BBB information on how to use the table to update AAA table of data (associated field)
Related Posts of BBB information on how to use the table to update AAA table of data (associated field)
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Set oracle query is not case sensitive
(The following only in the "=" was the case of the entry into force, LIKE not work.) Sometimes we do not want to check the time and other functions through the lower or upper case and put out the contents of all queries, such as from sqlser ...
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[Change] Oracle data types and storage methods
Oracle data types and storage methods Yuan Guangdong Original http://www.javaeye.com/topic/220760 Overview by example, comprehensive and in-depth analysis oralce the basic data types and their storage methods. ORACLE 10G basis in order to introduce o ...
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ORACLE used a fool question 1000 Q (3)
73. How do I back up one or more separate tables? exp user / password tables = (table 1, ..., table 2) 74. How do I back up a single or multiple users? exp system / manager owner = (User 1, user 2, ..., user n) file = Export File 75. How to CLOB fiel ...
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Calculate a table the size of the space occupied by
select owner, table_name, NUM_ROWS, BLOCKS * AAA/1024/1024 "Size M", EMPTY_BLOCKS, LAST_ANALYZED from dba_tables where table_name = 'XXX'; Here: AAA is the value of db_block_size; XXX is the table name you want to check
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ORACLE used a fool question 1000 Q (6)
187. / * + ADD_EQUAL TABLE INDEX_NAM1, INDEX_NAM2 ,...*/ Tip a clear plan for the implementation of the choice of several separate index scan together. For example: SELECT / * + INDEX_FFS (BSEMPMS IN_DPTNO, IN_EMPNO, IN_SEX) * / * FROM BSEMPMS WHERE ...
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tnsping command
Reply from AAA.BBB.CCC.DDD: bytes = 32 time <10ms TTL = 255 The above example shows the first 40 milliseconds ping time of need, which include DNS resolution time. From the above description we can conclude that: 1. tnsping need to use TCP, it nee ...
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summary of the usage of oracle hints
1. / * + ALL_ROWS * / Show that the choice to block the optimization method based on cost and get the best throughput to minimize consumption of resources. For example: SELECT / * + ALL + _ROWS * / EMP_NO, EMP_NAM, DAT_IN FROM BSEMPMS WHERE EMP_NO = ...
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SQL Optimization of the process of common usage of Oracle HINT
SQL statement in the optimization process, we often use hint, is to sum up the process in the SQL optimization Oracle HINT common usage: 1. / * + ALL_ROWS * / Show that the choice to block the optimization method based on cost and get the best throug ...
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SQL optimization process in common use Oracle HINT
SQL statement in the optimization process, we often use hint, is to sum up the process in the SQL optimization Oracle HINT common usage: 1. / * + ALL_ROWS * / Show that the choice to block the optimization method based on cost and get the best throug ...
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Common usage of Oracle HINT
rnrnrnrnrn rn 1. / * + ALL_ROWS * / That right block select cost-based optimization method, and get the best throughput, so that resource consumption minimized. For example: SELECT / * + ALL + _ROWS * / EMP_NO, EMP_NAM, DAT_IN FROM BSEMPMS WHERE EMP_ ...













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