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Starting with SQLite version 3.3.0, SQLite supports something called shared cache mode, which allows multiple connections in a single process to use a common page cache, as shown in Figure 6-1. This feature is designed for embedded servers where a single thread can efficiently manage multiple database connections on behalf of other threads. The connections in this case share a single page cache as well as a different concurrency model. Because of the shared cache, the server thread can operate with significantly lower memory usage and better concurrency than if each thread were to manage its own connection. Normally, each connection allocates enough memory to hold 2,000 pages in the page cache. Rather than each thread consuming that much memory with its own connection, it shares that memory with other threads using a single page cache. In this model, threads rely on a server thread to manage their database connections for them. A thread sends SQL statements to the server through some communication mechanism; the server executes them using the thread s assigned connection and then sends the results back. The thread can still issue commands and control its own transactions; only its actual connection exists in, and is managed by, another thread.

This is probably the genesis of this myth in the first place: blocks are not visible as having free space on them in an index structure as they are in a table In a table, you can see blocks on the FREELIST, even if they have data on them In an index, you will only see completely empty blocks on the FREELIST; blocks that have at least one index entry (and remaining free space) will not be as clearly visible..

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This seems like common sense. If you are going to create an index on the columns C1 and C2 in a table T with 100,000 rows, and you find C1 has 100,000 distinct values and C2 has 25,000 distinct values, you would want to create the index on T(C1,C2). This means that C1 should be first, which is the commonsense approach. The fact is, when comparing vectors of data (consider C1, C2 to be a vector), it doesn t matter which you put first. Consider the following example. We will create a table based on ALL_OBJECTS and an index on the OWNER, OBJECT_TYPE, and OBJECT_NAME columns (least discriminating to most discriminating) and also on OBJECT_NAME, OBJECT_TYPE, and OWNER: ops$tkyte@ORA11GR2> create table t 2 as 3 select * from all_objects; Table created. ops$tkyte@ORA11GR2> create index t_idx_1 on t(owner,object_type,object_name); Index created. ops$tkyte@ORA11GR2> create index t_idx_2 on t(object_name,object_type,owner); Index created. ops$tkyte@ORA11GR2> select count(distinct owner), count(distinct object_type), 2 count(distinct object_name ), count(*) 3 from t; DISTINCTOWNER DISTINCTOBJECT_TYPE DISTINCTOBJECT_NAME COUNT(*) ------------- ------------------- ------------------- -------28 36 28537 48243 Now, to show that neither is more efficient space-wise, we ll measure their space utilization: ops$tkyte@ORA11GR2> analyze index t_idx_1 validate structure; Index analyzed. ops$tkyte@ORA11GR2> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats; BTREE_SPACE PCT ----------- -----2702744 89.0 OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------2 28

To highlight just the lowest results, you can use the Bottom 10 Items conditional formatting option. The other options in the Top/Bottom Rules list work similarly, and you can select these to highlight the top or bottom items or percent, or cells with above or below average values. Follow these instructions to highlight the bottom two results in the selected cells, using a custom format: 1. In the pivot table, select the cells you want to format, and on the Ribbon, click the Home tab, and then in the Styles group, click Conditional Formatting. 2. In the list of conditional formatting options, click Top/Bottom Rules, and then click Bottom 10 Items. The Bottom 10 Items dialog box opens, with ten as the setting in the scroll box at the left. The default formatting option, Light Red Fill with Dark Red Text, is selected in the drop-down list at the right. The selected cells show a preview of this formatting, and you can change either of the settings to meet your requirements. 3. In the scroll box, change the number of items to two. You can select a formatting option from the drop-down list or create a custom format. 4. Click the drop-down arrow to open the formatting list, and then click Custom Format, to open the Format Cells dialog box. 5. In the Format Cells dialog box, select the Number, Font, Border, and Fill options you want for the highlighted cells.

ops$tkyte@ORA11GR2> analyze index t_idx_2 validate structure; Index analyzed. ops$tkyte@ORA11GR2> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats; BTREE_SPACE PCT ----------- -----2702744 89.0 OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------1 13

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