indexing - Can I create an index in mysql without invoking creation of a temporary table the size of my target table? -


mysql 5.05 hosting older application still gets lots of love users. unfortunately, i'm not other hack dba @ best, , hesitant in skills safely migrate new version of database unless absolutely necessary. in process of procuring new application take on responsibilities old application, year out or so.

anyway, patching application other day , added column table, command took while complete , in meantime filled drive hosting datafiles. (table 25g) believe function of creation of temporary table. reasons i'm not clear on, space did not become free again after column added; i.e., lost 25g of disk space. believe (?) due fact database created single datafile; i'm not sure on whys, know had free space elsewhere drive operable state.

that being said, i've got column added, worthless application without index. held off adding index trying figure out if going create massive, persistent 'temporary' table @ index creation time. can out there give me insight into:

  1. will create index , or alter table create index statement result in creation of temporary table same size existing table?

  2. how can recover space got added ibdata1 when added column?

any , advice appreciated.

  1. mysql prior version 5.1 adds/removes indices on innodb tables building temporary tables. it's slow , expensive. way around either upgrade mysql 5.1, or dump table e.g. mysqldump, drop it, recreate new indices, , restore dump.

  2. you can't shrink ibdata1 @ all. solution rebuild scratch. possible configure mysql doesn't use 1 giant ibdata1 file databases - read answer , explain how configure mysql/innodb doesn't happen again, , how safely dump , recreate databases.

ultimately, want to

  • make complete dump of database
  • upgrade mysql 5.1 or newer
  • turn on innodb one-file-per-table mode
  • restore dump.

Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more