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

     1  # 2017 April 26
     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  set testdir [file dirname $argv0]
    14  source $testdir/tester.tcl
    15  set testprefix cachespill
    16  
    17  ifcapable !pager_pragmas {
    18    finish_test
    19    return
    20  }
    21  
    22  #-------------------------------------------------------------------------
    23  # Test that "PRAGMA cache_spill = 0" completely disables cache spilling.
    24  #
    25  do_execsql_test 1.1 {
    26    PRAGMA auto_vacuum = 0;
    27    PRAGMA page_size = 1024;
    28    PRAGMA cache_size = 100;
    29    CREATE TABLE t1(a);
    30  }
    31  
    32  do_test 1.2 {
    33    file size test.db
    34  } {2048}
    35  
    36  do_test 1.3 {
    37    execsql {
    38      BEGIN;
    39        WITH s(i) AS (
    40          SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<200
    41        ) INSERT INTO t1 SELECT randomblob(900) FROM s;
    42    }
    43    expr {[file size test.db] > 50000}
    44  } {1}
    45  
    46  do_test 1.4 {
    47    execsql ROLLBACK
    48    file size test.db
    49  } {2048}
    50  
    51  do_test 1.5 {
    52    execsql {
    53      PRAGMA cache_spill = 0;
    54      BEGIN;
    55        WITH s(i) AS (
    56          SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<200
    57        ) INSERT INTO t1 SELECT randomblob(900) FROM s;
    58    }
    59    file size test.db
    60  } {2048}
    61  
    62  do_test 1.5 {
    63    execsql {
    64      ROLLBACK;
    65      PRAGMA cache_spill = 1;
    66      BEGIN;
    67        WITH s(i) AS (
    68          SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<200
    69        ) INSERT INTO t1 SELECT randomblob(900) FROM s;
    70    }
    71    expr {[file size test.db] > 50000}
    72  } {1}
    73  
    74  do_execsql_test 1.6 { ROLLBACK }
    75  
    76  
    77  finish_test