Feb07

禁用/启用所有外键约束

Posted in Database, skywalker, 65 views

1、ORACLE数据库中的外键约束名都在表user_constraints中可以查到。其中constraint_type='R'表示是外键约束。

2、启用外键约束的命令为：alter table table_name enable constraint constraint_name

3、禁用外键约束的命令为：alter table table_name disable constraint constraint_name

4、然后再用SQL查出数据库中所以外键的约束名：

select 'alter table '||table_name||' enable constraint '||constraint_name||';' from user_constraints where constraint_type='R'

select 'alter table '||table_name||' disable constraint '||constraint_name||';' from user_constraints where constraint_type='R'

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Feb03

用SQL处理多行汇聚问题

Posted in Database, Program, skywalker, 59 views

表结构如下：
NAME                            Null          Type
------------------------  ---------  -----
N_SEC_CODE                NOT NULL  CHAR(6)
C_RESEARCHER_CODE  NOT NULL  VARCHAR2(20)

此表保存了“股票”与“研究员”的对应关系数据，一般而言，对于同一只股票而言，可能有多个研究员对其进行跟踪研究。所以目前遇到一个要求，需查询出每只股票和对应的研究员（研究员代码间，使用逗号分隔）。

例如有如下数据：
000297                                    chenpeng           
000297                                    liusu             
合并处理后需显示为：
000297                                    chenpeng,liusu

多行数据汇总聚一行，只需要把SQL中“n_sec_code”换为你的用来汇总的列，“c_researcher_code”替换为需合并文本的列，“m_researcher_stock_rel”替换为你的表名

 SELECT n_sec_code,
  TRANSLATE (LTRIM (text, '/'), '*/', '*,') researcherList
   FROM
  (SELECT ROW_NUMBER () OVER (PARTITION BY n_sec_code ORDER BY n_sec_code, lvl DESC) rn,
    n_sec_code                                                                         ,
    text
     FROM
    (SELECT n_sec_code,
      LEVEL lvl       ,
      SYS_CONNECT_BY_PATH (c_researcher_code,'/') text
       FROM
      (SELECT n_sec_code                      ,
        c_researcher_code AS c_researcher_code,
        ROW_NUMBER () OVER (PARTITION BY n_sec_code ORDER BY n_sec_code,c_researcher_code) x
         FROM m_researcher_stock_rel
     ORDER BY n_sec_code,
        c_researcher_code
      ) a CONNECT BY n_sec_code = PRIOR n_sec_code
    AND x - 1                   = PRIOR x
    )
  )
  WHERE rn = 1
ORDER BY n_sec_code;

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Jan25

友好的SecureCRT日志文件设置

Posted in Linux, skywalker, 121 views

SecureCRT可以完整记录下所有信息，但是默认的日志文件设置并不好用。

这里给出我的日志文件配置，遵循以下原则：

1、通过浏览文件名可以获得该日志内容的主要信息
2、文件名唯一
3、每个session的日志独立

由此将Logfilename配置为：%H_%Y%M%D_%h%m_%s%t.log

其中：
%H-主机名或主机IP地址
%Y-四位年份
%M-2位月份
%D-2位日期
%h-2位小时数
%m-2位分钟数
%s-2位秒数
%t-2位毫秒数

最后，在logfile的option中，选中“Start log upon connect” 和 “Append to file”。

自此，所有在SecureCRT中显示过的信息都会如实记录在日志文件中。

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Jan25

可怕的感性与可怕的理性

Posted in View, skywalker, 124 views

本文转载自思华商业模式

前段时间有一则“分贝网CEO因办裸聊网站被捕”的消息，这并不奇怪，“黄，赌，毒”任何时候都是一个足以使人疯狂的诱惑，尤其在正规通道越来越难以为继，越来越需要“心智体美劳”全面发展的时候。

