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Use Soda PDF Editor to easily customize your PDFs with our wide array of editing tools. Edit pages, edit content, or manipulate the size and layout of your entire ... As you can see, the query used a full table scan because there are no indexes There were a total of 338 physical reads Note that the total number of rows in the courses table is 98,384 Out of this total, the courses with medicine as the course subject were 98,304 That is, the table values aren t distributed evenly among the courses at all Now let s see what happens when you use an index The following example uses a query with an index However, no statistics are collected for either the table or the index When you create an index on the courses table and run the same query, you ll see some interesting results Listing 19-9 tells the story Listing 19-9 The Execution Plan for a Query with an Index SQL> CREATE INDEX title_idx ON courses (course_title); Index created. SQL> SELECT count(*) FROM courses 2 WHERE course_subject='medicine' 3 AND course_title = 'fundamentals of human anatomy'; COUNT(*) 98304 Execution Plan -------------------------------------------------------------0 SELECT STATEMENT Optimizer=CHOOSE 1 0 SORT (AGGREGATE) 2 1 TABLE ACCESS (BY INDEX ROWID) OF 'COURSES' 3 2 INDEX (RANGE SCAN) OF 'TITLE_IDX' (NON-UNIQUE) Statistics -------------------------------------------------------------0 recursive calls 0 db block gets 1273 consistent gets 1249 physical reads 0 redo size 381 bytes sent via SQL*Net to client 499 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed SQL> After you created the index, the physical reads went from 338 to 1,249! The EXPLAIN PLAN shows that Oracle is indeed using the index, so you would expect the physical reads to be lower when compared to the no-index case. You ll be surprised how easy it is to slowly pan the frog serenade from left to right in the timeline. Here s how: What happened here is that even if a table has an index, this doesn t mean that it s always good to use it under all circumstances The CBO always figures the best way to get a query s results, with or without using the index In this case, the query has to look at almost all the rows of the table, so using an index isn t the best way to go However, you haven t collected statistics for the table and the index, so Oracle has no way of knowing the distribution of the actual data. pdf editor for mac online Delete pages from PDF document - PDF Tools - PDFResizer.com
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