Using GUIDs : Performance of Indexes/Queries?

Hi,
We are building a new database. The database tables is coupled together with key values which are GUIDs. The database size may grow to in excess of 2Billion records in a few months.
I am not sure here about how would Oracle Indexes perform given the very random nature of values of GUIDs. If I create an Index on a GUID column, would Oracle really use the Index when I have queries with the GUIDs in the where clause? Or would it do a full table scan for those millions of rows? Please let me know your views.
If anyone know of some best practices surrounding GUIDs or some good article on using GUIDs and possible issues associated with that, how to plan such huge database with keys with are GUIDs in nature, etc.., then even that would help me out.
Thanks a lot!
Biren.

Hi Biren,
By GUID, are you referring to the Oracle Portal product?

Similar Messages

Bad INSERT performance when using GUIDs for indexes

Hi,
we use Ora 9.2.0.6 db on Win XP Pro. The application (DOT.NET v1.1) is using ODP.NET. All PKs of the tables are GUIDs represented in Oracle as RAW(16) columns.
When testing with mass data we see more and more a problem with bad INSERT performance on some tables that contain many rows (~10M). Those tables have an RAW(16) PK and an additional non-unique index which is also set on a RAW(16) column (both are standard B*tree). An PerfStat reports tells that there is much activity on the Index tablespace.
When I analyze the related table and its indexes I see a very very high clustering factor.
Is there a way how to improve the insert performance in that case? Use another type of index? Generally avoid indexed RAW columns?
Please help.
Daniel

Hi
After my last tests I conclude at the followings:
The query returns 1-30 records
Test 1: Using Form Builder
- Execution time 7-8 seconds
Test 2: Using Jdeveloper/Toplink/EJB 3.0/ADF and Oracle AS 10.1.3.0
- Execution time 25-27 seconds
Test 3: Using JDBC/ADF and Oracle AS 10.1.3.0
- Execution time 17-18 seconds
When I use:
session.setLogLevel(SessionLog.FINE) and
session.setProfiler(new PerformanceProfiler())
I don’t see any improvement in the execution time of the query.
Thank you
Thanos

Which Event Classes i should use for finding good indexs and statistics for queries in SP.

Dear all,
I am trying to use pro filer to create a trace,so that it can be used as workload in
"Database Engine Tuning Advisor" for optimization of one stored procedure.
Please tel me about the Event classes which i should use in trace.
The stored proc contains three insert queries which insert data into a table variable,
Finally a select query is used on same table variable with one union of the same table variable, to generate a sequence for records based on certain condition of few columns.
There are three cases where i am using the above structure of the SP, so there are three SPS out of three , i will chose one based on their performance.
1) There is only one table with three inserts which gets into a table variable with a final sequence creation block.
2) There are 15 tables with 45 inserts , which gets into a tabel variable with a final
sequence creation block.
3)
There are 3 tables with 9 inserts , which gets into a table variable with a final
sequence creation block.
In all the above case number of record will be around 5 lacks.
Purpose is optimization of queries in SP
like which Event Classes i should use for finding good indexs and statistics for queries in SP.
yours sincerely

"Database Engine Tuning Advisor" for optimization of one stored procedure.
Please tel me about the Event classes which i should use in trace.
You can use the "Tuning" template to capture the workload to a trace file that can be used by the DETA. See
http://technet.microsoft.com/en-us/library/ms190957(v=sql.105).aspx
If you are capturing the workload of a production server, I suggest you not do that directly from Profiler as that can impact server performance. Instead, start/stop the Profiler Tuning template against a test server and then script the trace
definition (File-->Export-->Script Trace Definition). You can then customize the script (e.g. file name) and run the script against the prod server to capture the workload to the specified file. Stop and remove the trace after the workload
is captured with sp_trace_setstatus:
DECLARE @TraceID int = <trace id returned by the trace create script>
EXEC sp_trace_setstatus @TraceID, 0; --stop trace
EXEC sp_trace_setstatus @TraceID, 2; --remove trace definition
Dan Guzman, SQL Server MVP, http://www.dbdelta.com

