github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/testdata/tcl/vacuummem.test (about)

     1  # 2005 February 15
     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  # This file implements regression tests for SQLite library.  The
    12  # focus of this file is testing that the VACUUM statement correctly
    13  # frees any memory used for a temporary cache.
    14  #
    15  
    16  set testdir [file dirname $argv0]
    17  source $testdir/tester.tcl
    18  set testprefix vacuummem
    19  
    20  if {[permutation]=="memsubsys1"} {
    21    finish_test
    22    return
    23  }
    24  
    25  # If ENABLE_MEMORY_MANAGEMENT is defined, when VACUUM is run the temp db
    26  # is able to borrow space from the main db (and it does, because the
    27  # temp db is configure with a very small cache). When the VACUUM is
    28  # finished and the temp db closed, all the page-cache memory currently 
    29  # assigned to the temp db is freed. If ENABLE_MEMORY_MANAGEMENT is defined
    30  # this causes the total memory usage to drop much more than expected,
    31  # causing tests in this file to fail.
    32  #
    33  ifcapable memorymanage {
    34    finish_test
    35    return
    36  }
    37  
    38  
    39  proc memory_used {} { 
    40    set stat [sqlite3_status SQLITE_STATUS_MEMORY_USED 1]  
    41    lindex $stat 1
    42  }
    43  
    44  do_execsql_test 1.0 {
    45    PRAGMA cache_size = -2000;
    46    CREATE TABLE t1(a, b, c);
    47  
    48    WITH r(i) AS (
    49      SELECT 1 UNION ALL SELECT i+1 FROM r WHERE i<100000
    50    )
    51    INSERT INTO t1 SELECT randomblob(100),randomblob(100),randomblob(100) FROM r;
    52  
    53    CREATE INDEX t1a ON t1(a);
    54    CREATE INDEX t1b ON t1(b);
    55    CREATE INDEX t1c ON t1(c);
    56  }
    57  set ans "#/[memory_used]/"
    58  
    59  do_test 1.1 { memory_used } $ans
    60  
    61  do_execsql_test 1.2 VACUUM
    62  
    63  do_test 1.3 { memory_used } $ans
    64  
    65  do_execsql_test 1.4 {
    66    SELECT count(*) FROM t1 WHERE +a IS NOT NULL
    67  } {100000}
    68  
    69  do_test 1.5 { memory_used } $ans
    70  
    71  
    72  
    73  finish_test