performance tuning in oracle 11g with examples

Ngày tải lên: 05/05/2014, 15:42

... found in Appendix A. In addition, you can find the scripts listed on a simple menu on my website at the following URL: 1 www.oracledbaexpert.com /oracle/ OracleSQLJumpstartWithExamples/index.html ... Modeling  Specialized Oracle Database Objects. Clustering, presorting, and physical preconstruction of data. The objective is to avoid repeating the same tasks, targeting and tuning hard-hitting ... queries using simple facets of Oracle SQL such as the DUAL table, DISTINCT, and NULLs. Chapter 5. Filtering Rows This chapter looks at filtering using the WHERE clause, including a brief examination...

Ngày tải lên: 24/12/2013, 12:17

... possible in Oracle SQL with respect to SQL coding can now be coded and executed from within PL/SQL. PL/SQL is now fully syntactically equivalent with Oracle SQL. In other words, all Oracle SQL ... top menu and invoke the editor. A window appears with an editing program and the text of the query you wrote ready for editing. In Windows, the default editor is Note- pad. In UNIX, Linux, and other ... features available for SQL in both Oracle Database 10g and Oracle Database 9i. 1.8 Endnotes 1. www.oracledbaexpert.com /oracle/ secure/Normalization.doc 2. Oracle Performance Tuning for 9i and 10g (ISBN:...

Ngày tải lên: 24/12/2013, 12:17

... particularly when matching indexes or, more specifically, attempting to utilize and take advantage of physical data ordering already available in an index. In Oracle Database 9i, Oracle Database 10g, ... sorts in order of the second column, the third column, and the first column. What’s that in English? PLAYING_TIME by TITLE by RECORDING_DATE or RECORDING_DATE sorted within TITLE, sorted within PLAYING_TIME. ... If the column containing null values is being sorted in descending order, the rows with null values are listed at the beginning. You can reverse either of these rules by using the NULLS FIRST...

Ngày tải lên: 24/12/2013, 12:17

... using scripts and variables. 8.2 Using Scripts and Variables SQL*Plus supports a simple method of defining and prompting for variables using ampersand characters (&). Any string beginning with ... once again. Add the following line: ACCEPT CDNUM PROMPT 'What CD number do you want to see? ' Remove the following lines: DEFINE CDNUM=9 UNDEFINE CDNUM Change the following line from: TTITLE ... formatting, including headings, titles and form feeding.  PAU[SE] . This command only works in SQL*Plus and performs the same type of function as the PAUSE or MORE command in various operating...

Ngày tải lên: 24/12/2013, 12:17

... to join tables or row sets together. Now let’s examine different join types in detail and by example. 10.3 Examining Different Types of Joins Let’s examine each type of join in turn using ... remaining func- tions tend to be obscure and seldom used. In fact, some functions included in this chapter are obscure. Let’s begin with string functions. 9.2.1 String Functions The string ... tables as with an inner join but including rows from one or both tables that do not have matching rows in the other table. Missing values are replaced with null values.  Left outer join. All...

Ngày tải lên: 24/12/2013, 12:17

... MUSIC schema containing songs on other CDs. The self-join query following lists SONG_ID values appearing on more than one CD. Note that the line in the WHERE clause containing the ine- quality operator ... seen.  Windowing Clause. The windowing clause syntax allows placement of a window or subset picture onto a set of data, applying analysis to that data window subset only. In fact, looking at the ... Denormaliza- tion performance improvement. Some examples of situations in which self-joins might be useful would be grouping self-joins or hierarchical (fishhook) self-joins. Note: A fishhook is a table with...

Ngày tải lên: 24/12/2013, 12:17

... ]]]]) . Replaces a string within a string. Regular expression functions are much like their relative Oracle built -in string functions. See Chapter 9 for Oracle built -in string functions. 14.2.2 ... allows flashing back to the state that data was in at a previous point in time. Oracle Database 9 i allowed AS OF flashback queries back to a point in time using a timestamp or SCN. Oracle Database ... let’s look at some simple examples of flashback queries. 13.3.3 Using Flashback Queries First I add a new row to the CONTINENT table. INSERT INTO CONTINENT VALUES(CONTINENT_ID_SEQ.NEXTVAL ,...

Ngày tải lên: 24/12/2013, 12:17

... Pointer Datatypes A reference pointer datatype is used to point to a point in space. Nothing Einsteinian is implied; the space exists only somewhere in an Oracle data- base. The reference pointer ... 324 15.3 Adding Data (INSERT) 15.3 Adding Data (INSERT) Adding new rows into a table is done with the INSERT command. The INSERT command can be used to add to a single table or multiple ... little to do with actually “doing things” to XML structures, with Oracle SQL commands. We want to know the “what” and not the “how.” In other words, what can we do with XML documents in Oracle SQL,...

