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     1      1   ## SQLite Expert Extension
     2      2   
     3      3   This folder contains code for a simple system to propose useful indexes
     4      4   given a database and a set of SQL queries. It works as follows:
     5      5   
     6      6     1. The user database schema is copied to a temporary database.
     7      7   
     8         -  1. All SQL queries are prepared against the temporary database. I
            8  +  1. All SQL queries are prepared against the temporary database.
     9      9        Information regarding the WHERE and ORDER BY clauses, and other query
    10         -     features that affect index selection, are recorded.
           10  +     features that affect index selection are recorded.
    11     11   
    12         -  1. The information gathered in step 2 is used to create (possibly a large
    13         -     number of) candidate indexes.
           12  +  1. The information gathered in step 2 is used to create candidate indexes
           13  +     - indexes that the planner might have made use of in the previous step,
           14  +     had they been available.
    14     15   
    15     16     1. A subset of the data in the user database is used to generate statistics
    16     17        for all existing indexes and the candidate indexes generated in step 3
    17     18        above.
    18     19   
    19     20     1. The SQL queries are prepared a second time. If the planner uses any
    20     21        of the indexes created in step 3, they are recommended to the user.
................................................................................
    63     64   
    64     65   Or an entire text file worth of queries with:
    65     66   
    66     67   <pre>
    67     68     ./sqlite3_expert -file &lt;text-file&gt; test.db
    68     69   </pre>
    69     70   
    70         -By default, sqlite3_expert generates index statistics using all the data in
           71  +By default, sqlite3\_expert generates index statistics using all the data in
    71     72   the user database. For a large database, this may be prohibitively time
    72         -consuming. The "-sample" option may be used to configure sqlite3_expert to
           73  +consuming. The "-sample" option may be used to configure sqlite3\_expert to
    73     74   generate statistics based on an integer percentage of the user database as
    74     75   follows:
    75     76   
    76     77   <pre>
    77     78     # Generate statistics based on 25% of the user database rows:
    78     79     ./sqlite3_expert -sample 25 -sql &lt;sql-query&gt; test.db
    79     80   
    80     81     # Do not generate any statistics at all:
    81     82     ./sqlite3_expert -sample 0 -sql &lt;sql-query&gt; test.db
    82     83   </pre>