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// @tags: [
// requires_collstats,
// requires_non_retryable_commands,
// uses_testing_only_commands,
// ]
// SERVER-15033 truncate on a regular collection
var t = db.getCollection('collection_truncate');
t.drop();
function truncate() {
// Until SERVER-15274 is implemented, this is the only way to truncate a collection.
assert.commandWorked(t.runCommand('emptycapped')); // works on non-capped as well.
}
function assertEmpty() {
var stats = t.stats();
assert.eq(stats.count, 0);
assert.eq(stats.size, 0);
if ('numExtents' in stats) {
assert.lte(stats.numExtents, 1);
}
assert.eq(t.count(), 0);
assert.eq(t.find().itcount(), 0);
var res = t.validate({full: true});
assert.commandWorked(res);
assert(res.valid, "failed validate(): " + tojson(res));
}
// Single record case.
t.insert({a: 1});
truncate();
assertEmpty();
// Multi-extent case.
var initialStorageSize = t.stats().storageSize;
while (t.stats().storageSize == initialStorageSize) {
t.insert({a: 1});
}
truncate();
assertEmpty();
// Already empty case.
truncate();
assertEmpty();
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