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management routines are very different; the same operations executed against a table in ASSM and MSSM may well result in different physical order. The data will logically be the same, but it will be stored in different ways.

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A full scan of the table will retrieve the data as it hits it, not in the order of insertion This is a key concept to understand about database tables: in general, they are inherently unordered collections of data You should also note that I do not need to use a DELETE in order to observe this effect; I could achieve the same results using only INSERTs If I insert a small row, followed by a very large row that will not fit on the block with the small row, and then a small row again, I may very well observe that the rows come out by default in the order small row, small row, large row They will not be retrieved in the order of insertion Oracle will place the data where it fits, not in any order by date or transaction.

parser combinators. The idea is very much the same as the combinators presented here; parsing is described using a compositional set of functions. You also can write parser combinators using the workflow notation described in 9.

If your query needs to retrieve data in order of insertion, you must add a column to the table that you can use to order the data when retrieving it This column could be a number column, for example, maintained with an increasing sequence (using the Oracle SEQUENCE object) You could then approximate the insertion order using a SELECT that did an ORDER BY on this column It will be an approximation because the row with sequence number 55 may very well have committed before the row with sequence 54, therefore it was officially first in the database You should think of a heap organized table as a big unordered collection of rows These rows will come out in a seemingly random order, and depending on other options being used (parallel query, different optimizer modes, and so on), they may come out in a different order with the same query.

Do not ever count on the order of rows from a query unless you have an ORDER BY statement on your query! That aside, what is important to know about heap tables Well, the CREATE TABLE syntax spans some 72 pages in the SQL Reference Manual provided by Oracle, so there are lots of options that go along with them There are so many options that getting a hold on all of them is pretty difficult The wire diagrams (or train track diagrams) alone take 18 pages to cover One trick I use to see most of the options available to me in the CREATE TABLE statement for a given table is to create the table as simply as possible, for example: ops$tkyte@ORA11GR2> create table t 2 ( x int primary key, 3 y date, 4 z clob 5 ) 6 / Table created.

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Then, using the standard supplied package DBMS_METADATA, I query the definition of it and see the verbose syntax: ops$tkyte%ORA11GR2> select dbms_metadataget_ddl( 'TABLE', 'T' ) from dual; DBMS_METADATAGET_DDL('TABLE','T') -----------------------------------------------------------------------------CREATE TABLE "OPS$TKYTE""T" ( "X" NUMBER(*,0), "Y" DATE, "Z" CLOB, PRIMARY KEY ("X") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 NOCOMPRESS LOGGING TABLESPACE "USERS" ENABLE ) SEGMENT CREATION DEFERRED PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING TABLESPACE "USERS" LOB ("Z") STORE AS BASICFILE ( TABLESPACE "USERS" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION NOCACHE LOGGING ).

The nice thing about this trick is that it shows many of the options for my CREATE TABLE statement I just have to pick data types and such; Oracle will produce the verbose version for me I can now customize this verbose version, perhaps changing the ENABLE STORAGE IN ROW to DISABLE STORAGE IN ROW, which would disable the storage of the LOB data in the row with the structured data, causing it to be stored in another segment I use this trick myself all of the time to avoid having to decipher the huge wire diagrams I also use this technique to learn what options are available to me on the CREATE TABLE statement under different circumstances.