Select query performance improvement - Index on EDIDC table

Hi Experts,
I have a scenario where in I have to select data from the table EDIDC. The select query being used is given below.
SELECT docnum
          direct
          mestyp
          mescod
          rcvprn
          sndprn
          upddat
          updtim
INTO CORRESPONDING FIELDS OF TABLE t_edidc
FROM edidc
FOR ALL ENTRIES IN t_error_idoc
WHERE
upddat GE gv_date1 AND
upddat LE gv_date2 AND
updtim GE p_time AND
status EQ t_error_idoc-status.
As the volume of the data is very high, our client requested to put up some index or use an existing one to improve the performance of the data selection query.
Question:
4.    How do we identify the index to be used.
5.    On which fields should the indexing be done to improve the performance (if available indexes donu2019t cater to our case).
6.    What will be the impact on the table performance if we create a new index.
Regards ,
Raghav

Question:
1.    How do we identify the index to be used.
Generally the index is automatically selected by SAP (DB Optimizer ) ( You can still mention the index name in your select query by changing the syntax)
For your select Query the second Index will be called automatically by the Optimizer, ( Because the select query has u2018Updatu2019 , u2018uptimu2019 in the sequence before the u2018statusu2019 ) .
2.    On which fields should the indexing be done to improve the performance (if available indexes donu2019t cater to our case).
(Create a new Index with MANDT and the 4 fields which are in the where clause in sequence )
3.    What will be the impact on the table performance if we create a new index.
( Since the index which will be newly created is only the 4th index for the table, there shouldnu2019t be any side affects)
After creation of index , Check the change in performance of the current program and also some other programs which are having the select queries on EDIDC ( Various types of where clauses preferably ) to verify that the newly created index is not having the negative impact on the performance. Additionally, if possible , check if you can avoid into corresponding fields .
Regards ,
Seth

Different transaction codes useful for Performance Monitoring

Hi Experts,
Please can you guide me on this question, as to what are the different transaction codes useful for Performance Monitoring i.e. workload statistics and database statistics? What kind of statistics do each of these codes provide?
Many thanks,
Mithun

Hi Mithun
In performance issuses you need to look in terms of many ways that is..
Workload analsys
ST03N: Statistics Regards Locallly
ST03G: Statistics Regards Golbally
STAD: Individual Statistics Regards
STATTRAACE: Individual Statistics Regards Trace
ST07 : User Distribution
Buffers and Memory
ST02 : Buffers and Memory and swaps monitoring
ST10: Table Acess
OS Monitoring
OS04: Locally monitoring
OS07: Remotely monitoring
OS01: LAN check
DataBase Side
ST04: Performance overview
DB01: Exclusive locks
DB02: Tables/Indexes
BackgroundJobs monitor
SM37
other tcodes
ST22: Abap Dumps
SM12: Lock Entries
SM56: NumberRange Buffers
SU56: User Buffer
all above transactions are need to monitor for Performance.
Regards
Bandla

Performance - composite index with 'OR' in 'WHERE' clause

I have a problem with the performance of the following query:
select /*+ index_asc(omschact oma_index1) */ knr, projnr, actnr from omschact where ((knr = 100 and actnr > 30) or knr > 100)
and rownum = 1;
(rownum used only for test purpose)
index:
create index on omschact (knr, projnr);
Execution plan:
Id Operation
0 SELECT STATEMENT
1 COUNT STOPKEY
2 TABLE ACCESS BY INDEX ROWID
3 INDEX FULL SCAN
If I'm correct, the 'OR' in the 'WHERE' clause is responsible for the INDEX FULL SCAN, what makes the query slow.
A solution would be then to separate the 'WHERE' clause in 2 separate select's (1 with 'knr = 100 and actnr > 30' and 1 with 'knr > 100' and combine the results with a UNION ALL.
Since it's necessary to have all rows in ascending order (oma_index1) I still have to use an ORDER BY to make sure the order of the rows is correct. This results again in a (too) low performance.
Another solution that does the trick is to create an index with the 2 fields (knr, projnr) concatenated and to use the same in the 'WHERE' clause:
create index oma_index2 on omschact (knr || projnr);
select /*+ index_asc(omschact oma_index2) */ knr, projnr, actnr from omschact where (knr || projnr) > 10030;
I just can't believe this work-around is the only solution, so I was hoping that someone here knows of a better way to solve this.

