Documentation Source Text

[https://www.sqlite.org/src/file/ext/misc/shathree.c|extension function "sha3_query()"]
that is included with the command-line shell.

<tcl>hd_fragment selftest {.selftest dot-command}</tcl>
<h1>Database Content Self-Tests</h1>

<p>The ".selftest" command attempts to verify that a database is
intact and is not corrupt.  

The .selftest command looks for a table in schema named "selftest"
and defined as follows:

<tclscript>DisplayCode {
CREATE TABLE selftest(
  tno INTEGER PRIMARY KEY,  -- Test number
  op TEXT,                  -- 'run' or 'memo'
  cmd TEXT,                 -- SQL command to run, or text of "memo"
  ans TEXT                  -- Expected result of the SQL command
);
}</tclscript>

<p>The .selftest command reads the rows of the selftest table in
selftest.tno order.
For each 'memo' row, it writes the text in 'cmd' to the output.  For
each 'run' row, it runs the 'cmd' text as SQL and compares the result
to the value in 'ans', and shows an error message if the results differ.

<p>If there is no selftest table, the ".selftest" command runs
[PRAGMA integrity_check].

<p>The ".selftest --init" command creates the selftest table if it
does not already exists, then appends entries that check the SHA3
hash of the content of all tables.  Subsequent runs of ".selftest"
will verify that the database has not been changed in any way.  To
generates tests to verify that a subset of the tables are unchanged,
simply run ".selftest --init" then [DELETE] the selftest rows that

    synchronous=FULL.
    If durability is not a concern, then synchronous=NORMAL is normally
    all one needs in WAL mode.</p>

    <p>^The default setting is usually synchronous=FULL.
    The [SQLITE_EXTRA_DURABLE] compile-time option changes the
    default to synchronous=EXTRA.</p>

    <p>The TEMP schema always has synchronous=OFF since the content of
    of TEMP is ephemeral and is not expected to survive a power outage.
    Attempts to change the synchronous setting for TEMP are
    silently ignored.

    <p>See also the [fullfsync] and [checkpoint_fullfsync] pragmas.</p>
}

Pragma temp_store {
    <p>^(<b>PRAGMA temp_store;
        <br>PRAGMA temp_store = </b>