Sql server Sql Server 2008 R2:由于内存压力,AppDomain已标记为卸载
我正在使用服务使用的数据库运行Sql Server 2008 R2 Express。在服务启动时,通过AttachDBFileName选项连接数据库。该服务持续运行,仅在自动更新后重新启动 有时,此模式会出现在Sql Server日志中:Sql server Sql Server 2008 R2:由于内存压力,AppDomain已标记为卸载,sql-server,sql-server-2008,memory,clr,Sql Server,Sql Server 2008,Memory,Clr,我正在使用服务使用的数据库运行Sql Server 2008 R2 Express。在服务启动时,通过AttachDBFileName选项连接数据库。该服务持续运行,仅在自动更新后重新启动 有时,此模式会出现在Sql Server日志中: 10/09/2013 11:18:05,spid18s,Unknown,AppDomain 6 (..MDF.dbo[runtime].5) unloaded. 10/09/2013 11:18:05,spid1s,Unknown,AppDomain 6 (.
10/09/2013 11:18:05,spid18s,Unknown,AppDomain 6 (..MDF.dbo[runtime].5) unloaded.
10/09/2013 11:18:05,spid1s,Unknown,AppDomain 6 (...MDF.dbo[runtime].5) is marked for unload due to memory pressure.
10/09/2013 11:16:16,spid53,Unknown,AppDomain 6 (....MDF.dbo[runtime].5) created.
10/09/2013 11:16:00,spid28s,Unknown,AppDomain 5 (....MDF.dbo[runtime].4) unloaded.
10/09/2013 11:16:00,spid1s,Unknown,AppDomain 5 (....MDF.dbo[runtime].4) is marked for unload due to memory pressure.
10/09/2013 11:15:41,spid53,Unknown,AppDomain 5 (...MDF.dbo[runtime].4) created.
10/09/2013 11:14:20,spid24s,Unknown,AppDomain 4 (...MDF.dbo[runtime].3) unloaded.
10/09/2013 11:14:20,spid1s,Unknown,AppDomain 4 (...MDF.dbo[runtime].3) is marked for unload due to memory pressure.
这会导致性能问题,因为每次重新启动AppDomain时,缓冲区都会被删除,数据库会在几秒钟内无响应
根据,这可能是由于CLR模块中的内存泄漏或其他错误造成的(尽管我认为应该在SQLServer2008R2中修复)。安装了一个CLR模块,代码如下:
[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.UserDefined,
MaxByteSize=8000)]
public class Concatenate : IBinarySerialize
{
/// <summary>
/// The variable that holds the intermediate result of the concatenation
/// </summary>
private StringBuilder intermediateResult;
public void Init()
{
// Put your code here
intermediateResult = new StringBuilder();
}
public void Accumulate(SqlString Value)
{
if (Value.IsNull)
return;
intermediateResult.Append(Value.Value).Append(", ");
}
public void Merge(Concatenate Group)
{
intermediateResult.Append(Group.intermediateResult);
}
public SqlString Terminate()
{
string output = string.Empty;
//delete the trailing comma, if any
if (intermediateResult != null && intermediateResult.Length > 0)
output = intermediateResult.ToString(0, intermediateResult.Length - 2);
return new SqlString(output);
}
#region IBinarySerialize Members
public void Read(System.IO.BinaryReader r)
{
if (r == null) throw new ArgumentNullException("r");
intermediateResult = new StringBuilder(r.ReadString());
}
public void Write(System.IO.BinaryWriter w)
{
if (w == null) throw new ArgumentNullException("w");
w.Write(intermediateResult.ToString());
}
#endregion
}
[可序列化]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.UserDefined,
MaxByteSize=8000)]
公共类连接:IBinarySerialize
{
///
///保存连接的中间结果的变量
///
私有StringBuilder中间结果;
公共void Init()
{
//把你的代码放在这里
中间结果=新的StringBuilder();
}
公共无效累积(SqlString值)
{
if(Value.IsNull)
返回;
intermediateResult.Append(Value.Value).Append(“,”);
}
公共无效合并(连接组)
{
intermediateResult.Append(Group.intermediateResult);
}
公共SqlString终止()
{
字符串输出=string.Empty;
//删除后面的逗号(如果有)
if(intermediateResult!=null&&intermediateResult.Length>0)
输出=intermediateResult.ToString(0,intermediateResult.Length-2);
返回新的SqlString(输出);
}
#区域IBinarySerialize成员
公共无效读取(System.IO.BinaryReader r)
{
如果(r==null)抛出新的ArgumentNullException(“r”);
intermediateResult=新的StringBuilder(r.ReadString());
}
公共无效写入(System.IO.BinaryWriter w)
{
如果(w==null)抛出新的ArgumentNullException(“w”);
w、 写入(intermediateResult.ToString());
}
#端区
}
此外,MS Exchange正在服务器上运行,MDB存储占用了90%的可用内存。但是,我以前在其他具有大量可用内存的服务器上看到过这种错误,因此我认为内存压力不是问题的真正原因
有什么想法会导致这个问题吗?看看这里,如果你有同样的问题,请阅读:你在这里写了一份事实陈述。问题是什么?