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In the past, Oracle always decided the point in time at which our queries would be consistent. That is, Oracle made it such that any resultset we opened would be current with respect to one of two points in time: The point in time the query was opened. This is the default behavior in READ COMMITTED isolation (we ll be covering the differences between READ COMMITTED, READ ONLY, and SERIALIZABLE transaction levels in 7 Concurrency and Multi-versioning ). The point in time the transaction that the query is part of began. This is the default behavior in READ ONLY and SERIALIZABLE transaction levels.

Some cells in the Values area are empty, and you d prefer they contain a zero or a couple of dashes. This example is based on the Regions.xlsx workbook.

Starting with Oracle 9i s flashback query feature, however, we can tell Oracle to execute a query as of (with certain reasonable limitations on the length of time you can go back into the past, of course). With this, you can see read consistency and multi-versioning even more directly.

return SQLITE_OK;

Note The flashback data archive, used for long-term flashback queries (months or years into the past) and

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available with Oracle 11g Release 1 and above, does not use read consistency and multi-versioning to produce the version of data that was in the database at some prior point in time. Instead, it uses before-image copies of records it has placed into the archive. We ll come back to the flashback data archive in a later chapter.

You can change the PivotTable Options and display any number or character, in a Values cell where there is no data: 1. Right-click a cell in the pivot table, and in the context menu, click PivotTable Options. 2. On the Layout & Format tab, add a check mark to For Empty Cells, Show and, in the text box, type a zero (see Figure 4-10). Click OK to close the dialog box.

Consider the following example. We start by getting an SCN (System Change or System Commit number; the terms are interchangeable). This SCN is Oracle s internal clock: every time a commit occurs, this clock ticks upward (increments). We could use a date or timestamp as well, but here the SCN is readily available and very precise: scott%ORA11GR2> variable scn number scott%ORA11GR2> exec :scn := dbms_flashback.get_system_change_number; PL/SQL procedure successfully completed. scott%ORA11GR2> print scn SCN ---------6294346

The first thing the authorizer looks for is a change in transaction state. If it finds a change, it prints a message: if((a != NULL) && (type == SQLITE_TRANSACTION)) { printf(": %s Transaction", operation); } Next the authorizer filters events that result in a schema change: switch(type) { case SQLITE_CREATE_INDEX: case SQLITE_CREATE_TABLE: case SQLITE_CREATE_TRIGGER: case SQLITE_CREATE_VIEW: case SQLITE_DROP_INDEX: case SQLITE_DROP_TABLE: case SQLITE_DROP_TRIGGER: case SQLITE_DROP_VIEW: { // Schema has been modified somehow. printf(": Schema modified"); } The next filter looks for read attempts (which are fired on a column-by-column basis). Here, all read attempts are allowed unless the column name is z, in which case the function returns SQLITE_IGNORE. This will cause SQLite to return NULL for any field in column z, effectively blocking access to its data. if(type == SQLITE_READ) { printf(": Read of %s.%s ", a, b); /* Block attempts to read column z */ if(strcmp(b,"z")==0) { printf("-> DENIED\n"); return SQLITE_IGNORE; }

Note The DBMS_FLASHBACK package might have restricted access on your system. I granted execute on this

We got the SCN so we can tell Oracle the point in time we d like to query as of. We want to be able to query Oracle later and see what was in this table at this precise moment in time. First, let s see what is in the EMP table right now: scott%ORA11GR2> select count(*) from emp; COUNT(*) ---------14 Now let s delete all of this information and verify that it s gone : scott%ORA11GR2> delete from emp; 14 rows deleted. scott%ORA11GR2> select count(*) from emp; COUNT(*) ---------0

You re sending your pivot table to a colleague, and you want to hide some of the buttons and filter drop-downs in the pivot table before you send it. Your colleague isn t too familiar with pivot tables, and you want to make it look as simple and uncluttered as possible. This example is based on the Regions.xlsx workbook.

Next come insert and update filters. All insert statements are allowed. However, update statements that attempt to modify column x are denied. This will not block the update statement from executing; rather, it will simply filter out any attempt to update column x. if(type == SQLITE_INSERT) { printf(": Insert records into %s ", a); } if(type == SQLITE_UPDATE) { printf(": Update of %s.%s ", a, b);

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