Quick links to answers:

• Argument Unpacking
• Braces
• Chaining Comparison Operators
• Decorators
• Default Argument Gotchas / Dangers of Mutable Default arguments
• Descriptors
• Dictionary default .get value
• Docstring Tests
• Ellipsis Slicing Syntax
• Enumeration
• For/else
• Function as iter() argument
• Generator expressions
• import this
• In Place Value Swapping
• List stepping
• __missing__ items
• Multi-line Regex
• Named string formatting
• Nested list/generator comprehensions
• New types at runtime
• .pth files
• ROT13 Encoding
• Regex Debugging
• Sending to Generators
• Tab Completion in Interactive Interpreter
• Ternary Expression
• try/except/else
• Unpacking+print() function
• with statement

Source: http://stackoverflow.com/questions/101268/hidden-features-of-python

Dynamic programming

• Adding properties and methods to an ExpandoObject, dynamically!
• Extend your objects with DynamicObject to get a dynamic experience
• Invoke a dynamic object as if it were a method
• Using dynamic in the real world with IronPython
• Playing with anonymous types in C#
• Exploring reflection – Finding a value in any of the objects properties
• What is reflection and why is it useful?
• Using reflection to get information about attributes on your class and properties
• Setting values by using reflection
• Creating static methods at runtime
• Getting information about a method and its local variables
• How Dynamic Methods affect resources like memory and disk space>
• Calling a non-dynamic method with parameters from a dynamic method
• Exploring OpCodes with DynamicMethod and looking at the evaluation stack
• Calling a dynamic method from a dynamic method
• Creating a recursive dynamic method that calculates factorial
• Creating a Dynamic Method that uses a Switch

Software Architecture

• Over-engineering trivial tasks can be challenging and educating
• Making code more readable with anonymous functions
• Adapting to Inversion of Control and Dependency Injection

Compiler as a Service

• Using Roslyn to parse C# code files
• Getting all methods from a code file with Roslyn
• Creating a basic code analysis with Roslyn
• Exploring how to write a code analyzer with Roslyn
• Using the C# Interactive Window that comes with Roslyn
• Using the C# Interactive Window that comes with Roslyn – Part 2
• Hosted Execution of smaller code snippets with Roslyn

Screencasts

• C# 5 Async CTP – Async in Action – Video screencast
• C# 5 Async CTP – Old VS New – Video screencast
• C# 4.0 Using the Dynamic Keyword
• Generic Programming in C#

Other

• WPF vs WinForms – Which is easier to learn?
• Visual Studio 11 and Visual Studio 2010 Side by Side
• When can knowing about IL and the internals be useful?