padders,
I'll give the real data instead of the example. The index I really use consists of 4 fields. In this table the fields are just numbers, but in other tables I need to use char-fields in indexes, so that's why I concatenate instead of using formula's (allthough I would prefer the latter).
SQL> desc omschact
Name Null? Type
KNR NOT NULL NUMBER(8)
PROJNR NOT NULL NUMBER(8)
ACTNR NOT NULL NUMBER(8)
REGELNR NOT NULL NUMBER(3)
REGEL CHAR(60)
first methode:
SQL> create index oma_key_001(knr,projnr,actnr,regelnr);
Index created.
SQL> select /*+ index_asc(omschact oma_key_001) */ * from omschact where
2 (knr > 100 or
3 (knr = 100 and projnr > 30) or
4 (knr = 100 and projnr = 30 and actnr > 100000) or
5 (knr = 100 and projnr = 30 and actnr = 100000 and regelnr >= 0));
Execution Plan
Plan hash value: 1117430516
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 11M| 822M| 192K (1)| 00:38:26 |
| 1 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 11M| 822M| 192K (1)| 00:38:26 |
|* 2 | INDEX FULL SCAN | OMA_KEY_001 | 11M| | 34030 (1)| 00:06:49 |
Predicate Information (identified by operation id):
2 - filter("KNR">100 OR "KNR"=100 AND "PROJNR">30 OR "KNR"=100 AND "PROJNR"=30
AND "ACTNR">100000 OR "ACTNR"=100000 AND "KNR"=100 AND "PROJNR"=30 AND
"REGELNR">=0)
second method (same index):
SQL> select * from (
2 select /*+ index_asc(omschact oma_key_001) */ * from omschact where knr > 100
3 union all
4 select /*+ index_asc(omschact oma_key_001) */ * from omschact where knr = 100 and projnr > 30
5 union all
6 select /*+ index_asc(omschact oma_key_001) */ * from omschact where knr = 100 and projnr = 30 and actnr > 100000
7 union all
8 select /*+ index_asc(omschact oma_key_001) */ * from omschact where knr = 100 and projnr = 30 and actnr = 100000 and regelnr > 0)
9 order by knr, projnr, actnr, regelnr;
Execution Plan
Plan hash value: 292918786
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 11M| 1203M| | 477K (1)| 01:35:31 |
| 1 | SORT ORDER BY | | 11M| 1203M| 2745M| 477K (1)| 01:35:31 |
| 2 | VIEW | | 11M| 1203M| | 192K (1)| 00:38:29 |
| 3 | UNION-ALL | | | | | | |
| 4 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 11M| 822M| | 192K (1)| 00:38:26 |
|* 5 | INDEX RANGE SCAN | OMA_KEY_001 | 11M| | | 33966 (1)| 00:06:48 |
| 6 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 16705 | 1272K| | 294 (1)| 00:00:04 |
|* 7 | INDEX RANGE SCAN | OMA_KEY_001 | 16705 | | | 54 (0)| 00:00:01 |
| 8 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 47 | 3666 | | 4 (0)| 00:00:01 |
|* 9 | INDEX RANGE SCAN | OMA_KEY_001 | 47 | | | 3 (0)| 00:00:01 |
| 10 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 1 | 78 | | 4 (0)| 00:00:01 |
|* 11 | INDEX RANGE SCAN | OMA_KEY_001 | 1 | | | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
5 - access("KNR">100)
7 - access("KNR"=100 AND "PROJNR">30)
9 - access("KNR"=100 AND "PROJNR"=30 AND "ACTNR">100000)
11 - access("KNR"=100 AND "PROJNR"=30 AND "ACTNR"=100000 AND "REGELNR">0)
third method:
SQL> create index oma_test(to_char(knr,'00000000')||to_char(projnr,'00000000')||to_char(actnr,'00000000')||to_char(regelnr,'000'));
Index created.
SQL> select /*+ index_asc(omschact oma_test) */ * from omschact where
2 (to_char(knr,'00000000')||to_char(projnr,'00000000')||
3 to_char(actnr,'00000000')||to_char(regelnr,'000')) >=
4 (to_char(100,'00000000')||to_char(30,'00000000')||
5* to_char(100000,'00000000')||to_char(0,'000'))
Execution Plan
Plan hash value: 424961364
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 553K| 55M| 1712 (1)| 00:00:21 |
| 1 | TABLE ACCESS BY INDEX ROWID| OMSCHACT | 553K| 55M| 1712 (1)| 00:00:21 |
|* 2 | INDEX RANGE SCAN | OMA_TEST | 99543 | | 605 (1)| 00:00:08 |
Predicate Information (identified by operation id):
2 - access(TO_CHAR("KNR",'00000000')||TO_CHAR("PROJNR",'00000000')||TO_CHAR("
ACTNR",'00000000')||TO_CHAR("REGELNR",'000')>=TO_CHAR(100,'00000000')||TO_CHAR(3
0,'00000000')||TO_CHAR(100000,'00000000')||TO_CHAR(0,'000'))

