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percent of values have one of the icons. You can also check the Reverse Icon Order option, to change the order in which the icons are applied. This option is useful if high numbers indicate a poor result, and you want them red, instead of green.

For that, we ll use the big_table script found in the Setting Up section in the front of this book After we have that table with its corresponding primary key index, we ll measure how many leaf blocks are in the index and how many blocks are on the FREELIST for the index Also, with an index, a block will only be on the FREELIST if the block is entirely empty, unlike a table So any blocks we see on the FREELIST are completely empty and available for reuse: ops$tkyte@ORA11GR2> select count(*) from big_table; COUNT(*) ---------500000 ops$tkyte@ORA11GR2> declare 2 l_freelist_blocks number; 3 begin 4 dbms_spacefree_blocks 5 ( segment_owner => user, 6 segment_name => 'BIG_TABLE_PK', 7 segment_type => 'INDEX', 8 freelist_group_id => 0, 9 free_blks => l_freelist_blocks ); 10 dbms_output.

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SQLite has enjoyed threading support for many releases. Although normal defensive coding techniques in multithreaded code apply to SQLite as well, there are a few additional precautions to take. One limitation that is somewhat thread-related pertains to the fork() system call on Unix. You should never try to pass a connection across a fork() call to a child process. It will not work correctly.

put_line( 'blocks on freelist = ' || l_freelist_blocks ); 11 end; 12 / blocks on freelist = 0 PL/SQL procedure successfully completed ops$tkyte@ORA11GR2> select leaf_blocks from user_indexes 2 where index_name = 'BIG_TABLE_PK'; LEAF_BLOCKS ----------1043.

Before we perform this mass deletion, we have no blocks on the FREELIST and there are 1,043 blocks in the leafs of the index, holding data Now, we ll perform the delete and measure the space utilization again: ops$tkyte@ORA11GR2> delete from big_table where id <= 250000; 250000 rows deleted ops$tkyte@ORA11GR2> commit; Commit complete ops$tkyte@ORA11GR2> declare 2 l_freelist_blocks number; 3 begin 4 dbms_spacefree_blocks 5 ( segment_owner => user, 6 segment_name => 'BIG_TABLE_PK', 7 segment_type => 'INDEX', 8 freelist_group_id => 0, 9 free_blks => l_freelist_blocks ); 10 dbms_outputput_line( 'blocks on freelist = ' || l_freelist_blocks ); 11 dbms_statsgather_index_stats 12 ( user, 'BIG_TABLE_PK' ); 13 end; 14 / blocks on freelist = 520 PL/SQL procedure successfully completed.

You re preparing a report for a sales meeting, and you d like to highlight only the bottom two results in a list of product sales. You don t want to use a color scale that will color all the selected cells, because you want the discussion to focus on only the lowest results. This example is based on the Bottom.xlsx workbook.

ops$tkyte@ORA11GR2> select leaf_blocks from user_indexes 2 where index_name = 'BIG_TABLE_PK'; LEAF_BLOCKS ----------523 As we can see, over half of the index is on the FREELIST now (520 blocks) and there are only 523 leaf blocks If we add 523 and 520, we get the original 1043 This means the blocks are totally empty and ready to be reused (blocks on the FREELIST for an index must be empty, unlike blocks on the FREELIST for a heap organized table) This demonstration highlights two points: Space is reused on index blocks as soon as a row comes along that can reuse it When an index block is emptied, it can be taken out of the index structure and may be reused later.

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