在任何一个全分类浏览文章的网站中，阅读排名靠前的肯定是关乎“性”，“暴乱”，“愤青”等之类的文章，这是人们潜在的超级感性的一面；

探究任何一个存续时间很长的大公司背后，并不是因为他们一直在提供超级感性的东西，而是因为他们一直在努力为顾客提供“超级理性”的东西。

这样，我们将一个事物从诞生到成长过程中，人们感性与理性的变化趋势与效率之间的关系绘制如图：

商业世界的效率在最初都是发迹于感性，当最初的感性退却，进入平淡期，而后是理性的方面。这个模型可以解释很多现象：

比如，呼啦圈的全民热----进入平淡期---只有少数坚持锻炼的人还在呼啦圈；

比如博客的兴起，全民皆博-----渐渐的进入平淡期，更多的人转向更容易的微博-----只有很少的人还在坚持的人写博客；

比如现在很火的微博-----慢慢的只要有最新的，更容易的事物出现，他也会衰退-----剩下一些微博的铁杆粉丝。

比如现在很火的阿凡达-----慢慢最初的热情退却-----只剩下一些超级理性的忠实粉丝。

这给创业者的启示是什么？

  1. 如果你的创业起于满足人们一个简单的感性方面的诉求，那么相对容易的多；
  2. 必须坚持持续的理性引导用户，因为感性的那部分最终是会“离你而去”；
  3. 明白这个变化规律，做好及时应变。
Blogged with the Flock Browser

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Jan22

PowerCmd v2.1 Serial Numbers

Posted in Something, skywalker, 124 views

Name: Flynn1982
S/N:
PCMDA-TU3YB-3TBUY-CADPM
PCMDA-O86AF-6OF8A-CADPM
PCMDA-E56IC-6EC5I-CADPM
PCMDA-MFUU2-UM2FU-CADPM
PCMDA-MQG03-GM3Q0-CADPM
ÐCMDA-J5NBD-NJD5B-CADPM
PCMDA-KTDCK-DKKTC-CADPM
PCMDA-EBHNE-HEEBN-CADPM
PCMDA-N461Y-6NY41-CADPM
PCMDA-5LPZY-P5YLZ-CADPM

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Jan16

Mysql中的STRICT_TRANS_TABLES

Posted in Database, Program, skywalker, 168 views

在调试php symfony，加载fixture数据时，遇到了错误：

SQLSTATE[HY000]: General error: 1366 Incorrect integer value: 'log' for column 'tasklog_id' at row 1

这是因为mysql5.5中默认启用了STRICT_TRANS_TABLES参数。

STRICT_TRANS_TABLES的工作方式：
　　· 对于事务性存储引擎，在语句中任何地方出现的不良数据值均会导致放弃语句并执行回滚。
        · 对于非事务性存储引擎，如果错误出现在要插入或更新的第1行，将放弃语句。（在这种情况下，可以认为语句未改变表，就像事务表一样）。首行后出现的错误不会导致放弃语句。取而代之的是，将调整不良数据值，并给出告警，而不是错误。换句话讲，使用STRICT_TRANS_TABLES后，错误值会导致MySQL执行回滚操作，如果可以，所有更新到此为止。

　　要想执行更严格的检查，请启用STRICT_ALL_TABLES。除了非事务性存储引擎，它与STRICT_TRANS_TABLES等同，即使当不良数据出现在首行后的其他行，所产生的错误也会导致放弃语句。这意味着，如果错误出现在非事务性表多行插入或更新过程的中途，仅更新部分结果。前面的行将完成插入或更新，但错误出现点后面的行则不然。

因此，解决方法就是在my.ini里把STRICT_TRANS_TABLES关掉

?View Code C
#Set the SQL mode to strict
#sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
sql-mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

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Jan04

Enterprise Architect 7 资源

Posted in Database, Program, skywalker, 232 views

Enterprise Architect 7.5 汉化版下载：
http://9.gddx3.crsky.com:808/200907/ha_EnterpriseArchitect-v7.5.843fix.zip

Enterprise Architect 7.5注册码
Name:whitehouse.net.cn
Company:eric
注册码:{67SC0O95-SZPS-LIG2-YQ8Q-8D2N-KWTD-0W6R-TWDD-KT6RB-1J}

 Enterprise Architect 7.1注册码
Name:whitehouse.net.cn
Company:whitehouse.net.cn
注册码:{GLAOMULN-N1F1-EGBC-XN52-9QC6-GJGJ-0W6R-TWDD-KT6RB-SQ}

