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made with multiple FREELISTs On one hand, use of multiple FREELISTs is a huge performance booster On the other hand, it will probably cause the table to use slightly more disk space than absolutely necessary You will have to decide which is less bothersome in your environment Do not underestimate the usefulness of the FREELISTS parameter, especially since you can alter it up and down at will with Oracle 816 and later What you might do is alter it to a large number to perform some load of data in parallel with the conventional path mode of SQL*Loader You will achieve a high degree of concurrency for the load with minimum waits After the load, you can reduce the value to some more reasonable day-to-day number The blocks on the many existing FREELISTs will be merged into the one master FREELIST when you alter the space down.

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indicates that if the ID token, which has no defined precedence, is encountered as look-ahead, the parser will push this token to the parsing stack and shift to state 7. For reduce actions, the rule that is reduced is shown. An error (reject) and accept action is shown for tokens that trigger a syntax error or acceptance, respectively. The parser state extract also provides useful information on conflicts in your grammar. Conflicts arise when your grammar is ambiguous (which translates to having more than one choice for a parser action at any time), ultimately meaning there can be more than one derivation that accepts a given input. You can do a number of things to disambiguate your grammar. You can apply precedence to various tokens or rules or rewrite your rules to be consistent and unambiguous. There are two main sources of grammar conflicts: reduce-reduce and shift-reduce

Another way to solve the previously mentioned issue of buffer busy waits is to use an ASSM managed tablespace If you take the preceding example and create the table T in an ASSM managed tablespace as follows ops$tkyte@ORA11GR2> create tablespace assm 2 datafile size 1m autoextend on next 1m 3 segment space management auto; Tablespace created ops$tkyte@ORA11GR2> create table t ( x int, y char(50) ) tablespace ASSM; Table created you ll find the buffer busy waits, CPU time, and elapsed time to have decreased for this case as well, similar to when we configured the perfect number of FREELISTs for a segment using MSSM without having to figure out the optimum number of required FREELISTs: Snapshot Snap Id Snap Time Sessions Curs/Sess Comment ~~~~~~~~ ---------- ------------------ -------- --------- -----------------Begin Snap: 369 17-Mar-10 12:31:05 22 15 End Snap: 370 17-Mar-10 12:31:25 24 13 Elapsed: 0.

33 (mins) Av Act Sess: 46 DB time: 154 (mins) DB CPU: 108 (mins) Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 65 582 db file async I/O submit 25 17 661 149 log file parallel write 674 11 16 98 log file switch (checkpoint incomplete) 13 4 334 39 buffer busy waits 7,642 4 0 34 This is one of ASSM s main purposes: to remove the need to manually determine the correct settings for many key storage parameters ASSM uses additional space when compared to MSSM in some cases as it attempts to spread inserts out over many blocks, but in most all cases, the nominal extra storage utilized is far outweighed by the decrease in concurrency issues.

conflicts. Reduce-reduce conflicts are considered really bad because there are multiple rules to reduce by at a given situation. Although fsyacc applies a disambiguation strategy (reducing by the grammar rule that was defined earlier), you should really avoid reduce-reduce conflicts as much as possible. Shift-reduce conflicts arise when the parser has the choice to shift a token or reduce by a rule. Unless you fix this conflict, fsyacc favors the shift action and defers the reduction to a later point, which in some situations (for instance, the dangling-else problem) yields the expected behavior, but in general any such conflict is also considered a serious problem.

An environment where storage utilization is crucial and concurrency is not (a data warehouse pops into mind) would not necessarily benefit from ASSM managed storage for that reason..