Oracle PL/SQL Programming, 2nd Edition

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C.13 DBMS_SNAPSHOT

The DBMS_SNAPSHOT package provides a programmatic interface through which you can manage snapshots and purge snapshot logs. For detailed information about snapshots (read-only copies of tables), see Chapter 16 in the Oracle7 Server Administrator Guide .

C.13.1 The DROP_SNAPSHOT procedure

This procedures drops the specified snapshot. The specification is:

PROCEDURE DBMS_SNAPSHOT.DROP_SNAPSHOT
 (mowner VARCHAR2,
 master VARCHAR2,
 snapshot DATE);

C.13.2 The GET_LOG_AGE procedure

This procedures gets the oldest date entry in the log. The specification is:

PROCEDURE DBMS_SNAPSHOT.GET_LOG_AGE
 (oldest IN OUT date,
 mow VARCHAR2,
 mas VARCHAR2);

C.13.3 The PURGE_LOG procedure

This procedure purges the specified log of any unnecessary rows. The specifications are:

PROCEDURE DBMS_SNAPSHOT.PURGE_LOG
 (master VARCHAR2,
 num NUMBER);
PROCEDURE DBMS_SNAPSHOT.PURGE_LOG
 (master VARCHAR2,
 num NUMBER,
 flag VARCHAR2);

C.13.4 The REFRESH procedure

This procedure causes a manual refresh of the snapshot. The procedure is overloaded so that you can specify an optional refresh option. The specifications are:

PROCEDURE DBMS_SNAPSHOT.REFRESH (snapshot VARCHAR2);
PROCEDURE DBMS_SNAPSHOT.REFRESH
 (snapshot VARCHAR2,
 op VARCHAR2);

C.13.5 The REFRESH_ALL procedure

This procedure causes a refresh of all snapshots waiting to be refreshed automatically. The specification is:

PROCEDURE DBMS_SNAPSHOT.REFRESH_ALL;

C.13.6 The SET_UP procedure

This procedure prepares the specified master site to refresh a snapshot. The specification is:

PROCEDURE DBMS_SNAPSHOT.SET_UP
 (mowner VARCHAR2,
 master VARCHAR2,
	 log IN OUT VARCHAR2,
 snapshot IN OUT date,
 snaptime IN OUT date);

C.13.7 The WRAP_UP procedure

The WRAP_UP procedure records a refresh at the master site. The specification is:

PROCEDURE DBMS_SNAPSHOT.WRAP_UP
 (mowner VARCHAR2,
 master VARCHAR2,
 sshot DATE,
 stime DATE);

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