i work with sql server, but i must migrate to an application with Oracle DB. for trace my application queries, in Sql Server i use wonderful Profiler tool. is there something of equivalent for Oracle?
11 Answers
You can use The Oracle Enterprise Manager to monitor the active sessions, with the query that is being executed, its execution plan, locks, some statistics and even a progress bar for the longer tasks.
See: http://download.oracle.com/docs/cd/B10501_01/em.920/a96674/db_admin.htm#1013955
Go to Instance -> sessions and watch the SQL Tab of each session.
There are other ways. Enterprise manager just puts with pretty colors what is already available in specials views like those documented here: http://www.oracle.com/pls/db92/db92.catalog_views?remark=homepage
And, of course you can also use Explain PLAN FOR, TRACE tool and tons of other ways of instrumentalization. There are some reports in the enterprise manager for the top most expensive SQL Queries. You can also search recent queries kept on the cache.
Oracle, along with other databases, analyzes a given query to create an execution plan. This plan is the most efficient way of retrieving the data.
Oracle provides the 'explain plan' statement which analyzes the query but doesn't run it, instead populating a special table that you can query (the plan table).
The syntax (simple version, there are other options such as to mark the rows in the plan table with a special ID, or use a different plan table) is:
explain plan for <sql query>
The analysis of that data is left for another question, or your further research.
This is an Oracle doc explaining how to trace SQL queries, including a couple of tools (SQL Trace and tkprof)
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