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CHAPTER 10 DATABASE TABLES
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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 8.1.6 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. 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 1.5 End Snap: 370 17-Mar-10 12:31:25 24 1.3 Elapsed: 0.33 (mins) Av Act Sess: 4.6 DB time: 1.54 (mins) DB CPU: 1.08 (mins) Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 65 58.2 db file async I/O submit 25 17 661 14.9 log file parallel write 674 11 16 9.8 log file switch (checkpoint incomplete) 13 4 334 3.9 buffer busy waits 7,642 4 0 3.4 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. 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.
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CHAPTER 10 DATABASE TABLES
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PCTFREE and PCTUSED
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In general, the PCTFREE parameter tells Oracle how much space should be reserved on a block for future updates. By default, this is 10 percent. If there is a higher percentage of free space than the value specified in PCTFREE, then the block is considered to be free. PCTUSED tells Oracle the percentage of free space that needs to be present on a block that is not currently free in order for it to become free again. The default value is 40 percent. As noted earlier, when used with a table (but not an IOT, as we ll see), PCTFREE tells Oracle how much space should be reserved on a block for future updates. This means if we use an 8KB block size, as soon as the addition of a new row onto a block causes the free space on the block to drop below about 800 bytes, Oracle will use another block from the FREELIST instead of the existing block. This 10 percent of the data space on the block is set aside for updates to the rows on that block.
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Note PCTFREE and PCTUSED are implemented differently for different table types. Some table types employ
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both, whereas others only use PCTFREE, and even then only when the object is created. IOTs use PCTFREE upon creation to set aside space in the table for future updates, but do not use PCTFREE to decide when to stop inserting rows into a given block, for example.
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The exact effect of these two parameters varies depending on whether you are using ASSM or MSSM tablespaces. When you are using MSSM, these parameter settings control when the block will be put on and taken off the FREELIST. If you are using the default values for PCTFREE (10) and PCTUSED (40), then a block will remain on the FREELIST until it is 90 percent full (10 percent free space). Once it hits 90 percent, it will be taken off the FREELIST and remain off the FREELIST until the free space on the block exceeds 60 percent of the block. When you are using ASSM, PCTFREE still limits if a new row may be inserted into a block, but it does not control whether a block is on a FREELIST or not, as ASSM does not use FREELISTs at all. In ASSM, PCTUSED is simply ignored. There are three settings for PCTFREE: too high, too low, and just about right. If you set PCTFREE for blocks too high, you will waste space. If you set PCTFREE to 50 percent and you never update the data, you have just wasted 50 percent of every block. On another table, however, 50 percent may be very reasonable. If the rows start out small and tend to double in size, setting PCTFREE too small will cause row migration as you update the rows.
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