RE: SQL Tuning - How to avoid TOCHAR function against a date
Ron, That's an idea. Easy to implement and test. I'll give it a try tonight to see if it helps. It is a small table. Cherie Ron Rogers RROGERS@galot To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] tery.orgcc: Sent by: Subject: RE: SQL Tuning - How to avoid TOCHAR function against a date [EMAIL PROTECTED] om 04/08/02 03:23 PM Please respond to ORACLE-L Tom, I realize that there would not be an index but I was trying to eliminate some overhead by using the TRUNC function as compaired to the to_char for the fields. Cherie, If the table is not to large how about pinning it to save on disk reads? Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 03:35PM Ron, the TRUNC function will also prevent the use of an index on the oracle_date column. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L Cherie, How about using the TRUNC function on the date field. That will use only thre ,MM,DD of the ORACLE_DATE column. Then you will be comparing like columns without going through the to_char conversion. WHERE TRUNC(ORACLE_DATE) = TRUNC(:b1) Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 01:56PM I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists
RE: SQL Tuning - How to avoid TOCHAR function against a date
I am jumping in the middle of this thread so execuse me if I am repeating the past suggestions I haven't read yet. In a DW you'd have a date dim of dates only (no time component to date) and a time_dim (down to seconds). Your fact table should have a date_key and a time_key if both date and time components are significant. In that case your query SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') would be transformed to: SELECT DATE_KEY FROM DATE_DIM WHERE ORACLE_DATE = TRUNC(:b1); You should perhaps update the oracle_date column in date_dim to TRUNC(oracle_date,'DD') and then rebuild the index on oracle_date column and run the above mentioned query. - Sundeep --- [EMAIL PROTECTED] wrote: Ron, That's an idea. Easy to implement and test. I'll give it a try tonight to see if it helps. It is a small table. Cherie Ron Rogers RROGERS@galot To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] tery.orgcc: Sent by: Subject: RE: SQL Tuning - How to avoid TOCHAR function against a date [EMAIL PROTECTED] om 04/08/02 03:23 PM Please respond to ORACLE-L Tom, I realize that there would not be an index but I was trying to eliminate some overhead by using the TRUNC function as compaired to the to_char for the fields. Cherie, If the table is not to large how about pinning it to save on disk reads? Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 03:35PM Ron, the TRUNC function will also prevent the use of an index on the oracle_date column. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L Cherie, How about using the TRUNC function on the date field. That will use only thre ,MM,DD of the ORACLE_DATE column. Then you will be comparing like columns without going through the to_char conversion. WHERE TRUNC(ORACLE_DATE) = TRUNC(:b1) Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 01:56PM I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9
RE: SQL Tuning - How to avoid TOCHAR function against a date
I have not got a system to test this out on at the moment but can you do a substr on the to_char so that the format matches the date_key Something like substr((TO_CHAR(:b1,'DD-MON-'),11) John -Original Message- [EMAIL PROTECTED] Sent: 08 April 2002 18:57 To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: John Hallas INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
Cherie, Couldn't you do SELECT DATE_KEY FROM DATE_DIM WHERE ORACLE_DATE = trunc(:b1) and oracle_date trunc(:b1) + 1 which should at least give a range scan. Iain Nicoll -Original Message- Sent: Monday, April 08, 2002 6:57 PM To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Nicoll, Iain (Calanais) INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
Could you maybe calculate a range of date values that encompasses the period you want and use BETWEEN on the raw date column? I'm thinking something along the lines of: SELECT DATE_KEY FROM DATE_DIM WHERE ORACLE_DATE BETWEEN TRUNC(:b1) AND TRUNC(:b1) + .9 ; but like, more elegant. 8^) HTH, -Roy Roy Pardee Programmer/Analyst SWFPAC Lockheed Martin IT Extension 8487 -Original Message- Sent: Monday, April 08, 2002 10:57 AM To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Pardee, Roy E INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
John, I will test it out. Thanks for your helpful recommendation. Cherie John Hallas john.hallas@hcresour To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] ces.co.uk cc: Sent by:Subject: RE: SQL Tuning - How to avoid TOCHAR function against a date [EMAIL PROTECTED] 04/08/02 01:20 PM Please respond to ORACLE-L I have not got a system to test this out on at the moment but can you do a substr on the to_char so that the format matches the date_key Something like substr((TO_CHAR(:b1,'DD-MON-'),11) John -Original Message- [EMAIL PROTECTED] Sent: 08 April 2002 18:57 To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: John Hallas INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list
