我正在运行一个创建表然后插入一些数据的程序。
这是访问数据库的唯一程序。
我随机得到 ORA-08177。
实际代码有些复杂，但我编写了一个简单的程序来重现这种行为。
using System;
using System.Data;
using Oracle.DataAccess.Client;
namespace orabug
{
class Program
{
private const string ConnectionString = ""; // Valid connection string here
// Recreates the table
private static void Recreate()
{
using (var connection = new OracleConnection(ConnectionString)) {
connection.Open();
using (var command = connection.CreateCommand()) {
command.CommandText = @"
declare
table_count binary_integer;
begin
select count(*) into table_count from sys.user_tables where table_name = 'TESTTABLE';
if table_count > 0 then
execute immediate 'drop table TestTable purge';
end if;
execute immediate 'create table TestTable(id nvarchar2(32) primary key)';
end;";
command.ExecuteNonQuery();
}
connection.Close();
}
}
// Opens session sessionCount times, inserts insertCount rows in each session.
private static void Insert(int sessionCount, int insertCount)
{
for (int sessionNumber = 0; sessionNumber < sessionCount; sessionNumber++)
using (var connection = new OracleConnection(ConnectionString)) {
connection.Open();
using (var transaction = connection.BeginTransaction(IsolationLevel.Serializable)) {
for (int insertNumber = 0; insertNumber < insertCount; insertNumber++)
using (var command = connection.CreateCommand()) {
command.BindByName = true;
command.CommandText = "insert into TestTable (id) values(:id)";
var id = Guid.NewGuid().ToString("N");
var parameter = new OracleParameter("id", OracleDbType.NVarchar2) {Value = id};
command.Parameters.Add(parameter);
command.Transaction = transaction;
command.ExecuteNonQuery();
}
transaction.Commit();
}
connection.Close();
}
}
static void Main(string[] args)
{
int iteration = 0;
while (true) {
Console.WriteLine("Running iteration: {0}", iteration);
try {
Recreate();
Insert(10, 100);
Console.WriteLine("No error");
}
catch (Exception exception) {
Console.WriteLine(exception.Message);
}
iteration++;
}
}
}
}
此代码运行无限循环。
在每次迭代中，它执行以下操作 10 次：
公开课
插入 100 行随机数据
关闭会话
显示一条消息说没有发生错误
如果发生错误，则捕获异常并打印其消息，然后执行下一次迭代。
这是示例输出。如您所见，ORA-08177 与成功的交互随机交错。
Running iteration: 1
No error
Running iteration: 2
ORA-08177: can't serialize access for this transaction
Running iteration: 3
ORA-08177: can't serialize access for this transaction
Running iteration: 4
ORA-08177: can't serialize access for this transaction
Running iteration: 5
ORA-08177: can't serialize access for this transaction
Running iteration: 6
ORA-08177: can't serialize access for this transaction
Running iteration: 7
No error
Running iteration: 8
No error
Running iteration: 9
ORA-08177: can't serialize access for this transaction
Running iteration: 10
ORA-08177: can't serialize access for this transaction
Running iteration: 11
ORA-08177: can't serialize access for this transaction
Running iteration: 12
ORA-08177: can't serialize access for this transaction
Running iteration: 13
ORA-08177: can't serialize access for this transaction
Running iteration: 14
ORA-08177: can't serialize access for this transaction
Running iteration: 15
ORA-08177: can't serialize access for this transaction
Running iteration: 16
ORA-08177: can't serialize access for this transaction
Running iteration: 17
No error
Running iteration: 18
No error
Running iteration: 19
ORA-08177: can't serialize access for this transaction
Running iteration: 20
No error
我正在运行 Oracle 11.1.0.6.0 并使用 ODP.NET 2.111.6.20。
更改隔离级别以ReadCommited解决问题，但我真的想在Serializable级别上运行它。
看起来我并不孤单
，但没有给出答案，所以我再次询问。
我做错了什么，我该如何解决这个问题？
由 APC 编辑
为防止其他人发现错误的树，发布的代码示例只是 ORA-8177 错误的生成器。显然实际的代码是不同的；具体来说，删除和重新创建表格是一条红鲱鱼。