPACE_FOR_TIME=TRUE

If you want to set this parameter, make sure that you have plenty of free shared pool memory available, because this parameter will use more shared pool memory for saving the cursors in the library cache.

171 (1.00) 215 (1.05) 380 (1.00) 61 (1.00)

Ideally, an application should have all the parsed statements available in separate cursors, so that if it has to execute a new statement, all it has to do is pick the parsed statement and change the value of the variables. If the application reuses a single cursor with different SQL statements, it still has to pay the cost of a soft parse. After opening a cursor for the first time, Oracle will parse the statement, and then it can reuse this parsed version in the future. This is a much better strategy than re-creating the cursor each time the database executes the same SQL statement. If you can cache all the cursors, you ll retain the server-side context, even when clients close the cursors or reuse them for new SQL statements. You ll appreciate the usefulness of the SESSION_CACHED_CURSORS parameter in a situation where users repeatedly parse the same statements, as happens in an Oracle Forms-based application when users switch among various forms. Using the SESSION_CACHED_CURSORS parameter ensures that for

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