Re: SQL Tuning - How to avoid TOCHAR function against a date
I don't think you can do it.. I mean, you could change it to trunc the oracle_date field (that eliminates the minutes) and then do a to_date of :b1 but you will still be operating on the oracle_date field. Okay, I HATE to suggest this, but since the table is small: add another field to the table oracle_date_2 as a date field. Update the table set oracle_date_2=trunc(oracle_date) add a trigger to fill in oracle_date_2 when you insert a row or update the oracle_date column create an index on oracle_date_2 and change the query to use that column --- [EMAIL PROTECTED] wrote: I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). __ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
Iain, I will do some tests. Theoretically, yes, a range scan should be better than a full table scan. Thanks for your helpful recommendation. Cherie Nicoll, Iain (Calanais)To: '[EMAIL PROTECTED]' [EMAIL PROTECTED] iain.nicoll@cal cc: '[EMAIL PROTECTED]' [EMAIL PROTECTED] anais.com Subject: RE: SQL Tuning - How to avoid TOCHAR function against a date 04/08/02 12:37 PM Cherie, Couldn't you do SELECT DATE_KEY FROM DATE_DIM WHERE ORACLE_DATE = trunc(:b1) and oracle_date trunc(:b1) + 1 which should at least give a range scan. Iain Nicoll -Original Message- Sent: Monday, April 08, 2002 6:57 PM To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
Something like: WHERE ORACLE_DATE between trunc(:b1) and trunc(:b1) + 1 - 1/(24*60*60) -Original Message- Sent: Monday, April 08, 2002 12:57 PM To: Multiple recipients of list ORACLE-L I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Norrell, Brian INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: SQL Tuning - How to avoid TOCHAR function against a date
Cherie, How about using the TRUNC function on the date field. That will use only thre ,MM,DD of the ORACLE_DATE column. Then you will be comparing like columns without going through the to_char conversion. WHERE TRUNC(ORACLE_DATE) = TRUNC(:b1) Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 01:56PM I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
Ron, the TRUNC function will also prevent the use of an index on the oracle_date column. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L Cherie, How about using the TRUNC function on the date field. That will use only thre ,MM,DD of the ORACLE_DATE column. Then you will be comparing like columns without going through the to_char conversion. WHERE TRUNC(ORACLE_DATE) = TRUNC(:b1) Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 01:56PM I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mercadante, Thomas F INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: SQL Tuning - How to avoid TOCHAR function against a date
let's face it Rachel, the date column is probably incorrect as the table was designed. knowing that it is important in queries, and that the minutes cause problems during query, your suggestion should have been incorporated in the original design (or truncing the oracle_date field via a trigger). both the blessing and curse of the DATE column. great for performing date math, but a pain when it comes to queries. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L I don't think you can do it.. I mean, you could change it to trunc the oracle_date field (that eliminates the minutes) and then do a to_date of :b1 but you will still be operating on the oracle_date field. Okay, I HATE to suggest this, but since the table is small: add another field to the table oracle_date_2 as a date field. Update the table set oracle_date_2=trunc(oracle_date) add a trigger to fill in oracle_date_2 when you insert a row or update the oracle_date column create an index on oracle_date_2 and change the query to use that column --- [EMAIL PROTECTED] wrote: I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). __ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mercadante, Thomas F INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists
RE: SQL Tuning - How to avoid TOCHAR function against a date
I suppose if you wanted to collect statistics about hourly usage, then the minutes info would be necessary but then, most people don't think about how they really want to use the date when they add a date field --- Mercadante, Thomas F [EMAIL PROTECTED] wrote: let's face it Rachel, the date column is probably incorrect as the table was designed. knowing that it is important in queries, and that the minutes cause problems during query, your suggestion should have been incorporated in the original design (or truncing the oracle_date field via a trigger). both the blessing and curse of the DATE column. great for performing date math, but a pain when it comes to queries. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L I don't think you can do it.. I mean, you could change it to trunc the oracle_date field (that eliminates the minutes) and then do a to_date of :b1 but you will still be operating on the oracle_date field. Okay, I HATE to suggest this, but since the table is small: add another field to the table oracle_date_2 as a date field. Update the table set oracle_date_2=trunc(oracle_date) add a trigger to fill in oracle_date_2 when you insert a row or update the oracle_date column create an index on oracle_date_2 and change the query to use that column --- [EMAIL PROTECTED] wrote: I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). __ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be