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Dec25

胜利大逃亡

Posted in Something, skywalker, 114 views

Congratulations! The transfer request for the following domain name(s) has been completed:

DBALIFE.COM

域名转移终于完成了，由edong.com转移到godaddy.com，彻底摆脱通信管理局的控制。

下一步再把万网的域名转移过来。

政府宣传了几千年大禹治水，现在依然只会一刀切，只会干这种万人唾骂的事，谁还记得疏优于堵？

堵吧，不知道最后哭的人是谁。

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Nov23

Chrome Frame导致IE异常

Posted in Something, skywalker, 145 views

访问Google Wave时，被要求安装Chrome Frame插件。

几天后发现IE出现了非常奇怪的问题，google reader的列表全部无法在新窗口打开，页面空白，标题类似：cf:attach_external_tab&71619392&3

这意味着用户只能看google reader里的摘要，而看不到全文

郁闷了好几天，终于发现是Chrome Frame(cf)的问题，将其禁用后，一些正常。

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Nov16

Oracle Trace Level Event Numbers

Posted in Database, skywalker, 236 views

Oracle Trace Level Event Numbers

相关参考信息:

10000 control file debug event, name 'control_file'
10001 control file crash event1
10002 control file crash event2
10003 control file crash event3
10004 control file crash event4
10005 trace latch operations for debugging
10006 testing - block recovery forced
10007 log switch debug crash after new log select, thread %s
10008 log switch debug crash after new log header write, thread %s
10009 log switch debug crash after old log header write, thread %s
10010 Begin Transaction
10011 End Transaction
10012 Abort Transaction
10013 Instance Recovery
10014 Roll Back to Save Point
10015 Undo Segment Recovery
10016 Undo Segment extend
10017 Undo Segment Wrap
10018 Data Segment Create
10019 Data Segment Recovery
10020 partial link restored to linked list (KSG)
10021 latch cleanup for state objects (KSS)
10022 trace ktsgsp
10023 Create Save Undo Segment
10024 Write to Save Undo
10025 Extend Save Undo Segment
10026 Apply Save Undo
10027 latch cleanup for enqueue locks (KSQ)
10028 latch cleanup for enqueue resources (KSQ)
10029 session logon (KSU)
10030 session logoff (KSU)
10031 row source debug event (R*)
10032 sort end (SOR*)
10035 parse SQL statement (OPIPRS)
10036 create remote row source (QKANET)
10037 allocate remote row source (QKARWS)
10038 dump row source tree (QBADRV)
10039 type checking (OPITCA)
10040 dirty cache list
10041 dump undo records skipped
10042 trap error during undo application
10044 free list undo operations
10045 "free list update operations - ktsrsp, ktsunl"
10046 enable SQL statement timing
10047 trace switching of sessions
10048 Undo segment shrink
10049 protect library cache memory heaps
10050 sniper trace
10051 trace OPI calls
10052 don't clean up obj$
10053 CBO Enable optimizer trace
10054 trace UNDO handling in MLS
10055 trace UNDO handing
10056 dump analyze stats (kdg)
10057 suppress file names in error messages
10058 use table scan cost in tab$.spare1
10060 CBO Enable predicate dump
10061 disable SMON from cleaning temp segment
10062 disable usage of OS Roles in osds
10063 disable usage of DBA and OPER privileges in osds
10064 "thread enable debug crash level %s, thread %s"
10065 limit library cache dump information for state object dump
10066 simulate failure to verify file
10067 force redo log checksum errors - block number
10068 force redo log checksum errors - file number
10069 Trusted Oracle test event
10070 force datafile checksum errors - block number
10071 force datafile checksum errors - file number
10072 protect latch recovery memory
10073 have PMON dump info before latch cleanup
10074 default trace function mask for kst
10075 CBO Disable outer-join to regular join conversion
10076 CBO Enable cartesian product join costing
10077 CBO Disable view-merging optimization for outer-joins
10078 CBO Disable constant predicate elimination optimization
10080 dump a block on a segment list which cannot be exchanged
10081 segment High Water Mark has been advanced
10082 free list head block is the same as the last block
10083 a brand new block has been requested from space management
10084 free list becomes empty
10085 free lists have been merged
10086 CBO Enable error if kko and qka disagree on oby sort
10087 disable repair of media corrupt data blocks
10088 CBO Disable new NOT IN optimization
10089 CBO Disable index sorting
10090 invoke other events before crash recovery
10091 CBO Disable constant predicate merging
10092 CBO Disable hash join
10093 CBO Enable force hash joins