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96533/sqltrace.htm

22. DQL Hints
SELECT object_name FROM dm_document ENABLE (RETURN_TOP 10)
For DB2, performance can be improved using
SELECT object_name FROM dm_document ENABLE (RETURN_TOP 10, OPTIMIZE_TOP 10)
The FETCH_ALL_RESULTS N hint fetches all the results from the database
immediately and closes the cursor. The hint does not affect the execution plan,
but may free up database resources more quickly.
To fetch all the results, set N to 0.
On SQL Server, it is recommended that you use SQL_DEF_RESULT_SETS
instead of the FETCH_ALL_RESULTS hint. SQL_DEF_RESULTS_SETS
provides the same benefits and is the recommended way to access SQL Server
databases.
Passthrough hints are hints that are passed to the RDBMS server. They are not
handled by Content Server.
To include a passthrough hint, you must identify the database for which the
hint is valid. To identify the target database, keywords precede the hints. The
valid keywords are: ORACLE, SQL_SERVER, SYBASE, and DB2. For
example, the following statement includes passthrough hints for SQL Server:
SELECT “r_object_id” FROM “dm_document”
WHERE “object_name” =’test’
ENABLE SQL_SERVER(’ROBUST PLAN’,’FAST 4’,’ROBUST PLAN’)
For portability, you can include passthrough hints for multiple databases in
one statement. The entire list of hints must be enclosed in parentheses. The
syntax is:
(database_hint_list {,database_hint_list})
where database_hint_list is:
db_keyword(’hint’{,’hint})
db_keyword is one of the valid keywords identifying a database. hint is any hint
valid on the specified database.
For example:
SELECT object_name FROM dm_document doc dm_user u
WHERE doc.r_creator_name = u.user_name ENABLE
(ORACLE(’RULE’,’PARALLEL’), SYBASE(’AT ISOLATION READ
UNCOMMITTED’),SQL_SERVER(’LOOP JOIN’,’FAST 1’)
Use FETCH_ALL_RESULTS if you want to reduce the resources used by the
database server by quickly closing cursors. On SQL Server, try
FETCH_ALL_RESULTS if using SQL_DEF_RESULT_SETS did not improve
query performance.
23. If the table is registered, check with the owner of the registered table, or a Documentum superuser, about giving you access to the table.
You will need at least a BROWSE permit on the registered table object in order to access it. If the table has not yet been registered, check with the table’s owner about registering it. Note that you must have READ access to the dm_registered object for this table in order to access it in any way (SELECT, INSERT, UPDATE, DELETE).
Note that if you specified the special dm_dbo document base owner, the first parameter will hold the actual name of the document base owner.
24. DQL to list docbrokers
execute list_targets
25. DQL to list worrkflow information
select task_name, task_state, actual_start_date, dequeued_date from dmi_queue_item where router_id = ‘workflowId’
26. Query to find active workflows, supervisors of the workflows
select r_object_id, object_name, title, owner_name,r_object_type, r_creation_date, r_modify_date, a_content_type from dm_document where r_object_id in(select r_component_id from dmi_package where r_workflow_id in (select r_object_id from dm_workflow where r_runtime_state = 1))
27. Though this is not DQL, I thought of mentioning here as it most widely used DFC operation
sysObject.queue (”dm_autorender_win31?, _
“rendition”, _
0, _
False, _
dueDate, _
“rendition_req_ps_pdf”)
28. To find ACLs related to dm_sysobject:
select r_object_id as obj_id, object_name from
dm_sysobject (all)
where acl_name =” and
acl_domain = ”
To find ACLs as the default ACL of a user:
select user_name from dm_user where acl_name=”
To find ACLs associated with a type:
select r_object_id, r_type_name from dmi_type_info where acl_domain=” and acl_name=”
When these queries do not return any related objects and you still cannot delete the ACL, use tracing:
In the Message Tester or IAPI, execute the command: apply,c,NULL,SQL_TRACE,LEVEL,I,1
Then, try to delete the ACL that is causing problem.
Turn off tracing by executing:
apply,c,NULL,SQL_TRACE,LEVEL,I,0
Examine the session log for the trace output, located in $DOCUMENTUM/dba/log//
Excerpt of the session log:
[DM_ACL_E_DESTROY_IN_USE]error: “Failed to destroy the ACL ‘Documentum Users’ in domain ‘dbabep’ because it is in use.”
[DM_SESSION_I_SESSION_QUIT]info: “Session 01000dcb80010ccf quit.”
Run the following query from Oracle SQL:
