/// <summary>
/// Creates a shard map manager, creates a shard map, and creates a shard
/// with a mapping for the full range of 32-bit integers.
/// </summary>
private static void CreateShardMapManagerAndShard()
{
if (MultiShardConfiguration.objShardMapManager != null)
{
ConsoleUtils.WriteWarning("Shard Map Manager already exists");
return;
}
// Create shard map manager database
if (!SqlDatabaseUtils.ExistsDatabase(MultiShardConfiguration.ShardMapManagerServerName, MultiShardConfiguration.ShardMapManagerDatabaseName))
{
SqlDatabaseUtils.CreateDatabase(MultiShardConfiguration.ShardMapManagerServerName, MultiShardConfiguration.ShardMapManagerDatabaseName);
}
// Create shard map manager
string shardMapManagerConnectionString = MultiShardConfiguration.GetConnectionString();
MultiShardConfiguration.objShardMapManager = ShardManagementUtils.CreateOrGetShardMapManager(shardMapManagerConnectionString);
// Create shard map
RangeShardMap <int> shardMap = ShardManagementUtils.CreateOrGetRangeShardMap <int>(
MultiShardConfiguration.objShardMapManager, MultiShardConfiguration.ShardMapName);
// Create schema info so that the split-merge service can be used to move data in sharded tables
// and reference tables.
CreateSchemaInfo(shardMap.Name);
// If there are no shards, add two shards: one for [0,100) and one for [100,+inf)
if (!shardMap.GetShards().Any())
{
CreateShardSample.CreateShard(shardMap, new Range <int>(0, 100));
CreateShardSample.CreateShard(shardMap, new Range <int>(100, 200));
}
}
/// <summary>
/// Tries to get the ShardMapManager that is stored in the specified database.
/// </summary>
public static ShardMapManager TryGetShardMapManager()
{
if (!SqlDatabaseUtils.ExistsDatabase(MultiShardConfiguration.ShardMapManagerServerName, MultiShardConfiguration.ShardMapManagerDatabaseName))
{
// Shard Map Manager database has not yet been created
return(null);
}
ShardMapManager shardMapManager;
bool smmExists = ShardMapManagerFactory.TryGetSqlShardMapManager(MultiShardConfiguration.GetConnectionString(),
ShardMapManagerLoadPolicy.Lazy, out shardMapManager);
if (!smmExists)
{
// Shard Map Manager database exists, but Shard Map Manager has not been created
return(null);
}
return(shardMapManager);
}