Ngày tải lên: 24/12/2013, 12:17

... partition containing hash subpartitions within each range partition.  Range-List. A range partition containing list value subpartitions within each range partition. 18.3.6.1.1 Partition Indexing Partitions ... Types 18.3.6 Creating Partitioned Tables Partitioned tables are part and parcel of an add-on option called Oracle Par- titioning. Oracle Partitioning working in concert with parallel processing and separate ... database. The index is shown in Figure 18.6. The query used exam- ines all of a current user’s indexes and is included in Appendix B. DROP TABLE INSTRUMENTS; CREATE TABLE INSTRUMENTS OF INSTRUMENTTYPE OBJECT...

Ngày tải lên: 24/12/2013, 12:17

... An inline primary key constraint on the ARTIST_ID column.  An inline NOT NULL constraint on the NAME column.  An inline CHECK constraint named STATE that checks the length of the STATE_PROVINCE ... are views with joins and views with inline subqueries. 19.3.3.1 Views with Joins Let’s dive right in by creating a complex view that displays artist guest appearances and the instrument ... 20.3 Adding, Modifying, and Dropping Constraints SONGS table. As shown in Figure 20.11, only the primary key on the SONGS table remains. Cascading of constraints can also be applied in the DROP...

Ngày tải lên: 21/01/2014, 18:20

... tables in the FROM clause, and the WHERE clause performs the join. Voilà! A bitmap join index. Now let’s look into changing and dropping indexes. 21.1.4 Changing and Dropping Indexes The indexes ... of indexes.  USER_IND_EXPRESSIONS. Contains function-based index expressions.  USER_JOIN_IND_COLUMNS. Join indexes such as bitmap join indexes.  USER_PART_INDEXES. Index information at the ... column in the index included in the WHERE clause. Consider the columns used in the WHERE clauses whenever adding more indexes to a table.  Skip Scanning Indexes. A new feature introduced in Oracle...

Ngày tải lên: 21/01/2014, 18:20

... about changing data from within PL/SQL blocks. 24.5 Changing Data in PL/SQL Not only can data in tables be changed from within PL/SQL blocks, but there are some small additions making coding a little ... RETURNING INTO clause, as shown in the combined syntax for INSERT, UPDATE, and DELETE commands in Figure 24.10. In general. the RETURNING INTO clause can be used to return expressions used in DML ... to PRINCE using this command: GRANT MUSIC_ACCESS TO PRINCE WITH ADMIN OPTION; Granting a role to a user has the same syntax as granting system privi- leges; therefore, you use the WITH ADMIN OPTION...

Ngày tải lên: 21/01/2014, 18:20

... VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'String'); INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME) VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'Vocals'); INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME) VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'Wind'); INSERT ... watermark. 574 A.5 INSTRUMENT.SQL INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME) VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'Guitar'); INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME) ... VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'Wind'); INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME) VALUES(INSTRUMENT_ID_SEQ.NEXTVAL,NULL,'Orchestra'); INSERT INTO INSTRUMENT(INSTRUMENT_ID,SECTION_ID,NAME)...

Ngày tải lên: 21/01/2014, 18:20

... watermark. Index 647 Index Semicolon (;), 76 Semi-joins. See Subqueries Sequences, 489–498 accessing, 490 changing, 493–94 creating, 490–93 cycling, 492 defined, 489 dropping, 493–94 features, 494 in INSERT ... 411 removing, 411–12 renaming, 411 selecting, 55 unused, 411 updating, 332 See also Rows; Tables Comments adding, 416–20 inline, 419–20 multiple-line, 419 for schema objects, 416–19 single-line, ... 292 using, 290–92 Constraints, 447–69 adding, to existing tables, 462–63 ALTER TABLE command and, 461–64 applying, 449 cascading of, 468 check, 449, 456–58 defined, 448 dropping, 465–68 dropping, with...

Ngày tải lên: 21/01/2014, 18:20

... 411 removing, 411–12 renaming, 411 selecting, 55 unused, 411 updating, 332 See also Rows; Tables Comments adding, 416–20 inline, 419–20 multiple-line, 419 for schema objects, 416–19 single-line, ... 464 renaming, 464–65 states, 463–64 types, 448–49 unique, 448, 451–52 uses, 448–49 USING INDEX clause, 464 Constraint views creating, 429–30 defined, 427 inserted rows requirement, 431 inserting/updating ... 292 using, 290–92 Constraints, 447–69 adding, to existing tables, 462–63 ALTER TABLE command and, 461–64 applying, 449 cascading of, 468 check, 449, 456–58 defined, 448 dropping, 465–68 dropping, with...

Ngày tải lên: 21/01/2014, 18:20

Ngày tải lên: 24/01/2014, 04:20

Ngày tải lên: 24/01/2014, 04:20

Ngày tải lên: 24/01/2014, 04:20

Ngày tải lên: 24/01/2014, 08:20