select r_object_id from dm_sysobject_s where acl_domain =’dbabep’ and acl_name =’Documentum Users’ union select r_object_id from dm_user_s where acl_domain = ‘dbabep’ and acl_name =’Documentum Users’ union select r_object_id from dmi_type_info_s where acl_domain =’dbabep’ and acl_name =’Documentum Users’
It will return the r_object_id value = 09000dcb800362c4.
Run the following query from IDQL:
select object_name
from dm_sysobject
where r_object_id=’09000dcb800362c4′
If the above query returned nothing, then this object cannot be accessed by any Documentum WorkSpace method, only via SQL in the underlying Oracle database. The following entries must be deleted at the RDBMS level: dm_sysobject_s and dm_sysobject_r tables; there are no entries in the dmi_object table
29. List of object types and corresponding identifiers. Helpful when reading the code.
00 dmi_audittrail_attrs
03 dm_type
05 dmr_containment
06 dmr_content
08 dm_application
08 dm_job
08 dm_procedure
08 dm_query
08 dm_script
08 dm_smart_list
09 dm_document
0b dm_folder
0c dm_cabinet
0d dm_assembly
10 dm_method
11 dm_user
12 dm_group
19 dm_registered
1f dmi_index
26 dmi_registry
27 dm_format
28 dm_filestore
28 dm_store
2c dm_distributedstore
2e dmi_type_info
2f dm_dump_record
30 dmi_dump_object_record
31 dm_load_record
32 dmi_load_object_record
37 dm_relation
3a dm_location
3b dm_fulltext_index
3c dm_docbase_config
3d dm_server_config
40 dm_blobstore
41 dm_note
45 dm_acl
46 dm_policy
49 dmi_package
4a dmi_workitem
4c dm_activity
4d dm_workflow
53 dm_literal_expr
5e dm_federation
5f dm_audittrail_acl
5f dm_audittrail_group
5f dm_audittrail
66 dm_alias_set
6a dmi_dd_attr_info
0b dm_taxonomy
0b dm_xml_application
6b dm_display_config
20 dmi_sequence
30. Job scheduler Query
SELECT ALL r_object_id, a_next_invocation
FROM dm_job
WHERE (
(run_now = 1)
OR ( (is_inactive = 0)
AND ( ( a_next_invocation < = DATE(’now’)
AND a_next_invocation IS NOT NULLDATE )
OR ( a_next_continuation DATE(’now’))
OR (expiration_date IS NULLDATE))
AND ( (max_iterations = 0)
OR (a_iterations Template Properties
3) Under Template Audit Trail Setting, select option ‘Always On’ – Audit trail data for each instance will be available and saved at workflow completions.
31. In a workflow, a performer can enter comments while he/she is performing the task. And those comments are carried to the next performer in this workflow. When using WebPublisher workflow report to review the workflow instances, and in workflow history, you are only able to get the truncated comments back from WP’s interface. Especially for those already aborted workflow instances, there is no way that you can get the complete comments back from WP’s GUI. In some cases, those comments are very important to our customers and they need to find a way to get those comments back.
Here is the steps to get those comments back:
==
1) Identify the workflow from the dm_workflow table, get the r_object_id of the workflow:
select r_object_id, object_name from dm_workflow where object_name = ‘your work flow name’
2) Identify the notes that are carried by this workflow:
select r_note_id from dmi_package where r_workflow_id = ‘ the object id of the workflow’
3) Get the content id of each of those note ids returned:
select r_object_id from dmr_content where any parent_id = ‘the note id’
4) Go to DA, Administration->Job Management->Administration, use the “GET_PATH” method to find out the path of the files which stores the comments.
32. Query to get all documents expired in previous 1 month
SELECT s.r_object_id, s.object_name, DATETOSTRING(”r.a_expiration_date”,’mm/dd/yyyy’) as creation_date
FROM dm_sysobject_s s, dm_sysobject_r r
WHERE s.r_object_id = r.r_object_id
AND s.r_object_type = ‘dm_document’
AND DATEDIFF(month,”r.a_expiration_date”,DATE(NOW)) >= 0
AND DATEDIFF(month,”r.a_expiration_date”,DATE(NOW)) < = 1
AND r.r_version_label = ‘Expired’
ORDER BY 3
33. DQL to find all the folders in a Cabinet, where the folders are contentless
SELECT f1.object_name, f1.r_object_id, f1.r_folder_path
FROM dm_folder f1
WHERE FOLDER(’/Cabinetname’,descend)
AND NOT EXISTS (SELECT f2.object_name FROM dm_sysobject f2 WHERE ANY f2.i_folder_id = f1.r_object_id)
ORDER BY object_name
34. Find Super Groups and sub groups
select distinct r_object_id, group_name as super_groups
from dm_group_sp where group_name not in (select gs.group_name
from dm_group_r gr, dm_group_s gs
where gr.r_object_id = gs.r_object_id
group by gs.group_name
having count(gr.i_supergroups_names) > 1)
union
select distinct r_object_id, group_name as sub_groups
from dm_group_sp where group_name in (select gs.group_name
from dm_group_r gr, dm_group_s gs
