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The level of statistics gathered is controlled by the instance parameter STATISTICS_ LEVEL This can be set to BASIC, or to TYPICAL (which is the default), or to ALL The TYPICAL level will force the collection of all the statistics that are needed for normal tuning, without collecting any whose collection would impact adversely on performance The BASIC level will disable virtually all statistics, with no appreciable performance benefit The ALL level will collect extremely detailed statistics on SQL statement execution; these may occasionally be necessary if you are doing advanced SQL statement tuning, but they may cause a slight performance drop while being collected Statistics are accumulated in memory, in data structures within the SGA This causes no performance impact, because the statistics merely reflect what the instance is doing anyway Periodically (by default, once an hour) they are flushed to disk, to the AWR This is known as an AWR snapshot The flushing to disk is done by a background process: the Manageability Monitor, or MMON This use of a background process is the key to the efficiency of the statistics collection process In earlier releases of the database, accessing performance tuning statistics was only possible by running queries against various views the dynamic performance V$ views Populating these views was an expensive process The DBA had to launch a session against the database and then issue a query The query forced Oracle to extract data from the SGA and present it to the session in a view This approach is still possible all the old views, and many more, are still available but the AWR approach is far more efficient TIP No third-party tool can ever have the direct memory access to the instance that MMON has If your instance is highly stressed, you should think carefully before using any tuning products other than those provided by Oracle.

The MMON has direct access to the memory structures that make up the SGA, and therefore the statistics within them It can extract data from the SGA without the need to go via a session The only overhead is the actual writing of the snapshot of the data to the AWR By default this occurs only once an hour and should not therefore have a noticeable effect on runtime performance EXAM TIP AWR statistics are saved as a snapshot to the AWR by the MMON process, by default every 60 minutes By default, the snapshots are stored for eight days before being overwritten The AWR is a set of tables located in the SYSAUX tablespace these tables cannot be relocated They exist in the SYSMAN schema You can log on to the database with tools such as SQL*Plus as user SYSMAN, but this should never be necessary, and indeed Oracle Corporation does not support access to the AWR tables with SQL*Plus, or with any tools other than the various APIs provided in the form of DBMS packages or through various views The most straightforward way to access AWR information is through Enterprise Manager; both Enterprise Manager Database Control and Enterprise Manager Grid Control log on to the database as SYSMAN, using a password that is encrypted in their configuration files This is why changing the SYSMAN password requires more than executing an ALTER USER SYSMAN IDENTIFIED BY command; in addition to this, you must also use the EMCTL utility:

which will update the encrypted password in the appropriate file An AWR snapshot can be thought of as a copy of the contents of many V$ views at the time the snapshot was taken, but never forget that the mechanism for copying the information is not to query the V$ views: the information is extracted directly from the data structures that make up the instance The process that makes the copy is MMON In addition to information from the dynamic performance views, the AWR stores information otherwise visible in the DBA views, populated from the data dictionary This category of information includes a history of object statistics Without the AWR, the database would have no long-term record of how objects were changing The statistics gathered with DBMS_STATS provide current information, but it may also be necessary to have a historical picture of the state of the database objects The AWR can provide this

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Qu est-ce que c est comme sauce (kes-keuh say kom sos): What kind of sauce is it French cuisine is well known for its rich variety of sauces such as sauce blanche (white sauce), sauce brune (brown sauce), rouille (spicy sauce), or coulis (sweet or savory sauce) Many sauces are made with wine: sauce bourguignonne (sauce made with Burgundy), while others, such as sauce hollandaise, have a butter base If you are not familiar with a certain sauce, ask your server to explain how it is made by asking the questions: Comment c est fait (kom-mah say fay) (How s it made ) or En quoi a consiste (ah kwa sa koh-seest) (What s it made of ) If you prefer to avoid eating meals made with rich sauces, seek out restaurants that specialize in lighter fare, la nouvelle cuisine