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Re: LONG delete with LOTS of FK's

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On 2013-05-09 15:50, Larry Rosenman wrote:
On 2013-05-02 10:08, Tom Lane wrote:
Larry Rosenman <ler@xxxxxxxxxx> writes:
Question: Do all these need to have a bare index just on the account_id
column, or is a multicolumn index with account_id first
sufficient for the check to be reasonably quick?

I would think that such an index would be sufficient, but you could
check for yourself by doing something like

	explain select 1 from <table> where account_id = <something>

and verifying that you get an indexscan not a seqscan, for each
dependent table.

			regards, tom lane
even having done that, and with a SMALL list, we still are getting
VERY LONG deletes:
druckerdb=> select * from pg_stat_activity where procpid=17795;
datid |  datname  | procpid | usesysid | usename | application_name |
client_addr   | client_hostname | client_port |         backend_start
|          xact_start           |          query_start
| waiting |
current_query

-------+-----------+---------+----------+---------+------------------+-----------------+-----------------+-------------+-------------------------------+-------------------------------+-----------------------
--------+---------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-------------------
16407 | druckerdb |   17795 |    16385 | drucker |                  |
192.168.100.230 | blueprint-app1  |       44191 | 2013-05-09
15:07:56.070267-05 | 2013-05-09 15:07:59.111114-05 | 2013-05-09
15:08:20.59
7237-05 | f       | DELETE FROM account WHERE id IN
(248512512,9310573878,588120064,643694592,255393792,512884736,440139776,47448064,324337664,311361536,459276288,5013159782,5009475335,637796352,355794944,48
6866944,692846592)
(1 row)

druckerdb=> \d account
Table "public.account"
Column                 |           Type           |
Modifiers
---------------------------------------+--------------------------+-------------------------------------------------------
id | bigint | not null name | character varying(64) | not null value_table_name | character varying(32) | not null version_item_id | bigint | not null
blob_table_name                       | character varying(32)    | not
null default 'blobs'::character varying
account_type                          | smallint                 | not
null default 1
account_status                        | smallint                 | not
null default 1
editor_licenses                       | integer                  | not
null default 1
expire_date                           | date                     |
appserver                             | text                     | not
null default 'appserver1'::text
appport                               | text                     | not
null default '8080'::text
file_space                            | bigint                   |
security_policy | integer | not null expiry_processed | boolean | default false
contributor_licenses                  | integer                  | not
null default 0
valid_invite_email_domains            | character varying        |
allow_api_calls | boolean | default false allow_chat | boolean | default true
is_template_account                   | boolean                  | not
null default false
billing_type                          | integer                  | not
null default 0
epayment_profile_id | text | not null
instance_value_table_name             | character varying(32)    | not
null default 'instance_values'::character varying
show_public_stream | boolean | not null enable_posting | boolean | default true
cbn_type                              | smallint                 | not
null default 0
account_roles | integer | not null
sap_id                                | text                     |
performance_logging | smallint | default 4
admins_access_glossary_and_all_spaces | boolean                  | not
null default false
signup_country_code                   | text                     |
viewer_licenses                       | integer                  | not
null default 0
glossary_id                           | bigint                   |
terms_of_use_version_accepted         | integer                  |
terms_of_use_accepted_date            | timestamp with time zone |
terms_of_use_admin_id                 | bigint                   |
terms_of_use_accepted_by_id           | bigint                   |
eval_agreement_accepted_date          | timestamp with time zone |
eval_agreement_accepted_by_id         | bigint                   |
previous_load_duration                | bigint                   | not
null default 0
Indexes:
"account_id_key" UNIQUE CONSTRAINT, btree (id) CLUSTER
"account_name_key" UNIQUE CONSTRAINT, btree (name)
"expire_date_idx" btree (expire_date)
Referenced by:
TABLE "account_activity" CONSTRAINT "account_activity_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "account_billing_info" CONSTRAINT
"account_billing_info_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "account_cleaving" CONSTRAINT "account_cleaving_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "account_locked_by" CONSTRAINT
"account_locked_by_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "account_logo" CONSTRAINT "account_logo_account_id_fkey" FOREIGN
KEY (account_id) REFERENCES account(id)
TABLE "account_main_admin" CONSTRAINT
"account_main_admin_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "account_organization" CONSTRAINT
"account_organization_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "preferences" CONSTRAINT "account_preferences_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "account_properties" CONSTRAINT
"account_properties_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "avatars" CONSTRAINT "avatars_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "billing_address" CONSTRAINT "billing_address_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "billing_transaction" CONSTRAINT
"billing_transaction_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "billing_transaction_item" CONSTRAINT
"billing_transaction_item_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "blobs" CONSTRAINT "blobs_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "bnymellon1_values" CONSTRAINT
"bnymellon1_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "capgemini8_values" CONSTRAINT
"capgemini8_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "cityofcalgary_values" CONSTRAINT
"cityofcalgary_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "comments" CONSTRAINT "comments_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "comments_history" CONSTRAINT "comments_history_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "continued_business_need" CONSTRAINT
"continued_business_need_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "css_fro_values" CONSTRAINT "css_fro_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "cvscaremarkadp_values" CONSTRAINT
"cvscaremarkadp_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "epayment_capture_response" CONSTRAINT
"epayment_capture_response_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "ericsson2_values" CONSTRAINT "ericsson2_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "file_attachment" CONSTRAINT
"file_attachment_info_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "frozen_values" CONSTRAINT "frozen_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "future_transaction" CONSTRAINT
"future_transaction_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "ibm_values" CONSTRAINT "ibm_values_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "ibmbpmandrules_values" CONSTRAINT
"ibmbpmandrules_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "ibmbwlteam_values" CONSTRAINT
"ibmbwlteam_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "ibmgbs_values" CONSTRAINT "ibmgbs_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "ibmtechsales_values" CONSTRAINT
"ibmtechsales_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "instance" CONSTRAINT "instance_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "instance_values" CONSTRAINT "instance_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "jmffamilyent_values" CONSTRAINT
"jmffamilyent_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "johnsoncontrols5_values" CONSTRAINT
"johnsoncontrols5_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "keybank3_values" CONSTRAINT "keybank3_values_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "mondialassistancegroup_values" CONSTRAINT
"mondialassistancegroup_values_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "names" CONSTRAINT "names_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "permitted_ips" CONSTRAINT "permitted_ips_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "presby_health_serv_values" CONSTRAINT
"presby_health_serv_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "principal_fin_grp4_values" CONSTRAINT
"principal_fin_grp4_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "item_publications" CONSTRAINT
"process_publications_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "processdoc_tc_nz_values" CONSTRAINT
"processdoc_tc_nz_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "property_descriptions" CONSTRAINT
"property_descriptions_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "saml2_idp_account_junction" CONSTRAINT
"saml2_idp_account_junction_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "task" CONSTRAINT "task_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "template_category" CONSTRAINT
"template_category_template_account_id_fkey" FOREIGN KEY
(template_account_id) REFERENCES account(id)
TABLE "template" CONSTRAINT "template_template_account_id_fkey"
FOREIGN KEY (template_account_id) REFERENCES account(id)
TABLE "text_search_data" CONSTRAINT "text_search_data_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "troweprice2_values" CONSTRAINT
"troweprice2_values_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "usage" CONSTRAINT "usage_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "user_expanded_subs" CONSTRAINT
"user_expanded_subs_account_id_fkey" FOREIGN KEY (account_id)
REFERENCES account(id)
TABLE "user_favorites" CONSTRAINT "user_favorites_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "user_followed" CONSTRAINT "user_favorites_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "user_groups" CONSTRAINT "user_groups_account_id_fkey" FOREIGN
KEY (account_id) REFERENCES account(id)
TABLE "user_permissions" CONSTRAINT "user_permissions_account_id_fkey"
FOREIGN KEY (account_id) REFERENCES account(id)
TABLE "user_prefs" CONSTRAINT "user_prefs_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE "user_viewed" CONSTRAINT "user_viewed_account_id_fkey" FOREIGN
KEY (account_id) REFERENCES account(id)
TABLE "userid" CONSTRAINT "userid_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)
TABLE ""values"" CONSTRAINT "values_account_id_fkey" FOREIGN KEY
(account_id) REFERENCES account(id)