where gr.r_object_id = gs.r_object_id
group by gs.group_name
having count(gr.i_supergroups_names) > 1) ;
35. DQL for finding all checked out documents in a docbase
select * from dm_document where (r_lock_owner is not nullstring or r_lock_owner ” or r_lock_owner ‘ ‘)
36.DQL to list the users who has access to particular folder path
SELECT i_all_users_names FROM dm_group
WHERE group_name IN (SELECT r_accessor_name FROM dm_acl
WHERE object_name IN (SELECT acl_name FROM dm_folder
WHERE ANY r_folder_path = ‘/folderpath’))
ORDER BY i_all_users_names
37. Query to find out what user signed off on what document
SELECT “audited_obj_id” FROM “dm_audittrail” WHERE
“event_name” = ‘dm_signoff’ AND
“user_name” = ‘tom’ AND
substr (”audited_obj_id”, 1, 2) = ‘09′AND
“time_stamp” >= DATE(’01/01/1998′, ‘dd/mm/yy’) AND
“time_stamp” SELECT object_name, r_version_label FROM dm_sysobject where any r_version_label in (’WIP’) and r_object_id not in (select r_object_id from dm_sysobject where any r_version_label in (’Staging’, ‘Approved’, ‘Expired’) )
39. Query to get all expired documents in previous month
SELECT s.r_object_id, s.object_name, DATETOSTRING(”r.a_expiration_date”,’mm/dd/yyyy’) as creation_date
FROM dm_sysobject_s s, dm_sysobject_r r
WHERE s.r_object_id = r.r_object_id
AND s.r_object_type = ‘dm_document’
AND DATEDIFF(month,”r.a_expiration_date”,DATE(NOW)) >= 0
AND DATEDIFF(month,”r.a_expiration_date”,DATE(NOW)) < = 1
AND r.r_version_label = ‘Expired’
ORDER BY 3
0. Query to find the file system path location of a document
select doc.r_object_id, doc.object_name, MFILE_URL(”,-1,”) as mypath,doc.i_folder_id from dm_document doc
where
——————————————————————
Thursday, March 22, 2007
DQL Tips
————————————————————————————-
*** get CURRENT TIME on server ***
select DATE(NOW) as systime from dm_server_config
————————————————————————————-
*** get the implicit version label ***
select s.r_object_id,s.object_name,r.r_version_label from dm_sysobject s, dm_sysobject_r r where r.r_object_id = s.r_object_id and
r.i_position = -1
————————————————————————————-
*** include r_object_id to remove blank rows
select object_name, r_object_id, a_expiration_date from dfas_common where folder(‘/Raj Srinivasan’) and any a_expiration_date is not nulldate
————————————————————————————-
*** select documents with pdf renditions (optimized for performance) ***
select * from dm_document where exists(select * from dmr_content where any parent_id=dm_document.r_object_id and full_format=’pdf’)
————————————————————————————-
*** select all documents that have nulldate in repeating attribute
select object_name from dfas_common where folder(‘/Raj Srinivasan) and r_object_id NOT IN (select r_object_id from dfas_common where folder(‘/Raj Srinivasan’) and any a_expiration_date is not nulldate)
————————————————————————————-
*** select all documents that have nulldate in repeating attribute or a_expiration_date has past
select count(*) from dfas_common where folder(‘/content/Corporate Resources/Human Resources’,descend) and (any a_expiration_date <
date(today) or (r_object_id NOT IN (select r_object_id from dfas_common where folder('/content/Corporate Resources/Human Resources',descend)
and any a_expiration_date is not nulldate)))
————————————————————————————-
*** select folderpath with filename
select distinct s.object_name, fr.r_folder_path from dm_sysobject (all)
s,dm_sysobject_r sr,dm_folder_r fr where sr.i_position = -1 and
sr.r_object_id = s.r_object_id and fr.r_object_id = sr.i_folder_id and
fr.i_position = -1 and fr.r_folder_path like '/ChemNet/%'
order by fr.r_folder_path,s.object_name
————————————————————————————-
*** empty folders ***
SELECT r_object_id,r_folder_path FROM dm_folder f WHERE r_object_id NOT IN
(SELECT distinct i_folder_id FROM dm_sysobject WHERE any i_folder_id = f.r_object_id and folder('/content',descend)) and folder('/content',descend)
————————————————————————————-
*** NULL a_effective_date ***
select object_name from dfas_common where folder('/images', descend) and r_object_id NOT IN (select r_object_id from dfas_common where folder('/images', descend) and any a_effective_date is not nulldate)
————————————————————————————-
*** select component from workitem ***
select
r_component_id
from
dmi_package p
where
exists (select r_object_id
from dmi_workitem w
where
w.r_object_id = and
w.r_workflow_id = p.r_workflow_id and
w.r_act_seq_no = p.r_act_seq_no)
————————————————————————————-
*** select renditions ***
SELECT s.object_name, f.dos_extension
