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Using aggregate operators to form queries is closely related to the sequence expression notation described in 3 and is used frequently in this book. For example, namesSalesOver30 defined previously can also be defined as follows: seq { for (name, age, dept) in people do if age >= 30 && dept = "Sales" then yield name } This is a different notation for the same computation. For very simple queries, F# sequence expressions also support an even more compact form where if/then clauses are replaced by when, the final do is dropped from the for statement, and yield is replaced by ->: seq { for (name, age, dept) in people do if age >= 30 && dept = "Sales" then yield name } There is no difference between these two sequence expressions it s just a matter of syntax. You can use sequence expressions in conjunction with the |> operator. For example: seq { for i in numbers do if i % 2 = 0 then yield (i, i*i) } |> Seq.truncate 3 |> Seq.sort There are pros and cons to using sequence-expression syntax for some parts of queries: Sequence expressions are very good for the subset of queries expressed using iteration (for), mapping (select/yield), and filtering (if/then/when/where). They re particularly good for queries containing multiple nested for statements.
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This is a useful addition to the blog, but it could be better. It doesn t show to which story or post the comments belong. A reader might be particularly interested in what other people have to say about a story he commented on recently. A contributor might be looking for comments on her own stories. As its name implies, the Customizable Comment Listings plug-in is flexible enough to accommodate such additions. Let s replace the simple call to the plug-in function with the code shown in Listing 16-11. This is another example provided in the plug-in s documentation. Listing 16-11. New Version of the get_recent_comments Template Function in index.php <h2>< php _e('Recent Comments'); ></h2> <ul class="recentcomments"> < php c2c_get_recent_comments(5, "<li>%comment_author% said \"%comment_excerpt%\" in <br />%post_URL%</li>"); > </ul> This function looks complicated, but it has only one more parameter. It uses a very powerful format template Scott has defined. Each of the terms enclosed in percent signs (%) is substituted by some data from the list of recent comments. The substitution names are fairly
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I have included the single-table access path in the extract to show you the cost of the full tablescan (266) that Oracle used to acquire the data that was to be sorted. The last line printed shows the best cost so far as 2,777, which is the sum of 266 (the tablescan cost) and 2,511 (the Total IO sort cost). We need to understand how the optimizer derives the value 2,511 for the Total IO sort cost. Before getting into the difficult bits, I d like to explain the other numbers that appear in the second section of the output. In order: Sort width: This is the same as the max intermediate sort width we saw in the 10032 trace. Area size: This is the amount of memory available for processing the data. Our sort_area_size was 1MB, so the size reported here seems a little small. In the 8i-style calculations, the optimizer allows 10% (rounded to an exact multiple of the block size) of the sort_area_size for write buffers. This still leaves a lot missing which according to my theory is the allowance built into the model for the binary insertion tree. Subtract 10% (rounded to the next complete block) from the initial value, and then subtract 25% of the rest for the sort tree: 1,048,576 bytes = 128 blocks (at 8KB); subtract 13 blocks (10%) and you get 115 blocks; subtract 25%, and you get 86.25 blocks rounding up to the nearest block this is 87 blocks 712,704 bytes, which is what we see here. Note, however, that this 25% allowance does not change as the row size changes (which it probably ought to if my theory were correct); nor does it change as you move from 32-bit Oracle to 64-bit Oracle. Max Area size: Since this is a 9i trace file, the Area size reports the minimum allocation size available based on the setting of the pga_aggregate_target, and the Max area size reports the maximum area that the session will be allowed. Since this test case is running 8i-style, using the manual workarea size policy, the Area size and Max area size are identical. When the two values differ, the calculation of cost seems to be based on the Max area size, rather than the Area size. Degree: If you are allowing parallel execution, you will get two completely separate, identically structured sections of trace file showing the cost calculations for the sort. One will show degree 1, the other will show the degree of parallelism set for the query (which may be derived from a hint, a specific degree of parallelism on a table, or the automatic degree dictated by Oracle if you have enabled parallel automatic tuning). Blocks to Sort: A measure of the data to be sorted. Derived as Row size * Rows / block size. If you have enabled parallelism, the value for Blocks to Sort in the second (parallel) set of figures will be the value from the first (serial) set of figures divided by the degree. Row size: The optimizer s estimate of the average size of the rows to be sorted. Allowing for a couple of little adjustments and variations, this is derived from column avg_col_length of view user_tab_columns, and is usually (12 + sum(avg_col_length) + (n 1) ) (where n is the number of columns to be sorted). The fixed value 12 covers the cost of the tree node quite nicely, but the rest of the formula seems inappropriate as we have already seen that our 6 bytes of column data had a 2-byte column overhead and a 4- byte row overhead added. It s just another spot where the model for calculation doesn t quite agree with the run-time activity.
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ATTR1 ----------------------------------------------------------------------------OPT_ESTIMATE(@"SEL$1", JOIN, ("T2"@"SEL$1", "T1"@"SEL$1"), SCALE_ROWS=15) OPT_ESTIMATE(@"SEL$1", TABLE, "T2"@"SEL$1", SCALE_ROWS=200) OPTIMIZER_FEATURES_ENABLE(default) 3 rows selected. Profiles are just a set of stored hints that supply extra information to Oracle at optimization time. And, although you obviously should not do this, you can put hints like these into enduser SQL. In the following example, I have removed the double-quotes, and the query block references. (The example is not in the online suite.) select /*+ OPT_ESTIMATE(TABLE, T2, SCALE_ROWS=200) OPT_ESTIMATE(JOIN, (T2, T1), SCALE_ROWS=15) */ count(t1.v1) ct_v1, count(t2.v1) ct_v2 from t1, t2 where and and and ; t2.n2 t2.n1 t1.n2 t1.n1 = = = = 15 15 t2.n2 + 0 t2.n1 code example
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This join order starts with one of those expensive Cartesian joins, and very rapidly terminates and the related join (parent, greatgrandparent, grandparent, child) is not even considered. Join order[9]: PARENT[P]#1 GREATGRANDPARENT[GGP]#3 CHILD[C]#0 GRANDPARENT[GP]#2 Now joining: GREATGRANDPARENT[GGP]#3 ******* NL Join Outer table: cost: 631 cdn: 110 rcz: 27 resp: 631 Inner table: GREATGRANDPARENT Alias: GGP Access Path: table-scan Resc: 63 Join: Resc: 7553 Resp: 7553 Best NL cost: 7553 resp: 7553 Join Card: 28751.26 = outer (110.05) * inner (261.26) * sel (1.0000e+000) ***********************
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If the response has not yet been committed, the portlet can reset the response, or just the content in the buffer. The reset() method throws away any response properties and the content in the response s buffer. If the portlet would like to keep the properties and just remove the content, it can use the resetBuffer() method.
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2000, you can download SQLXML 3.0. Though the overall concepts that you learn in this chapter are applicable to SQL Server 2000, there are some differences between these two versions.
Figure 10 6. Proxy server network configuration
The first line of an .aspx file usually contains special markup embedded inside <%@ ... %> ... %> containing a number of ASP.NET directives. These are instructions given to the processing environment, indicating, among other things, which scripting language is used. Table 14-4 explains the most important directives and some of their attributes. Table 14-4. Some ASP.NET Directives and Their Attributes
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