plsql - Created Temporary Tables Dynamically -


i have scenario like, need create stored procedure in columns come dynamically. based upon columns temporary tables should created. actually, scenario did in sql server , have migrated sql server database oracle.

thanks

if want create table dynamically, you'd need use dynamic sql

begin   execute immediate 'create global temporary table table_name( col1 number, col2 number )'; end;

that being said, mistake directly port sql server code creates temporary tables oracle. not work same way sql server code does.

  • first off, temporary tables in oracle visible every session unlike sql server local session. means if have 2 sessions calling stored procedure, they'd both try create temporary table , second 1 fail (things worse assuming dropping temporary table @ end of procedure rather letting thousands of temporary tables accumulate).
  • creating tables inefficient process in oracle given amount of latching required. oracle's assumption not creating objects on fly. if application violates assumption, encounter scalability issues.
  • if create tables on fly, you'll have refer them on fly. queries against temporary tables need use dynamic sql. less efficient static sql , makes code harder write, harder debug, , harder maintain.

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