Using a perform in a form with sapscript

Hi,
I would like to print a field during the runtime in a form. This field it is not available in the program so i would like to find it using a perform in the sapcript.
Someone tell me that this is possible...but someone can tell me how? Is there some docs about this issue?
Best Regards
João Fernandes

Hi,
following is the help link...
http://help.sap.com/saphelp_nw70/helpdata/en/d1/803279454211d189710000e8322d00/frameset.htm
Calling ABAP Subroutines: PERFORM
You can use the PERFORM command to call an ABAP subroutine (form) from any program, subject to the normal ABAP runtime authorization checking. You can use such calls to subroutines for carrying out calculations, for obtaining data from the database that is needed at display or print time, for formatting data, and so on.
PERFORM commands, like all control commands, are executed when a document is formatted for display or printing. Communication between a subroutine that you call and the document is by way of symbols whose values are set in the subroutine.
The system does not execute the PERFORM command within SAPscript replace modules, such as TEXT_SYMBOL_REPLACE or TEXT_INCLUDE_REPLACE. The replace modules can only replace symbol values or resolve include texts, but not interpret SAPscript control commands.
Syntax in a form window:
/: PERFORM <form> IN PROGRAM <prog>
/: USING &INVAR1&
/: USING &INVAR2&
/: CHANGING &OUTVAR1&
/: CHANGING &OUTVAR2&
/: ENDPERFORM
INVAR1 and INVAR2 are variable symbols and may be of any of the four SAPscript symbol types.
OUTVAR1 and OUTVAR2 are local text symbols and must therefore be character strings.
The ABAP subroutine called via the command line stated above must be defined in the ABAP report prog as follows:
FORM <form> TABLES IN_TAB STRUCTURE ITCSY
OUT_TAB STRUCTURE ITCSY.
ENDFORM.
The values of the SAPscript symbols passed with /: USING... are now stored in the internal table IN_TAB . Note that the system passes the values as character string to the subroutine, since the field Feld VALUE in structure ITCSY has the domain TDSYMVALUE (CHAR 80). See the example below on how to access the variables.
The internal table OUT_TAB contains names and values of the CHANGING parameters in the PERFORM statement. These parameters are local text symbols, that is, character fields. See the example below on how to return the variables within the subroutine.
From within a SAPscript form, a subroutine GET_BARCODE in the ABAP program QCJPERFO is called. Then the simple barcode contained there (First page, Next page, Last page) is printed as local variable symbol.
Definition in the SAPscript form:
/: PERFORM GET_BARCODE IN PROGRAM QCJPERFO
/: USING &PAGE&
/: USING &NEXTPAGE&
/: CHANGING &BARCODE&
/: ENDPERFORM
/ &BARCODE&
Coding of the calling ABAP program:
REPORT QCJPERFO.
FORM GET_BARCODE TABLES IN_PAR STUCTURE ITCSY
OUT_PAR STRUCTURE ITCSY.
DATA: PAGNUM LIKE SY-TABIX, "page number
NEXTPAGE LIKE SY-TABIX. "number of next page
READ TABLE IN_PAR WITH KEY PAGE.
CHECK SY-SUBRC = 0.
PAGNUM = IN_PAR-VALUE.
READ TABLE IN_PAR WITH KEY NEXTPAGE.
CHECK SY-SUBRC = 0.
NEXTPAGE = IN_PAR-VALUE.
READ TABLE OUT_PAR WITH KEY BARCODE.
CHECK SY-SUBRC = 0.
IF PAGNUM = 1.
OUT_PAR-VALUE = |. "First page
ELSE.
OUT_PAR-VALUE = ||. "Next page
ENDIF.
IF NEXTPAGE = 0.
OUT_PAR-VALUE+2 = L. "Flag: last page
ENDIF.
MODIFY OUT_PAR INDEX SY-TABIX.
ENDFORM.
Regards,
Bharat.

