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/*
* SERVER-15033 truncate on a regular collection
*
* @tags: [
* requires_collstats,
* requires_non_retryable_commands,
* uses_testing_only_commands,
* requires_emptycapped,
* uses_full_validation,
* no_selinux,
* # TODO SERVER-60823 re-add transaction support
* does_not_support_transactions,
* ]
*/
(function() {
'use strict';
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);
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.
const initialStorageSize = t.stats().storageSize;
const long_string = Array(1024 * 1024).toString();
let idx = 0;
while (t.stats().storageSize == initialStorageSize) {
let bulk = t.initializeUnorderedBulkOp();
const nDocs = 300;
for (let i = 0; i < nDocs; i++) {
bulk.insert({a: ++idx, text: long_string});
}
assert.commandWorked(bulk.execute());
}
jsTest.log("Initial storage size: " + initialStorageSize);
jsTest.log("Num inserts: " + idx);
jsTest.log("Storage size after inserts: " + t.stats().storageSize);
truncate();
assertEmpty();
// Already empty case.
truncate();
assertEmpty();
}());
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