FROM dm_dbo.dm_sysobject_s s, dm_dbo.dmr_content_r c, dm_dbo.dm_format_s f
WHERE (c.parent_id = s.r_object_id)
and (c.i_format = f.r_object_id)
AND c.page=0 AND f.dos_extension ‘xml’
AND folder(‘/whatever’)
————————————————————————————-
*** find workflow given document ***
select * from dm_workflow where r_object_id in (select r_workflow_id from dmi_package where any r_component_id in (select r_object_id from
dm_sysobject (all) where i_chronicle_id in (select i_chronicle_id from dm_sysobject where r_object_id=”))) and r_runtime_state=’1′
————————————————————————————-
*** return only inherited attributes ***
SELECT attr_name FROM dmi_dd_attr_info WHERE type_name = ‘my_custom_type’ AND attr_name NOT IN
(SELECT attr_name FROM dmi_dd_attr_info WHERE type_name = ‘dm_document’)
————————————————————————————-
Documents that are uploaded in to docbase b/w Aug 2004 and Oct 2004
select a.r_object_id,a.r_creation_date,a.r_modify_date,b.user_group_name
from dm_document a, dm_user b
where (a.r_creation_date >= Date(’08/01/2004′,’mm/dd/yyyy’) and a.r_creation_date 0
————————————————————————————-
Subject: Why do we create four views for each subtype?
Note: For example the type dm_document has four views:
dm_document_sp
dm_document_sv
dm_document_rp
dm_document_rv
The two _sp and _rp views are used by DQL and the two
_sv and _rv views are used by the Object Manager.
Also, the _sp and _sv views are for single (non-repeating) attributes, while the _rv and _rp views are for repeating attibutes.
————————————————————————————-
Label Text of the either Sytem Type or Custom Type
select label_text from dm_nls_dd_info where parent_id in
(select r_object_id from dm_aggr_domain where type_name = ‘field_type’)
Results:
Content Location
Keywords Category
Business Unit Owner
————————————————————————————-
DQL to list all documents attributes and their associated folder path
select s.object_name, fr.r_folder_path
from dm_document s, dm_sysobject_r sr,
dm_folder_r fr
where s.i_is_deleted = 0
and sr.i_position = -1
and sr.r_object_id = s.r_object_id
and fr.r_object_id = sr.i_folder_id
and FOLDER(‘/ChemNet’, descend)
and fr.r_folder_path like ‘/ChemNet/%’
order by fr.r_folder_path,s.object_name
————————————————————————————-
*** Web cabinet of a content ***
SELECT object_name FROM dm_cabinet
WHERE r_object_id IN (SELECT i_cabinet_id FROM dm_folder
WHERE r_object_id IN (SELECT i_folder_id FROM dm_document (ALL)
WHERE object_name like ‘test%’)) AND r_object_type=’wcm_channel’
OR
select r_object_id, object_name from wcm_channel where r_object_id in
(select i_ancestor_id from dm_folder where r_object_id in
(select i_folder_id from dm_sysobject where object_name = ‘test’))
————————————————————————————-
*** To get the first level folders from the cabinets ***
select object_name from dm_folder where any i_folder_id in (select r_object_id from dm_cabinet where object_name=’Cabinets’)
————————————————————————————-
*** To show the previous Active content ***
select r_object_id,i_chronicle_id,DATETOSTRING(DATE(TODAY),’ddmmyyyy’) as sysdate from dm_document (ALL) where object_name like ‘test%’ and
FOLDER(‘/ChemNet/ChemonicsProcess/Bidding’) and
any r_version_label = ‘Active’
————————————————————————————-
To find the folders for particular group for specified permission
select for write object_name from dm_folder where acl_name IN (select object_name from dm_acl where any r_accessor_name = ‘dm_world’) and folder(‘/ChemNet’,descend)
or
select object_name from dm_folder where acl_name IN (select object_name from dm_acl where any r_accessor_name = ‘dm_world’ and any r_accessor_permit = ’7′) and folder(‘/ChemNet’,descend)
1 – NONE
2 – BROWSE
3 – READ
4 – RELATE
5 – VERSION
6 – WRITE
7 – DELTE
————————————————————————————-
DFC to insert rows into registered table
public static IDfCollection execQuery(String queryString, IDfSession session)
throws DfException{
IDfCollection col = null; //Collection for the result
IDfClientX clientx = new DfClientX();
IDfQuery q = clientx.getQuery(); //Create query object
q.setDQL(queryString); //Give it the query
// example queryString: “insert into dm_dbo.your_registered_table
(field1, [field]) values(,[
col = q.execute(session, IDfQuery.DF_EXEC_QUERY);
System.out.println(“Query executed.”);
return col;
}
————————————————————————————-
How to avoid redundancy for this simple query?
select distinct d.object_name,sys.authors from dm_document d, dm_sysobject_r sys
where folder (‘/xyz/xyz_first’) and
d.r_object_id = sys.r_object_id and
(sys.i_position=-1 or (sys.i_position< =-2 and sys.authors is not null))

