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As usual with arithmetic operators, division and multiplication should take precedence over addition and subtraction, so 1+2*3 should be parsed as 1+(2*3). With fsyacc this can be expressed easily using the associativity directives or, to be more precise, their ordering: // Associativity and Precedences - Lowest precedence comes first %left PLUS MINUS %left TIMES By specifying what tokens associate and where (how strongly they bind), you can control how parse derivations are performed. For instance, giving left-associativity to the addition operator (PLUS), given an input 1+2+3, the parser will automatically generate a nonambiguous derivation in the form of (1+2)+3. The basic arithmetic operators are left-associative and should be listed from the lowest precedence to the highest; in our example, the addition and subtraction operators have lower precedence than multiplication the way it should be. Other associativity specifications include %nonassoc and %right, which are used to denote that a given symbol does not associate or associates to the right, respectively. The former is useful for relational and equality operators such as <, >, or !=, where the operator is not applicable if applied multiple times, so 1 > 2 > 3 would yield a syntax error. You can also give precedence to a rule by using %prec at the end of the rule and giving a token whose precedence is to be applied. You can list arbitrary tokens in the associativity and precedence declarations, even if they have not been declared as tokens, and use them in such situations. You can find more details on specifying precedence at http://www.expert-fsharp.com/ Topics/FsYacc.

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ops$tkyte@ORA11GR2> create table t ( x int, y char(50) ) 2 storage ( freelists 5 ) tablespace MSSM; Table created or by altering the object ops$tkyteORA11GR2> alter table t storage ( FREELISTS 5 ); Table altered You will find that the buffer busy waits goes way down, and the amount of CPU needed (since you are doing less work here; competing for a latched data structure can really burn CPU) also goes down along with the elapsed time: Snapshot Snap Id Snap Time Sessions Curs/Sess Comment ~~~~~~~~ ---------- ------------------ -------- --------- -----------------Begin Snap: 367 17-Mar-10 12:26:50 24 13 End Snap: 368 17-Mar-10 12:27:09 22 15 Elapsed: 032 (mins) Av Act Sess: 43 DB time: 137 (mins) DB CPU: 098 (mins) Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 59 59.

9 db file async I/O submit 28 15 536 153 log file parallel write 752 10 13 98 buffer busy waits 17,929 5 0 54 cursor: pin S 252 3 11 29 What you want to do for a table is try to determine the maximum number of concurrent (truly concurrent) inserts or updates that will require more space What I mean by truly concurrent is how often you expect two people at exactly the same instant to request a free block for that table This is not a measure of overlapping transactions; it is a measure of how many sessions are doing inserts at the same time, regardless of transaction boundaries You want to have about as many FREELISTs as concurrent inserts into the table to increase concurrency.

Tip One useful option for fsyacc.exe is -v, which causes fsyacc to produce a readable extract of the

You should just set FREELISTs really high and then not worry about it, right Wrong of course, that would be too easy When you use multiple FREELISTs, there is a master FREELIST and there are process FREELISTs If a segment has a single FREELIST, then the master and process FREELISTs are one and the same thing If you have two FREELISTs, you ll really have one master FREELIST and two process FREELISTs A given session will be assigned to a single process FREELIST based on a hash of its session ID Now, each process FREELIST will have very few blocks on it the remaining free blocks are on the master FREELIST As a process FREELIST is used, it will pull a few blocks from the master FREELIST as needed.

If the master FREELIST cannot satisfy the space requirement, then Oracle will advance the HWM and add empty blocks to the master FREELIST So, over time, the master FREELIST will fan out its storage over the many process FREELISTs (again, each of which has only a few blocks on it) So, each process will use a single process FREELIST It will not go from process FREELIST to process FREELIST to find space This means that if you have ten process FREELISTs on a table and the one your process is using exhausts the free buffers on its list, it will not go to another process FREELIST for space so even if the other nine process FREELISTs have five blocks each (45 blocks in total), it will go to the master FREELIST.

Each state in this extract corresponds to one or more items, which are productions that indicate what has been seen while parsing them. This current position with respect to a rule is marked with a period (.). Furthermore, to each state belongs various actions that are triggered by certain look-ahead symbols. For instance, the action in some state as follows: action 'ID' (noprec): shift 7

Assuming the master FREELIST cannot satisfy the request for a free block, it would cause the table to advance the HWM or, if the table s HWM cannot be advanced (all the space is used), to extend (to get another extent) It will then continue to use the space on its FREELIST only (which is no longer empty) There is a tradeoff to be.