10094 before resizing a data file
10095 dump debugger commands to trace file
10096 after the cross instance call when resizing a data file
10097 after generating redo when resizing a data file
10098 after the OS has increased the size of a data file
10099 after updating the file header with the new file size
10100 after the OS has decreased the size of a data file
10101 atomic redo write recovery
10102 switch off anti-joins
10103 CBO Disable hash join swapping
10104 dump hash join statistics to trace file
10105 CBO Enable constant pred trans and MPs w WHERE-clause
10106 CBO Disable evaluating correlation pred last for NOT IN
10107 CBO Always use bitmap index
10108 CBO Don't use bitmap index
10109 CBO Disable move of negated predicates
10110 CBO Try index rowid range scans
10111 Bitmap index creation switch
10112 Bitmap index creation switch
10113 Bitmap index creation switch
10114 Bitmap index creation switch
10115 CBO Bitmap optimization use maximal expression
10116 CBO Bitmap optimization switch
10117 CBO Disable new parallel cost model
10118 CBO Enable hash join costing
10119 QKA Disable GBY sort elimination
10120 CBO Disable index fast full scan
10121 CBO Don't sort bitmap chains
10122 CBO disable count(col) => count(*) transformation
10123 QKA Disable Bitmap And-EQuals
10145 test auditing network errors
10146 enable Oracle TRACE collection
10200 block cleanout
10201 consistent read undo application
10202 consistent read block header
10203 consistent read buffer status
10204 signal recursive extend
10205 row cache debugging
10206 transaction table consistent read
10207 consistent read transactions' status report
10208 consistent read loop check
10209 enable simulated error on control file
10210 check data block integrity
10211 check index block integrity
10212 check cluster integrity
10213 crash after control file write
10214 simulate write errors on control file
10215 simulate read errors on control file
10216 dump control file header
10217 debug sequence numbers
10218 dump uba of applied undo
10219 monitor multi-pass row locking
10220 show updates to the transaction table
10221 show changes done with undo
10222 row cache
10223 transaction layer - turn on verification codes
10226 trace CR applications of undo for data operations
10227 verify (multi-piece) row structure
10228 trace application of redo by kcocbk
10230 check redo generation by copying before applying
10231 skip corrupted blocks on _table_scans_
10232 dump corrupted blocks symbolically when kcbgotten
10233 skip corrupted blocks on index operations
10234 trigger event after calling kcrapc to do redo N times
10235 check memory manager internal structures
10236 library cache manager
10237 simulate ^C (for testing purposes)
10238 instantiation manager
10239 multi-instance library cache manager
10240 dump dba's of blocks that we wait for
10241 dump SQL generated for remote execution (OPIX)
10243 simulated error for test %s of K2GTAB latch cleanup
10244 make tranids in error msgs print as 0.0.0 (for testing)
10245 simulate lock conflict error for testing PMON
10246 print trace of PMON actions to trace file
10247 Turn on scgcmn tracing. (VMS ONLY)
10248 turn on tracing for dispatchers
10249 turn on tracing for multi-stated servers
10250 Trace all allocate and free calls to the topmost SGA heap
10251 check consistency of transaction table and undo block
10252 simulate write error to data file header
10253 simulate write error to redo log
10254 trace cross-instance calls
10256 turn off multi-threaded server load balancing
10257 trace multi-threaded server load balancing
10258 force shared servers to be chosen round-robin
10259 get error message text from remote using explicit call
10260 Trace calls to SMPRSET (VMS ONLY)
10261 Limit the size of the PGA heap
10262 Don't check for memory leaks
10263 Don't free empty PGA heap extents
10264 Collect statistics on context area usage (x$ksmcx)
10265 Keep random system generated output out of error messages
10266 Trace OSD stack usage
10267 Inhibit KSEDMP for testing
10268 Don't do forward coalesce when deleting extents
10269 Don't do coalesces of free space in SMON
10270 Debug shared cursors
10271 distributed transaction after COLLECT
10272 distributed transaction before PREPARE
10273 distributed transaction after PREPARE
