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A row may have changed several times during its life Flashback Versions Query lets you see all the committed versions of a row (but not any uncommitted versions), including the timestamps for when each version was created and when it ended You can also see the transaction identifier of the transaction that created any given version of a row, which can then be used with Flashback Transaction Query This information is exposed by a number of pseudocolumns that are available with every table Pseudocolumns are columns appended to the row by Oracle internally: they are not part of the ISO standards for a relational database, but they can be very useful One pseudocolumn is the row ID: the unique identifier for every row in the database, that is used in indexes as the pointer back to the table The pseudocolumns relevant to flashback are VERSIONS_STARTSCN The SCN at which this version of the row was created, either by INSERT or by UPDATE VERSIONS_STARTTIME created The timestamp at which this version of the row was rdlc pdf 417 PDF417 Barcode Creating Library for RDLC Reports | Generate ...
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NET web & IIS applications; Easy to draw & create 2D PDF - 417 barcode images in jpeg, gif, png and bitmap files; Able to generate & print PDF - 417 in RDLC ... VERSIONS_ENDSCN The SCN at which this version of the row expired, because of either DELETE or UPDATE VERSIONS_ENDTIME The timestamp at which this version of the row expired VERSIONS_XID The unique identifier for the transaction that created this version of the row VERSIONS_OPERATIONS The operation done by the transaction to create this version of the row, either INSERT or UPDATE or DELETE To see these pseudocolumns, you must include the VERSIONS BETWEEN keywords in your query For example, Figure 19-6 shows all versions of the row for employee 8000 Figure 19-6 rdlc pdf 417 PDF - 417 Client Report RDLC Generator | Using free sample for PDF ...
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Barcode Control SDK supports generating Data Matrix, QR Code, PDF - 417 barcodes in RDLC Local Report using VB and C# class library both in ASP.NET and ... The versions are sorted in descending order of existence: they must be read from the bottom up The bottom row shows that employee 8000 was inserted (the I in the last column) at SCN 95828152 by transaction number 01000E0002180000 The employee was given the ENAME of RAMKLASS and the SAL of 3000 This version of the row existed until SCN 95828273, which takes us to the third row At this SCN, the row was updated (the U in the last column) with a new salary This version of the row persisted until SCN 95828279, when it was deleted, as shown in the second row The VERSIONS_ENDSCN column is always null for a deletion The top row of the result set shows a new insertion, which reuses the employee number For this row, the VERSIONS_ENDSCN is also null, because the row still exists, in that version, as at the end of the time range specified in the query In the example in Figure 19-6, the VERSIONS BETWEEN clause uses two constants for the SCN MINVALUE instructs Oracle to retrieve the earliest information in the undo segments; MAXVALUE will be the current SCN In other words, the query as written will show all versions that can possibly be retrieved, given the information available The syntax will also accept a range specified with two timestamps: SQL> select empno,ename,sal,versions_xid,versions_starttime, versions_endtime,versions_operation from emp versions between timestamp (systimestamp - 1/24) and systimestamp where empno=8000; The preceding example will select all versions of employee number 8000 that existed during the last hour EXAM TIP Flashback Version Query cannot work against external tables, temporary tables, or V$ views Why not Because none of these objects generates undo For more information about the web-safe palette s lack of safeness under the 15- and 16-bit color modes, access an article in WebMonkey online, written by David Lehn and Hadley Stern: http://hotwiredlycoscom/webmonkey/00/37/index2ahtml Flashback Table Query and Flashback Versions Query use undo data for an object Flashback Transaction Query analyzes the undo by a different dimension: it will retrieve all the undo data for a transaction, no matter how many objects it affects The critical view is FLASHBACK_TRANSACTION_QUERY, described here: ocp11g> describe flashback_transaction_query Name Null ----------------------------------- -------XID START_SCN START_TIMESTAMP COMMIT_SCN COMMIT_TIMESTAMP LOGON_USER UNDO_CHANGE# OPERATION TABLE_NAME TABLE_OWNER ROW_ID UNDO_SQL Type --------------------RAW(8) NUMBER DATE NUMBER DATE VARCHAR2(30) NUMBER VARCHAR2(32) VARCHAR2(256) VARCHAR2(32) VARCHAR2(19) VARCHAR2(4000) Because the data in this view may be sensitive, it is protected by a privilege: you must be granted SELECT ANY TRANSACTION before you can query it By default, this privilege is granted to SYS and to the DBA role There will be one or more rows in this view for every transaction whose undo data still exists in the undo segments, and every row will refer to one row affected by the transaction The table that follows describes the columns
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