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Listing 20-18. An Abbreviated ADDM Report DETAILED ADDM REPORT FOR TASK 'TASK_1493' WITH ID 1493 ------------------------------------------------------------------------Analysis Period: 22-JUL-2008 from 07:01:02 to 17:00:36 Database ID/Instance: 877170026/1 Database/Instance Names: NINA/nina Host Name: finance1 Database Version: 10.2.0.0 Snapshot Range: from 930 to 940 Database Time: 801313 seconds Average Database Load: 22.3 active sessions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FINDING 1: 24% impact (193288 seconds) -------------------------------------The buffer cache was undersized causing significant additional read I/O. RECOMMENDATION 1: DB Configuration, 24% benefit (193288 seconds) ACTION: Increase SGA target size by increasing the value of parameter "sga_target" by 1232 M. SYMPTOMS THAT LED TO THE FINDING: Wait class "User I/O" was consuming significant database time. (54% impact [436541 seconds]) FINDING 2: 19% impact (150807 seconds) -------------------------------------SQL statements consuming significant database time were found. RECOMMENDATION 1: SQL Tuning, 4.4% benefit (34936 seconds) ACTION: Run SQL Tuning Advisor on the SQL statement with SQL_ID "b3bkjk3ybcp5p". RELEVANT OBJECT: SQL statement with SQL_ID b3bkjk3ybcp5p and PLAN_HASH 954860671 . . . ADDM may sometimes recommend that you run the Segment Advisor for a certain segments, or the Automatic SQL Advisor for a specific SQL statement. See 17 for a detailed analysis of an ADDM performance report.

Each tablespace uses the default block size for the database, unless you create a tablespace with a different nonstandard block size As you ve already seen, Oracle lets you have multiple block sizes in addition to the default block size Because tablespaces ultimately consist of Oracle data blocks, this means that you can have tablespaces with different Oracle block sizes in the same database This is a great feature, and it gives you the opportunity to pick the right block size for a tablespace based on the data structure of the tables it contains The customization of the block size for a tablespace provides several benefits: Optimal disk I/O: Remember that the Oracle server has to read the table data from mechanical disks into the buffer cache area for processing.

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In 17, you learned how to use AWR reports to analyze the performance of the database during a time period encompassed by a pair of snapshots. As explained in that chapter, AWR reports are an excellent source of information for wait-related as well as other instance performance indicators. You can also use the AWR to produce reports displaying performance statistics for a single SQL statement, over a range of snapshot IDs. Listing 20-19 shows how you can get an AWR report for a particular SQL statement.

One of your primary goals as a DBA is to optimize the expensive I/O involved in reading from and writing to disk If you have tables with very long rows, you are better off with a larger block size each read will fetch more data than you d get with a smaller block size, and you ll need fewer read operations to get the same amount of data Tables with large object (LOB) data will also benefit from a very large block size On the other hand, tables with small row lengths can use a small block size as the building block for the tablespace If you have large indexes in your database, you will need a large block size for their tablespace, so that each read will fetch a larger number of index pointers.

The awrsqrpt.sql script seems to run slower than the instance-wide report-generating AWR script, awrrpt.sql, that you encountered in 17 during the introduction to AWR.

Optimal caching of data: Oracle provides separate pools for the various block sizes, and this leads to a better use of Oracle s memory I discuss this in the following sections Easier transport of tablespaces: If you have tablespaces with multiple block sizes, it s easier to use Oracle s transport tablespaces feature In 13, you ll find examples showing you how to transport tablespaces between databases..

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