I do not understand a v$sqlarea statement history

Question

Dears,
I collect a history of SQL statements from Oracle 8i server. I use a statement like
SELECT first_load_time,sql_text FROM v$sqlarea
I get these rows:
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11:23:15 SELECT DocumentID,DocTitul, Documents.ROWID FROM Documents WHERE DocumentID IN (SELECT distinct(DocumentID) FROM StoreHistory WHERE OperationType IN (6,7) AND Status = 'A') AND Status = 'A' AND SafeLevel <= 5 ORDER BY DocTitul
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11:23:15 SELECT DocumentID,DocTitul, Documents.ROWID FROM Documents WHERE DocumentID IN (SELECT distinct(DocumentID) FROM StoreHistory WHERE OperationType IN (:V0001,:V0002) AND Status = 'A') AND Status = 'A' AND SafeLevel <= 5 ORDER BY DocTitul
=======================================================
11:23:15 SELECT DocumentID,DocTitul, Documents.ROWID FROM Documents WHERE DocumentID IN (SELECT distinct(DocumentID) FROM StoreHistory WHERE OperationType IN (6,:V0001) AND Status = 'A') AND Status = 'A' AND SafeLevel <= 5 ORDER BY DocTitul
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I have two questions. Why there are ":V0001" and ":V0002" variables? Can I switch off such behaviour? I need, that there will be exact queries I send to server in the v$sqlarea dynamic view.
Also, I get these rows:
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11:22:47 SELECT COUNT(*) FROM SysRights WHERE ActionPath = 'STORE/EVID' AND Enabled = 1 AND (UserID = 19)
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11:22:47 SELECT COUNT(*), SysRights.ROWID FROM SysRights WHERE ActionPath = 'STORE/EVID' AND Enabled = 1 AND (UserID = 19)
=======================================================
I have another question. Why there is a "SysRights.ROWID" column on the query? Original query with agregate function does not have such column, of course.
Thank you for any information,
Richard
PS: Server (8i) is running on WinNT 4.0. Client (8.0.5[??? I am not sure]) is running on Win2000. Connect string contains "Provider=MSDAORA;".

Answer 1

Richard
:V0001 and :V0002 are bind variables or place holders. They indicate that the query comes from an application (eg Forms) that is using variables to hold values. This behaviour is very useful because it allows the database to reuse parsed queries and stored execution plans for queries with an identical structure. This is very efficient. If you were to switch off the use of bind variables then the database will have to parse and plan each query you send it, which will havw a deleterious affect on performance.
Some of this behaviour you can't override (eg the Forms stuff) but with SQL and PL/SQL you can (in 8.1.6+) by setting this parameter CURSOR_SHARING=EXACT
HTH, APC