Custom Query (2152 matches)

Reported by johnbywater, 4 years ago.

CKAN uses a database. We can put the database on another machine and then clone the CKAN machine. Then there are two machines calling the database and converting SQL results into HTTP responses.

How many machines can you have before the database becomes the bottleneck? At that point, what QoS can be obtained with normal hardware?

Afterwards, can CKAN be made to scale further than this with a little development? Can its Postgres database be mirrored in realtime? Or can we change SQL writes (create/updates) to write to many databases?

Are there any other options for scaling the persistence mechanism?

Reported by johnbywater, 4 years ago.

Update report queries with more recent versions (below are report queries shipped with trac 0.11.7):

NB: Report 1 has already been done.

id | query

1 |

: SELECT p.value AS color, : id AS ticket, summary, component, version, milestone, t.type AS type, : owner, status, : time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status <> 'closed' : ORDER BY CAST(p.value AS integer), milestone, t.type, time :

2 |

: SELECT p.value AS color, : version AS group, : id AS ticket, summary, component, version, t.type AS type, : owner, status, : time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status <> 'closed' : ORDER BY (version IS NULL),version, CAST(p.value AS integer), t.type, time :

3 |

: SELECT p.value AS color,

: 'Milestone '

milestone AS group,

: id AS ticket, summary, component, version, t.type AS type, : owner, status, : time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status <> 'closed' : ORDER BY (milestone IS NULL),milestone, CAST(p.value AS integer), t.type, time :

4 |

: : SELECT p.value AS color, : owner AS group, : id AS ticket, summary, component, milestone, t.type AS type, time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status = 'accepted' : ORDER BY owner, CAST(p.value AS integer), t.type, time :

5 |

: SELECT p.value AS color, : owner AS group, : id AS ticket, summary, component, milestone, t.type AS type, time AS created, : description AS _description_, : changetime AS _changetime, reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status = 'accepted' : ORDER BY owner, CAST(p.value AS integer), t.type, time :

6 |

: SELECT p.value AS color, : t.milestone AS group, : (CASE status : WHEN 'closed' THEN 'color: #777; background: #ddd; border-color: #ccc;' : ELSE : (CASE owner WHEN $USER THEN 'font-weight: bold' END) : END) AS style, : id AS ticket, summary, component, status, : resolution,version, t.type AS type, priority, owner, : changetime AS modified, : time AS _time,reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : ORDER BY (milestone IS NULL), milestone DESC, (status = 'closed'), : (CASE status WHEN 'closed' THEN changetime ELSE (-1) * CAST(p.value AS integer) END) DESC :

7 |

: SELECT p.value AS color, : (CASE status WHEN 'accepted' THEN 'Accepted' ELSE 'Owned' END) AS group, : id AS ticket, summary, component, version, milestone, : t.type AS type, priority, time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE t.status <> 'closed' AND owner = $USER : ORDER BY (status = 'accepted') DESC, CAST(p.value AS integer), milestone, t.type, time :

8 |

: SELECT p.value AS color, : (CASE owner : WHEN $USER THEN 'My Tickets' : ELSE 'Active Tickets' : END) AS group, : id AS ticket, summary, component, version, milestone, t.type AS type, : owner, status, : time AS created, : changetime AS _changetime, description AS _description, : reporter AS _reporter : FROM ticket t : LEFT JOIN enum p ON p.name = t.priority AND p.type = 'priority' : WHERE status <> 'closed' : ORDER BY (COALESCE(owner, ) = $USER) DESC, CAST(p.value AS integer), milestone, t.type, time