druckerdb=>


Ideas on how to debug?

this is with 9.1.9 on RHEL5 from the PGDG RPM's.
When I did the cancel, the backtrace:
2013-05-09 15:54:32,618 ERROR [pool-1-thread-5] spring.LonSQLExceptionTranslator - Exception executing SQL "DELETE FROM account WHERE id IN (248512512,9310573878,588120064,643694592,255393792,512884736,440139776,47448064,324337664,311361536,459276288,5013159782,5009475335,637796352,355794944,486866944,692846592)" for task "StatementCallback". SQLState is "57014". org.postgresql.util.PSQLException: ERROR: canceling statement due to user request Where: SQL statement "SELECT 1 FROM ONLY "public"."ibmgbs_values" x WHERE $1 OPERATOR(pg_catalog.=) "account_id" FOR SHARE OF x" at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257) at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:374) at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:366) at org.apache.commons.dbcp.DelegatingStatement.execute(DelegatingStatement.java:264) at org.apache.commons.dbcp.DelegatingStatement.execute(DelegatingStatement.java:264) at org.apache.commons.dbcp.DelegatingStatement.execute(DelegatingStatement.java:264) at org.springframework.jdbc.core.JdbcTemplate$1ExecuteStatementCallback.doInStatement(JdbcTemplate.java:368) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:342) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:375) at com.lombardi.online.spring.MonitoringJdbcTemplate.execute(MonitoringJdbcTemplate.java:118) at com.lombardi.online.billing.process.DeleteExpiredAccountsProcess$1.doInTransactionWithoutResult(DeleteExpiredAccountsProcess.java:96) at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33) at com.lombardi.online.repository.db.DeadlockRetryTransactionTemplate$TransactionCallbackWrapper.doInTransaction(DeadlockRetryTransactionTemplate.java:90) at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127) at com.lombardi.online.repository.db.DeadlockRetryTransactionTemplate.execute(DeadlockRetryTransactionTemplate.java:58) at com.lombardi.online.billing.process.DeleteExpiredAccountsProcess.execute(DeleteExpiredAccountsProcess.java:93) at com.lombardi.online.billing.AbstractBillingEngine.deleteExpiredAccounts(AbstractBillingEngine.java:1285) at com.lombardi.online.web.rest.StartRunAccountDeletion$2.run(StartRunAccountDeletion.java:116) at com.lombardi.online.utility.RunnableWithLogging.run(RunnableWithLogging.java:21) at com.lombardi.online.utility.ExecutorPool$2.call(ExecutorPool.java:164)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Is there any way to know what it's doing while it's running?


--
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c)     E-Mail: ler@xxxxxxxxxx
US Mail: 430 Valona Loop, Round Rock, TX 78681-3893


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