10274 distributed transaction before COMMIT
10275 distributed transaction after COMMIT
10276 distributed transaction before FORGET
10277 Cursor sharing (or not) related event (used for testing)
10281 maximum time to wait for process creation
10282 Inhibit signalling of other backgrounds when one dies
10286 Simulate control file open error
10287 Simulate archiver error
10288 Do not check block type in ktrget
10289 Do block dumps to trace file in hex rather than fromatted
10290 kdnchk - checkvalid event - not for general purpose use.
10291 die in dtsdrv to test controlfile undo"
10292 dump uet entries on a 1561 from dtsdrv"
10293 dump debugging information when doing block recovery"
10294 enable PERSISTENT DLM operations on non-compliant systems"
10300 disable undo compatibility check at database open
10301 Enable LCK timeout table consistency check"
10320 Enable data layer (kdtgrs) tracing of space management calls"
10352 report direct path statistics
10353 number of slots
10354 turn on direct read path for parallel query
10355 turn on direct read path for scans
10356 turn on hint usage for direct read
10357 turn on debug information for direct path
10374 parallel query server interrupt (validate lock value)
10375 turn on checks for statistics rollups
10376 turn on table queue statistics
10377 turn off load balancing
10379 direct read for rowid range scans (unimplemented)
10380 kxfp latch cleanup testing event
10381 kxfp latch cleanup testing event
10382 parallel query server interrupt (reset)
10383 auto parallelization testing event
10384 parallel dataflow scheduler tracing
10385 parallel table scan range sampling method
10386 parallel SQL hash and range statistics
10387 parallel query server interrupt (normal)
10388 parallel query server interrupt (failure)
10389 parallel query server interrupt (cleanup)
10390 Trace parallel query slave execution
10391 trace rowid range partitioning
10392 parallel query debugging bits
10393 print parallel query statistics
10394 allow parallelization of small tables
10395 adjust sample size for range table queues
10396 circumvent range table queues for queries
10397 suppress verbose parallel coordinator error reporting
10398 enable timeouts in parallel query threads
10399 use different internal maximum buffer size
10400 turn on system state dumps for shutdown debugging
10500 turn on traces for SMON
10510 turn off SMON check to offline pending offline rollbacksegment
10511 turn off SMON check to cleanup undo dictionary
10512 turn off SMON check to shrink rollback segments
10600 check cursor frame. allocation
10602 cause an access violation (for testing purposes)
10603 cause an error to occur during truncate (for testing purposes)
10604 trace parallel create index
10605 enable parallel create index by default
10606 trace parallel create index
10607 trace index rowid partition scan
10608 trace create bitmap index
10610 trace create index pseudo optimizer
10666 Do not get database enqueue name
10667 Cause sppst to check for valid process ids
10690 Set shadow process core file dump type (Unix only)
10691 Set background process core file type (Unix only)
10700 Alter access violation exception handler
10701 Dump direct loader index keys
10702 Enable histogram data generation
10703 Simulate process death during enqueue get
10704 Print out information about what enqueues are being obtained
10706 Print out information about instance lock manipulation
10707 Simulate process death for instance registration
10708 Print out Tracing information for skxf multi instance comms
10709 enable parallel instances in create index by default
10710 trace bitmap index access
10711 trace bitmap index merge
10712 trace bitmap index or
10713 trace bitmap index and
10714 trace bitmap index minus
10715 trace bitmap index conversion to rowids
10800 disable Smart Disk scan
10801 enable Smart Disk trace
10802 reserved for Smart Disk
10803 write timing statistics on OPS recovery scan
10804 reserved for ksxb
10805 reserved for row source sort
10900 extent manager fault insertion event #%s
10924 import storage parse error ignore event
10925 trace name context forever
10926 trace name context forever
10927 trace name context forever
10928 trace name context forever
10999 do not get database enqueue name

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