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Optimizer hints are an interesting feature of Oracle. On one hand, the documentation goes out of its way to tell you to use them sparingly, but on the other hand, you can choose from more than 60 hints in 10g and more than 70 in 11g (64 and 71, to be precise). That’s a lot to choose from, and even with a decent working knowledge of them, you probably cannot accurately describe more than 15 to 20 of them. You would be correct to assume that the hints are categorized, but even with that assumption, can you name the categories? If not by the category name Oracle uses, then if asked about different tuning or usage scenarios, a moderately experienced DBA can hit upon the purpose or function of a category. These questions aren’t meant to be “Trivia Pursuit, the Oracle edition,” but rather, a means to identify and clarify some aspects of optimizer hints. The optimizer goals are also values for the OPTIMIZER_MODE initialization parameter, so there is a minor bit of crossover between a statement-level hint and a system-level setting.

The table below shows the hints (from 11g) by category and name (and number). Italicized and asterisked (and red if reading on the Web) hints are deprecated and are not counted in the 71 mentioned earlier. Bold font hints are new in 11g, and RULE is no longer supported.

During business hours, this database is being slammed with log file switches. What generates input into the redo logs? Biochemical Test Of Bacteria Pdf: Full Version Free Software Download on this page. Not only DML on tables, but also what takes place with indexes, that is, index maintenance. The investigative path, so far, started with a report. In actuality, it could have started with complaints from users about an application being slow, or appearing to have become slower lately. There was a big number for a common event.

The big number by itself doesn’t necessarily mean anything until it is put into context with related events, items, or statistics. Sequential read and heavy redo log switching frequency sounds like there could be a problem with too many indexes being used, or used in the sense that redundant indexes are also being updated along with the essential or set-covering ones. To confirm this hypothesis, we need to look at the SQL statements, and this is where we come back to the use of hints. In SQL ordered by Gets, the top lines bear investigating. Using the INDEX (table name or alias, or indexspec) hint, now formally knowing it is an access path hint, is based on what knowledge? That you want to tell Oracle to do what it wants to do in the first place (find the best execution plan for you) or tell Oracle that it must use an index (if it exists) when, in fact, a full table scan would be more efficient?

Or consider this: some developer is coding in index hints that are essentially useless. Case in point: explain plans with and without an index hint are shown below. Base table is MY_OBJECTS, which is a CTAS from ALL_OBJECTS (and table is analyzed after creating an index name IDX_MY_OBJ). SQL>explain plan for 2 select /*+ index (a) */ 3 object_name 4 from my_objects a 5 where object_type = 'INDEXTYPE'; Explained.