mirror of https://github.com/facebook/rocksdb.git
100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include <cstdio>
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#include <string>
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#include <vector>
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#include "rocksdb/db.h"
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#include "rocksdb/options.h"
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#include "rocksdb/utilities/backup_engine.h"
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using ROCKSDB_NAMESPACE::BackupEngine;
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using ROCKSDB_NAMESPACE::BackupEngineOptions;
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using ROCKSDB_NAMESPACE::BackupEngineReadOnly;
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using ROCKSDB_NAMESPACE::BackupInfo;
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using ROCKSDB_NAMESPACE::DB;
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using ROCKSDB_NAMESPACE::Env;
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using ROCKSDB_NAMESPACE::Options;
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using ROCKSDB_NAMESPACE::ReadOptions;
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using ROCKSDB_NAMESPACE::Status;
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using ROCKSDB_NAMESPACE::WriteOptions;
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#if defined(OS_WIN)
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std::string kDBPath = "C:\\Windows\\TEMP\\rocksdb_example";
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#else
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std::string kDBPath = "/tmp/rocksdb_example";
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#endif
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int main() {
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DB* db;
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Options options;
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// Optimize RocksDB. This is the easiest way to get RocksDB to perform well
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options.IncreaseParallelism();
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options.OptimizeLevelStyleCompaction();
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// create the DB if it's not already present
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options.create_if_missing = true;
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// open DB
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Status s = DB::Open(options, kDBPath, &db);
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assert(s.ok());
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// Put key-value
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db->Put(WriteOptions(), "key1", "value1");
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assert(s.ok());
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// create backup
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BackupEngine* backup_engine;
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s = BackupEngine::Open(Env::Default(),
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BackupEngineOptions("/tmp/rocksdb_example_backup"),
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&backup_engine);
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assert(s.ok());
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backup_engine->CreateNewBackup(db);
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assert(s.ok());
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std::vector<BackupInfo> backup_info;
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backup_engine->GetBackupInfo(&backup_info);
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s = backup_engine->VerifyBackup(1);
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assert(s.ok());
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// Put key-value
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db->Put(WriteOptions(), "key2", "value2");
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assert(s.ok());
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db->Close();
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delete db;
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db = nullptr;
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// restore db to backup 1
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BackupEngineReadOnly* backup_engine_ro;
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s = BackupEngineReadOnly::Open(
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Env::Default(), BackupEngineOptions("/tmp/rocksdb_example_backup"),
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&backup_engine_ro);
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assert(s.ok());
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s = backup_engine_ro->RestoreDBFromBackup(1, "/tmp/rocksdb_example",
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"/tmp/rocksdb_example");
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assert(s.ok());
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// open db again
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s = DB::Open(options, kDBPath, &db);
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assert(s.ok());
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std::string value;
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s = db->Get(ReadOptions(), "key1", &value);
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assert(!s.IsNotFound());
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s = db->Get(ReadOptions(), "key2", &value);
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assert(s.IsNotFound());
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delete backup_engine;
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delete backup_engine_ro;
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delete db;
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return 0;
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}
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