gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/index5.test (about)

     1  # 2012 August 6
     2  #
     3  # The author disclaims copyright to this source code.  In place of
     4  # a legal notice, here is a blessing:
     5  #
     6  #    May you do good and not evil.
     7  #    May you find forgiveness for yourself and forgive others.
     8  #    May you share freely, never taking more than you give.
     9  #
    10  #***********************************************************************
    11  #
    12  
    13  
    14  set testdir [file dirname $argv0]
    15  source $testdir/tester.tcl
    16  set ::testprefix index5
    17  
    18  do_test 1.1 {
    19    if {[permutation]=="memsubsys1"} {
    20      execsql { PRAGMA auto_vacuum = 0; }
    21    }
    22    execsql {
    23      PRAGMA page_size = 1024;
    24      CREATE TABLE t1(x);
    25      BEGIN;
    26    }
    27    for {set i 0} {$i < 100000} {incr i} {
    28      execsql { INSERT INTO t1 VALUES(randstr(100,100)) }
    29    }
    30    execsql COMMIT
    31    execsql { 
    32      CREATE INDEX i1 ON t1(x);
    33      DROP INDEX I1;
    34      PRAGMA main.page_size;
    35    }
    36  } {1024}
    37  
    38  db close
    39  testvfs tvfs
    40  tvfs filter xWrite
    41  tvfs script write_cb
    42  proc write_cb {xCall file handle iOfst args} {
    43    if {[file tail $file]=="test.db"} {
    44      lappend ::write_list [expr $iOfst/1024 + 1]
    45    }
    46  }
    47  
    48  do_test 1.2 {
    49    sqlite3 db test.db -vfs tvfs
    50    set ::write_list [list]
    51    execsql { CREATE INDEX i1 ON t1(x) }
    52  } {}
    53  
    54  do_test 1.3 {
    55    set nForward 0
    56    set nBackward 0
    57    set nNoncont 0
    58    set iPrev [lindex $::write_list 0]
    59    for {set i 1} {$i < [llength $::write_list]} {incr i} {
    60      set iNext [lindex $::write_list $i]
    61      if {$iNext==($iPrev+1)} {
    62        incr nForward
    63      } elseif {$iNext==($iPrev-1)} { 
    64        incr nBackward 
    65      } else {
    66        incr nNoncont
    67      }
    68      set iPrev $iNext
    69    }
    70    if {0} {
    71      puts -nonewline \
    72          " (forward=$nForward, back=$nBackward, noncontiguous=$nNoncont)"
    73    }
    74  
    75    expr {$nForward > 2*($nBackward + $nNoncont)}
    76  } {1}
    77  db close
    78  tvfs delete
    79  
    80  finish_test