Flash CS3 - Can't get "snapping to" when using Guides.

I always used guides in Photoshop for years. Ive used them extensively to center graphics and keep multiple graphics balanced and centered. After upgrading to CS3, it seemed that guides stopped working in Photoshop, as well as today in Flash - I was watching a Flash tutorial where the artist snapped a rectangle on it's center by using a guide, when I went to perform the same function - I couldn't get my rectangle to snap to its center on my guide...??
I made sure the setting "snap to" was both on and off........
What am I doing wrong here....???
Thanks so much for time and any help!

Ok, first thing, why are you doing anything with WAMP or XAMPP when you're running a Mac? MAMP should be what you want unless you're not explaining part of what you are trying to do.
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80 is the default port for web serving and the ONLY port that will let you get straight to the server without having to type in webaddress.com:port# instead of just webaddress.com.

Universal worklist using guided procedure

Hi ,
Can any one send me the simple example which will demonstarte the use of universal worklist using guided procedure.
Thanks.

Hi,
Please go through the link below:
https://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/6b66d7ea-0c01-0010-14af-b3ee523210b5&overridelayout=true
The below link gives all the info required for GP.
SAP Composite Application Framework - CAF Tutorial Center
Hope this helps.
Cheers-
Pramod

ESH_ADM_INDEX_ALL_SC cannot perform initial indexing for all search connectors

Dear SAP Gurus,
We are implementing TREX version 7.10.50 for Talent Management ECC 6.0 - EHP 5.
I'd like to ask you question regarding ESH_ADM_INDEX_ALL_SC program
which used to create search connector for TREX and perform initial indexing for all search connectors.
As we know we can perform indexing using ESH_COCKPIT transaction code or use ESH_ADM_INDEX_ALL_SC.
If I try to perform indexing using ESH_COCKPIT, all search connectors can be indexed ("searchable" column are "checked" and status are changed to "Active" for all search connectors).
However, if I try to perform indexing using ESH_ADM_INDEX_ALL_SC, not all search connectors are indexed.
I've traced the program ESH_ADM_INDEX_ALL_SC using ST01 transaction code and found these error:
- rscpe__error 32 at rscpu86r.c(6;742) "dest buffer overflow" (,)
- rscpe__error 32 at rscpc (20;12129) "convert output buffer overflow"
- rscpe__error 128 at rstss01 (1;178) "Object not found"
Please kindly help me to solve this issue,
Thank you very much
Regards,
Bobbi

Hi Luke,
Please find below connectors and the status after running ESH_ADM_INDEX_ALL_SC:
HRTMC AES Documents Prepared
HRTMC AES Elements Prepared
HRTMC AES Templates Prepared
HRTMC Central Person Prepared
HRTMC Functional Area Prepared
HRTMC Job Prepared
HRTMC Job Family Prepared
HRTMC Org Unit Prepared
HRTMC Person Active
HRTMC Position Prepared
HRTMC Qualification Active
HRTMC Relation C JF 450 Active
HRTMC Relation C Q 031 Active
HRTMC Relation CP JF 744 Active
HRTMC Relation CP P 209 Active
HRTMC Relation CP Q 032 Active
HRTMC Relation CP TB 743 Active
HRTMC Relation FN Q 031 Active
HRTMC Relation JF FN 450 Active
HRTMC Relation JF Q 031 Active
HRTMC Relation P Q 032 Active
HRTMC Relation S C 007 Active
HRTMC Relation S CP 740 Active
HRTMC Relation S JF 450 Active
HRTMC Relation S O 003 Active
HRTMC Relation S O Area of Responsibility Active
HRTMC Relation S P 008 Active
HRTMC Relation S Q 031 Active
HRTMC Relation S S Manager Active
HRTMC Relation SC JF FN Active
HRTMC Structural authority Active
HRTMC Talent Group Prepared
As suggested by OSS, we implement SAP Note 1058533.
Kindly need your help.
Thank you very much
Regards
Bobbi