Link: http://dionrobin.wordpress.com/2010/02/08/useful-dql-queries/

来源: http://goldengrape.posterous.com/72094659

二.从进门开始
0..绝对不10点以前出现在公司.
1.着装！着装！不管你是去实验室，或者去公司的大楼，在或者是小公司的民宅，或是自己创业的黑作坊；无论是春夏秋冬白天晚上刮风下雨电闪雷鸣台风龙卷风，一个装b的程序员都要十分在意自己着装！这里只提出参考建议。初级装：衬衣+牛仔裤+休闲鞋。中级装：T恤+宽松短裤+拖鞋。高级装：背心+宽松大花裤衩+人字拖。
2.得体的举止。在走廊以及任何形式的过道里，一定要双手插兜，走得像个痞子，至少要看起来有点反社会，如若不行，可走文弱天才型geek路线。。
3.如果有女性在你背后指指点点，小声嘀咕说这一定是一个技术男的时候，应该先低头，然后保持低头状态，缓缓回头，坏坏地蔑笑但是不要出声，然后快步前行。
4.进门后，一定不要跟任何人打招呼，笔直走向自己的位置，最多路过打一杯咖啡，千万不要有多余的动作，显示出自己的专注与心无旁骛。
三.坐下就不要再动了
1.坐下以后，姿势需要略微后仰，能翘着二郎腿最好了，然后在后仰的情况下低着头，以便看到屏幕，然后千万就不要再动了。
2.粗暴地把电脑前的大堆书推开一个口，然后摘下电脑上的一个便签，看一眼，不过3秒，可以开始coding了。
3.能不用IDE就不要用，实在装不了，无论IDE是什么，一定要调成DOS那种黑色背景的。
4.如果写前台界面，就不停地调试后台代码；如果写java，就在里面混编C；如果写C，就在里面混编汇编。不光要coding，还要时不时的翻出一本什么英文的书翻一翻，看不懂就看看插图，然后扔到面前假装懂了继续coding。
5.什么看起来高端就用什么，不要管实用不实用。例如对C++：switch统统重构成多态；如果有指针，统统改成智能的；C++一定要自己写template；数字是全部要替换成宏的名字能起多长就起多长；struct就不要出现了，如果出现，也一定要用__attribute__修饰一下；运算都是位操作的；操作符都是重载的；网络都是并发缓冲线程池的；int只用int32_t声明的;继承不用普通的，什么多继承虚继承啊；helloworld也要写捕获异常的；后人一看代码，中间一堆关键字extern,asm,auto,XXXXX_cast,volatile,explicit,register,template，让一般总在敲int,if,else,for的小程序员顿时心生崇拜。
6.注释？算了吧。只有两个路线可以选：一，变量名起得巨长无比，看代码就和读英文文章一样顺畅，根本不需要加注释。 二，代码无比晦涩，加不加注释根本无影响。
7.千万不要用IM工具交流，千万不要问同事问题，显得自己没有水平，都是自己上网或者查书。
8.无论是同事间开玩笑或者发生任何群体性事件，不要抬头，更不要东张西望，即使地震火灾，也一定要先提交代码再行离开。
四.潇洒地离开
1.人走，主机是千万千万不能关的，至少要跑个daily build，实在不行正在svn提交也勉强算过关。
2.书应该已经又堆到屏幕前了，千万不要整理，明天再来推开。
3.不强求最后一个走，但一定要所有的非程序员，什么市场啊前台啊pm啊都走光了，才可以走。
4.走得时候一定要率性，千万不要收拾任何东西，站起来，出门，好的，就这样。
5.如果今天一定要说句话的话，找到那个最苦逼的程序员，跟他说，你进度太慢了啊，不要老让我等你。

作者：程序猿
来源：http://sighlife.com

10 minute limit on distributed transactions

Running a distributed transaction on Windows XP SP2 that exceeds 10 minutes will cause the transaction to rollback with an ORA-24761 error. The error message is:

Unable to get error message (6107) (0)

The time out defined for the component in Component Services does not matter.

Solution:

If no timeout is specified in the TransactionScope constructor, a transaction has 1 min timeout by default.

This timeout can be overridden in the app.config (or web.config ) by adding following lines.

<system.transactions>
<defaultSettings timeout=”00:30:00″ />
</system.transactions>

Anyway, to prevent too long transactions, a maximum timeout can be specified at machine.config level by setting

<system.transactions>
<machineSettings maxTimeout=”00:30:00″ />
</system.transactions>

If this is not specified explicitely, the maxTimeout has a default value of 10 minutes.

So at the end my code looks like: