database-administration

问题 I downloaded a VM image of a web application that uses MySQL. How can I monitor its space consumption and know when additional space must be added? 回答1: I have some great big queries to share: Run this to get the Total MySQL Data and Index Usage By Storage Engine SELECT IFNULL(B.engine,'Total') "Storage Engine", CONCAT(LPAD(REPLACE(FORMAT(B.DSize/POWER(1024,pw),3),',',''),17,' '),' ', SUBSTR(' KMGTP',pw+1,1),'B') "Data Size", CONCAT(LPAD(REPLACE( FORMAT(B.ISize/POWER(1024,pw),3),',',''),17,'

问题 In PostgreSQL 9+, is there a way to GRANT ALL PRIVILEGES on ALL VIEWS in schema schema_name TO role_name in a single statement? 回答1: The only way to do this in a single statement (kind of) is to create a function, otherwise you are either specifically listing all views or you are granting to all tables, then revoking non-views. I wrote this quickly, but tested it. You may need to tweak as needed: CREATE OR REPLACE FUNCTION fn_grant_all_views(schema_name TEXT, role_name TEXT) RETURNS VOID AS

问题 Creating a new database (basic and advanced), It's my first time dealing with Oracle, in which I do not know why so many tables, triggers, views and other objects when only wanted to create a relational data base empty. Is there another way to do this or is there something I missed understand? Thank you. Capture: 回答1: Those objects are owned by SYS user. You could verify it using following query: SELECT * FROM DBA_OBJECTS WHERE OWNER = 'SYS'; To see the objects owned by other users, see:

问题 I changed to "ft_min_word_len" = 4 by my-innodb-heavy-4G.ini located in my system path "C:\Program Files\MySQL\MySQL Server 5.1" , but when i run SHOW VARIABLES LIKE 'ft_min_word_len' I got still result value= 4 . I did not find this variable in my.ini file. So i have also create a my logic. I copied to ft_min_word_len variable and place in my.ini file and now my result show value=3 . But it is not working for three character search. I've restarted server. How can i achieve to be able to

问题 I hope the title is somewhat helpful. I'm using MySQL as my database I am building a database of products and am not sure how to handle storing prices/SKU of variations of a product. A product may have unlimited variations, and each variation combination has its own price/SKU/etc.. This is how I have my products/variations table set up at the moment: PRODUCTS +--------------------------+ | id | name | description | +----+------+--------------+ | 1 | rug | a cool rug | | 2 | cup | a coffee cup

问题 An update SQL query was executed on the server, which caused many problems later. How can I get the list of update queries executed in last 2 months, so that I can trace the exact problematic SQL query? 回答1: select v.SQL_TEXT, v.PARSING_SCHEMA_NAME, v.FIRST_LOAD_TIME, v.DISK_READS, v.ROWS_PROCESSED, v.ELAPSED_TIME, v.service from v$sql v where to_date(v.FIRST_LOAD_TIME,'YYYY-MM-DD hh24:mi:ss')>ADD_MONTHS(trunc(sysdate,'MM'),-2) where clause is optional. You can sort the results according to

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . How to use H2 database's integrated managment frontend? For operations such as create table, alter table, add column, and so on. 回答1: I like SQuirreL SQL Client, and NetBeans is very useful; but more often, I just fire up the built-in org.h2.tools.Server and browse port 8082: $ java -cp /opt/h2/bin/h2.jar org.h2

问题 This looks like a very basic need, but I do not find any quick and suitable answer. I have a role in Postgres which has privileges to many other tables in various databases. I need to drop this role. I have one postgres instance and then many databases on top of it. SELECT DISTINCT 'REVOKE ALL ON TABLE ' || table_schema || '.' || table_name || ' FROM ' || r.param_role_name || ';' FROM information_schema.table_privileges CROSS JOIN (SELECT 'some_role_name'::text AS param_role_name) r WHERE

问题 I am struggling to comprehend how default schema privileges work in Postgres. To me, they are something that supposed to ease administration load by issuing permissions automatically, but I found them bit unusable. I discovered several things that are not at all obvious from documentation. I want several users to be able to create and modify objects in schema. I create a role who gonna be the owner and grant this role to multiple (in general) users: create schema my_schema; create role my

问题 in MySQL, is it good to have 500 Columns in one table? the rows will be increasing daily, the maximum row count would be less than or equal to 1million. just to give a brief, these are my column headers TableName: process_detail id, process_id, item_id, item_category, attribute1,attribute2,attribute3,...,attribute500,user_id1_update_time,user_id2_update_time,user_id1_comments,user_id2_comments all attributes are varchar with length maximum 30. but less than 30. and i have 25 item_categories.