RE: SQL Tuning - How to avoid TOCHAR function against a date
Tom, I realize that there would not be an index but I was trying to eliminate some overhead by using the TRUNC function as compaired to the to_char for the fields. Cherie, If the table is not to large how about pinning it to save on disk reads? Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 03:35PM Ron, the TRUNC function will also prevent the use of an index on the oracle_date column. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L Cherie, How about using the TRUNC function on the date field. That will use only thre ,MM,DD of the ORACLE_DATE column. Then you will be comparing like columns without going through the to_char conversion. WHERE TRUNC(ORACLE_DATE) = TRUNC(:b1) Ron ROR mª¿ªm [EMAIL PROTECTED] 04/08/02 01:56PM I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND NOT NULL CHAR(1) DATA_WAREHOUSE_MOD_DATETIME NOT NULL DATE DATA_MART_MOD_DATETIME NOT NULL DATE SQL select oracle_date from date_dim where rownum=1; ORACLE_DA - 01-JAN-70 Thanks in advance for any help. Cherie Machler Oracle DBA Gelco Information Network -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Ma il message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mercadante, Thomas F INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego,
RE: SQL Tuning - How to avoid TOCHAR function against a date
Tom, It is probably too late for this original design but it is not too late for a new data warehouse that is in development. Jared has made a recommendation for better date columns that may help eliminate these problems. I have forwarded that table design on to the application owner. Thanks for your reply. Cherie Mercadante, Thomas F To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] [EMAIL PROTECTED] cc: ate.ny.us Subject: RE: SQL Tuning - How to avoid TOCHAR function against a date Sent by: [EMAIL PROTECTED] 04/08/02 02:35 PM Please respond to ORACLE-L let's face it Rachel, the date column is probably incorrect as the table was designed. knowing that it is important in queries, and that the minutes cause problems during query, your suggestion should have been incorporated in the original design (or truncing the oracle_date field via a trigger). both the blessing and curse of the DATE column. great for performing date math, but a pain when it comes to queries. Tom Mercadante Oracle Certified Professional -Original Message- Sent: Monday, April 08, 2002 2:54 PM To: Multiple recipients of list ORACLE-L I don't think you can do it.. I mean, you could change it to trunc the oracle_date field (that eliminates the minutes) and then do a to_date of :b1 but you will still be operating on the oracle_date field. Okay, I HATE to suggest this, but since the table is small: add another field to the table oracle_date_2 as a date field. Update the table set oracle_date_2=trunc(oracle_date) add a trigger to fill in oracle_date_2 when you insert a row or update the oracle_date column create an index on oracle_date_2 and change the query to use that column --- [EMAIL PROTECTED] wrote: I've got the following SQL statement that is running very long on a nightly data load. The problem is the TO_CHAR function which is preventing me from using the index on this small (20,000-row table). This is an 8.0.4 database so it is not possible for me to use make this a function-based index. The problem is that the date field has minutes, etc. included and those need to be eliminated before the comparison can be made. That's why I can't just eliminate the TO_CHAR from both sides of the equation. Isn't there a way that I can pull this function out of the select statement and do it in a preceeding statement? Then I could just pass in both variables to this statement without the TO_CHAR and use my index. Is this realistic? How, exactly could it be done? SELECT DATE_KEY FROM DATE_DIM WHERE TO_CHAR(ORACLE_DATE,'DD-MON-') = TO_CHAR(:b1,'DD-MON-') SQL desc date_dim; NameNull?Type --- DATE_KEYNOT NULL NUMBER(5) ORACLE_DATE NOT NULL DATE DATACOM_DATE NUMBER(6) DATACOM_REVERSE_DATE NUMBER(6) DAY_OF_WEEK NOT NULL VARCHAR2(30) DAY_NUMBER_IN_MONTH NOT NULL NUMBER(3) DAY_NUMBER_OVERALL NOT NULL NUMBER(9) WEEK_NUMBER_IN_YEAR NOT NULL NUMBER(3) WEEK_NUMBER_OVERALL NOT NULL NUMBER(7) MONTH NOT NULL VARCHAR2(30) MONTH_NUMBER_OVERALLNOT NULL NUMBER(7) YEARNOT NULL NUMBER(5) WEEKDAY_IND NOT NULL CHAR(1) LAST_DAY_IN_MONTH_IND
