Optimize MySQL update statement












0















I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.



UPDATE PCL 
SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
WHERE `BS` = 'B' AND `T1A` IS NOT NULL;


Is there a way I can rewrite the above query so that it runs faster?



This is the structure of the PCL table



SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) | 
Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |


This is the HST table



SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) | 
OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |








share







New contributor




Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

























    0















    I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.



    UPDATE PCL 
    SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
    HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
    WHERE `BS` = 'B' AND `T1A` IS NOT NULL;


    Is there a way I can rewrite the above query so that it runs faster?



    This is the structure of the PCL table



    SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) | 
    Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
    F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
    CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
    T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
    P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
    DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
    T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
    S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |


    This is the HST table



    SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) | 
    OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |








    share







    New contributor




    Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      0












      0








      0








      I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.



      UPDATE PCL 
      SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
      HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
      WHERE `BS` = 'B' AND `T1A` IS NOT NULL;


      Is there a way I can rewrite the above query so that it runs faster?



      This is the structure of the PCL table



      SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) | 
      Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
      F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
      CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
      T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
      P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
      DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
      T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
      S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |


      This is the HST table



      SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) | 
      OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |








      share







      New contributor




      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I have an update query that selects data from a table (HST) and updates it into another table (PCL). The PCL table contains ~30000 rows while the HST table contains about 1.5 million rows. I have multiple (composite) indexes on HST and despite being a large table all queries on it are fairly quick (~2-3 sec). However, when I attempt to select rows from this table and update PCL, it takes 3-4 hours, and in most cases I get "Lock wait timeout exceeded; try restarting transaction" errors and I have to keep trying until it works.



      UPDATE PCL 
      SET `T2A` = (SELECT HST.`Date` from `HST` WHERE HST.`SYM`=PCL.INST AND
      HST.`DATE` >= PCL.Date AND HST.`HP` >= PCL.T2 order by HST.`Date` limit 1)
      WHERE `BS` = 'B' AND `T1A` IS NOT NULL;


      Is there a way I can rewrite the above query so that it runs faster?



      This is the structure of the PCL table



      SrNo, int(6) | Created, datetime | Time, datetime | CNo, varchar(6) | 
      Date, date | A1, varchar(4) | A2, varchar(4) | A3, varchar(4) |
      F1, varchar(6) | INST, varchar(20) | BS, char(1) | CAB, char(2) |
      CM, float(8,2) | CMSQL, float(8,2) | T1, float(8,2) | T2, float(8,2) |
      T3, float(8,2) | SL, float(8,2) | FSL, float(8,2) | P1, int(4) |
      P2, int(4) | TT, char(1) | P1C, date | P2C, date | DateP1, date |
      DateP2, date | P1C, date | P2C, date | T1A, date | T2A, date |
      T3A, date | SLH, date | TT, float | TSt, char(3) | TA, float |
      S10K, float | CV, float | R%, float | C1, char(1) | L1, varchar(6) |


      This is the HST table



      SrNo, int(11) | SYM, varchar(20) | Date, date | PC, float(8,2) | 
      OP, float(8,2) | HP, float(8,2) | LP, float(8,2) | CP, float(8,2) |






      mysql optimization mysql-5.6 update





      share







      New contributor




      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      share







      New contributor




      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.








      share



      share






      New contributor




      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 9 mins ago









      QuarkQuark

      1




      1




      New contributor




      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          0






          active

          oldest

          votes











          Your Answer








          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "182"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });






          Quark is a new contributor. Be nice, and check out our Code of Conduct.










          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f230458%2foptimize-mysql-update-statement%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          Quark is a new contributor. Be nice, and check out our Code of Conduct.










          draft saved

          draft discarded


















          Quark is a new contributor. Be nice, and check out our Code of Conduct.













          Quark is a new contributor. Be nice, and check out our Code of Conduct.












          Quark is a new contributor. Be nice, and check out our Code of Conduct.
















          Thanks for contributing an answer to Database Administrators Stack Exchange!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f230458%2foptimize-mysql-update-statement%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Liste der Baudenkmale in Friedland (Mecklenburg)

          Single-Malt-Whisky

          Czorneboh