Do I need to perform Process Index on the cube when measure groups has been processed with full individually?

hi there, I am not sure if I need to perform process Index? Do I have to do that after I process full on measure groups?
thanks
--Currently using Reporting Service 2000; Visual Studio .NET 2003; Visual Source Safe SSIS 2008 SSAS 2008, SVN --

I did process update on all dimensions... after that, I did process full on each measure groups...
In this case, do I need to process index on the whole cube?
Hi Cat_ca,
ProcessFull - Simple to digest, applies all objects which means it discards the storage contents of the object and rebuilds them.
ProcessIndexes - Applies to dimension, cube, measure group, and partition.
Since you did process full on each measure groups, I don't think you need do a processindex, here are some links about process options on Analysis Services for your reference.
Different Kinds of SSAS Processing in simple words
Difference between SSAS ProcessUpdate and ProcessFull
Regards,
Charlie Liao
If you have any feedback on our support, please click
here.
Charlie Liao
TechNet Community Support

Measure performance of windows 8 machines using windows Performance Toolkit (WPR tool)

I want to create performance baseline for windows 8 machines(like time to winlogon, time to desktop and total boot time etc.). For this I used windows performance toolkit - WPR tool to record or log performance data(using boot scenario) into log file(.etl). I
opened generated ETL file using WPA(windows performance analyzer), in processes section, always I am able to see winlogon.exe and explorer.exe time more than 2 minutes on different machines. when I did it for windows XP(using xperf) machine
winlogon.exe always showing as less than 30 seconds.
Can you please let me know, how I can get correct data for following tasks using WPR tool:
1) Time to Winlogon(winlogon.exe)
2) Time to Desktop(explorer.exe )
3) Total Boot time
4) Time to Outlook Start
5) Time to Full Outlook Load

Anyone have idea about how to get correct performance data for tasks using windows performance toolkit(WPRUI)?

How to use a Web Template with queries from multiple BW Systems?

Hi all,
can anybody help me how to use a Web Template with queries (DATA PROVIDER)in it from multiple BW Systems?
Thanks in advance, best regards
Frank

Great! Thanks for the quick response.
Have you tried this for XMLA datasources created within the EP system also?
i.e use Web Analyzer to create a view from the XMLA source and use that view within WAD?
Thanks.

Creation of Vendor in MDM using Guided Procedure ...SDA not found

Hi All,
We are trying to create Master data Using Guided Procedure.
After deploying MDM components on Portal we are able to see the standard iViews provided by SAP on Portal.
We are using the following PDF to create the scenario.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/763845b3-0b01-0010-a1a6-c1763df8f049
According the PDF we have to deploy following two sda on the portal server to see the GP callable Object.
H2G_GuidedProcedures.sda
H2G_SourceCode.zip
But we are not able to find Follwoing sda on even Service Market Place.
If anyone knows from wher to download these two SDA, Let us also Know.
Thanks in Advance for Help.
Regards
Shruti.

Shruti,
While clicking on link that is given in PDF for these files its saying:
Error - download expired
Sorry, the file you want to download, is already deleted or the id is incorrect.
Perhaps we require a special ID of basis guys because it might be possible we dont have access to these files.
Just check with your ITICS team.
BR,
Alok

How to use SQL functions in the queries

hey guys i wanna know how to use SQL functions in the queries is it possible or not .

Hi,
Wat exactly that set values are?
those from sql query?
How to use count():
The COUNT() function returns the number of rows that matches a specified criteria.
SQL COUNT(column_name) Syntax
The COUNT(column_name) function returns the number of values (NULL values will not be counted) of the specified column:
SELECT COUNT(column_name) FROM table_name
SQL COUNT(*) Syntax
The COUNT(*) function returns the number of records in a table:
SELECT COUNT(*) FROM table_name
SQL COUNT(DISTINCT column_name) Syntax
The COUNT(DISTINCT column_name) function returns the number of distinct values of the specified column:
SELECT COUNT(DISTINCT column_name) FROM table_name
The IN function helps reduce the need to use multiple OR conditions.
The syntax for the IN function is:
SELECT columns
FROM tables
WHERE column1 in (value1, value2, .... value_n);

Using GUIDs : Performance of Indexes/Queries?

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