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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on May 6, 2020

Create INDEX and SKPT lock. DDL and continuous availability.

Working in a banking 24x7 environment without any maintenance window our concurrency issues with DDL changes are increasing more and more everyday as our workload increases.

There are some concurrency problems that we think it should value the effort to review in order to relieve the situation by modifying the locking strategy DB2 is taking. One of our issues occurs when creating a new INDEX in an application core DB2 TABLE,
we do not reach to understand why a CREATE non UNIQUE INDEX DEFER YES is in need to acquire an exclusive SKPT lock at the beginning of the process over all the packages associated with the DB2 TABLE.

LOCK SKPT COLL=X'E334E4D9D834F640404040404040404040C5'
REQUEST PKID=X'C1D9D834D8C2D3C3'
CTKN=1AF916071722FFE2 DURATION=COMMIT STATE=X
RSN CODE= 0 RTNCD= 0
HASH =X'00003540'

Why does DB2 need this lock? this occurs in a CREATE non UNIQUE INDEX with DEFER YES, the index is new, so it is not in use; for our understanding there should be no need to acquire this lock at all, and by avoiding this lock the index creation process would have ended successfully after a REBUILD SHRLEVEL CHANGE without any online concurrency issues.

Needed by Date Jul 30, 2020
  • Guest
    Jan 25, 2021

    
    Estic fora de la oficina, disculpeu les molèsties.
    Per a qualsevol tema urgent o rel.lacionat amb tècnica de sistemes z/os, si us plau reenvieu el correu a 0901DB2@bancsabadell.com.

    Estaré fuera de la oficina, disculpad las molestias.
    Para cualquier tema urgente o relacionado con técnica de sistemas z/os, por favor reenviar el correo a 0901DB2@bancsabadell.com.

    Sergi Padró.

    ________________________________
    Advertencia legal: Este mensaje y, en su caso, los ficheros anexos son confidenciales, especialmente en lo que respecta a los datos personales, y se dirigen exclusivamente al destinatario referenciado. Si usted no lo es y lo ha recibido por error o tiene conocimiento del mismo por cualquier motivo, le rogamos que nos lo comunique por este medio y proceda a destruirlo o borrarlo, y que en todo caso se abstenga de utilizar, reproducir, alterar, archivar o comunicar a terceros el presente mensaje y ficheros anexos, todo ello bajo pena de incurrir en responsabilidades legales. El emisor no garantiza la integridad, rapidez o seguridad del presente correo, ni se responsabiliza de posibles perjuicios derivados de la captura, incorporaciones de virus o cualesquiera otras manipulaciones efectuadas por terceros.

    ________________________________
    Advertiment legal: Aquest missatge i, si escau, els fitxers annexos tenen caire confidencial, especialment pel que fa a les dades personals, i s'adrecen exclusivament al destinatari referenciat. Si no es tracta d'aquest i l'ha rebut per error o se li ha fet arribar per qualsevol motiu, li preguem que ens ho comuniqui per aquesta mateixa via i el destrueixi o l'esborri, i que en tot cas s'abstingui d'utilitzar, reproduir, alterar, arxivar o comunicar a tercers aquest missatge i fitxers annexos, tot sota pena d'entrar en responsabilitats legals. L'emissor no garanteix la integritat, la rapidesa o la seguretat d'aquest correu, ni es responsabilitza de possibles perjudicis derivats de la captura, incorporacions de virus o qualsevol altres manipulacions que facin tercers.

    ________________________________
    Disclaimer: This message and any attached files transmitted with it, is confidential, especially as regards personal data. It is intended solely for the use of the individual or entity to whom it is addressed. If you are not the intended recipient and have received this information in error or have accessed it for any reason, please notify us of this fact by email reply and then destroy or delete the message, refraining from any reproduction, use, alteration, filing or communication to third parties of this message and attached files on penalty of incurring legal responsibilities. The sender does not guarantee the integrity, the accuracy, the swift delivery or the security of this email transmission, and assumes no responsibility for any possible damage incurred through data capture, virus incorporation or any manipulation carried out by third parties.

    ________________________________

  • Guest
    Dec 7, 2020

    Thanks, Janet.

    Just for my knowledge, ¿what is the reason for this SKPT lock when creating a non UNIQUE INDEX with DEFER YES?

  • Guest
    Dec 7, 2020

    
    Estic fora de la oficina, disculpeu les molèsties.
    Per a qualsevol tema urgent o rel.lacionat amb tècnica de sistemes z/os, si us plau reenvieu el correu a 0901DB2@bancsabadell.com.

    Estaré fuera de la oficina, disculpad las molestias.
    Para cualquier tema urgente o relacionado con técnica de sistemas z/os, por favor reenviar el correo a 0901DB2@bancsabadell.com.

    Sergi Padró.

    ________________________________
    Advertencia legal: Este mensaje y, en su caso, los ficheros anexos son confidenciales, especialmente en lo que respecta a los datos personales, y se dirigen exclusivamente al destinatario referenciado. Si usted no lo es y lo ha recibido por error o tiene conocimiento del mismo por cualquier motivo, le rogamos que nos lo comunique por este medio y proceda a destruirlo o borrarlo, y que en todo caso se abstenga de utilizar, reproducir, alterar, archivar o comunicar a terceros el presente mensaje y ficheros anexos, todo ello bajo pena de incurrir en responsabilidades legales. El emisor no garantiza la integridad, rapidez o seguridad del presente correo, ni se responsabiliza de posibles perjuicios derivados de la captura, incorporaciones de virus o cualesquiera otras manipulaciones efectuadas por terceros.

    ________________________________
    Advertiment legal: Aquest missatge i, si escau, els fitxers annexos tenen caire confidencial, especialment pel que fa a les dades personals, i s'adrecen exclusivament al destinatari referenciat. Si no es tracta d'aquest i l'ha rebut per error o se li ha fet arribar per qualsevol motiu, li preguem que ens ho comuniqui per aquesta mateixa via i el destrueixi o l'esborri, i que en tot cas s'abstingui d'utilitzar, reproduir, alterar, arxivar o comunicar a tercers aquest missatge i fitxers annexos, tot sota pena d'entrar en responsabilitats legals. L'emissor no garanteix la integritat, la rapidesa o la seguretat d'aquest correu, ni es responsabilitza de possibles perjudicis derivats de la captura, incorporacions de virus o qualsevol altres manipulacions que facin tercers.

    ________________________________
    Disclaimer: This message and any attached files transmitted with it, is confidential, especially as regards personal data. It is intended solely for the use of the individual or entity to whom it is addressed. If you are not the intended recipient and have received this information in error or have accessed it for any reason, please notify us of this fact by email reply and then destroy or delete the message, refraining from any reproduction, use, alteration, filing or communication to third parties of this message and attached files on penalty of incurring legal responsibilities. The sender does not guarantee the integrity, the accuracy, the swift delivery or the security of this email transmission, and assumes no responsibility for any possible damage incurred through data capture, virus incorporation or any manipulation carried out by third parties.

    ________________________________

  • Admin
    Janet Figone
    Dec 7, 2020

    Thank you for submitting this Db2 for z/OS Idea.

    After giving the request a comprehensive review, we have determined that we cannot include it as a candidate in an upcoming deliverable because it is not consistent with the product strategy for future deliverables. As a consequence we will not be implementing this Idea.

    We appreciate your input to the Db2 for z/OS development team. We also hope that you will continue to submit ideas for improvements as customer feedback is a key component to shaping the future direction of Db2 for z/OS.

    Sincerely,

    Db2 for z/OS Team