提供综合数据库运维服务与优化方案(不限Oracle MySQL PG GaussDB GoldenDB OceanBase等), 微信/Tel:(+86)134-365-60330
数据库oracle
有一个procedure中一段SQL用到了synynom,而synonym指向一个dblink所对应的表，其中是两个子查询做了full join,在procedure 编译时提示ORA-00942: table or view does not exist，而把那段plsql 查询语句块拿出来，做为单条SQL执行时完全正常且有返回结果…
If you are grant privilege to new account like this “grant connect, resource to username”, as you know from 11g the role “Connect” only have “create session” privilege , but now in 12c ,the role “Resource” privilege had changed too.
接上一篇 http://www.anbob.com/archives/2323.html 下面我们从统计信息入手 sys@DEVDB>select count(distinct join_course_count),count(distinct is_course_qual),count(*) from app_zyyjhj.em_examinee; COUNT(DISTINCTJOIN_COURSE_COUNT) COUNT(DISTINCTIS_COURSE_QUAL) COUNT(*) ——————————– —————————– ——————– 6 4 35765 #使用tabstat2 脚本收信表信息，我已截断输出 sys@DEVDB>@tabstat2 em_examinee app_zyyjhj Table Number Empty Average Chain Average Global User Sample Date Name of Rows Blocks Blocks Space Count Row Len Stats Stats Size MM-DD-YYYY ————— ————– ——– ———— ——- ——– ——- —— —— … Read more
当CBO产生的Cardinality过低，尤其是在表之间关连时，往往会差之毫厘差之千里，甚至影响表之间的join方式，注意下MERGE JOIN CARTESIAN部分，这里使用了一种NL style的MJ,..
注意上面的4# 计划 的fileter 部分， 这就是问题的根源。了解SQL的执行步骤应该清楚在sql parse阶段CBO会帮我们做sql查询转换生成高效的执行计划, 在本案例我们想把TO_NUMBER(“S”.”SCORE”)<60 的条件放到子查询返回的结果集后再过滤, 结果CBO错误把此条件提前和该字段的其它条件一并执行..
RMAN Tablespace Point-In-Time Recovery ( TSPITR) enables you to quickly recover one or more tablespaces in an Oracle database to an earlier time, without affecting the state of the rest of the tablespaces and other objects in the database.
DBPITR enables you to recover a database to some time in the past.I will demonstrate below how to do flashback a database to a point in time.
A Question in QQ group get ins-30131 error when install oracle database 12c today, following error
[INS-30131] Initial setup required for the execution of installer validations failed
In the case ,the corrupted block was a index segment
ORA-01578: ORACLE data block corrupted (file # 47, block # 49)
ORA-01110: data file 47: ‘/dev/rdb…’
Rman backup fails with ORA-19566 error
A friend asked me ,they add new disk to a ASM diskgroup. Disks were added successfully. But when tried alter tablespace add new datafile using the diskgroup one the disks were recently added, they got “ora-01119” and “ORA-17502″,”ORA-15041” errors during add new datafile.
昨天DB 磁盘空间预警空间不足，发现临时表空间扩展的非常之大，于是规划调整临时表空间换个磁盘路径，本来online switch temp tablespace 并不难，结果还是遇到小问题..
ON single-instance 1, make sure asm diskgroup is avaliable Select name,total_mb,free_mb from v$asm_diskgroup where state=’CONNECTED’; 2, check current controlfile and using spfile show parameter control_files show parameter pfile 3, add new controlfile to spfile alter system set control_files='[original file]’,'[asm diskgroup name where new control file will stored]’ scope=spfile ; for example: alter system set control_files=’+OLD/ANBOB/controlfile/current.258.798205861′,’+NEW_DATA’ … Read more
自己画了个从oracle 7及后续版本升级到oracle 12c 的升级路线图。 另存为下载查看效果良好。
With the annoucement of Oracle’s database support on RHEL6 and OEL6, they have decided to stop making ASMLIB for RHEL compatible kernels. ASMLIB is now only available if you are using Oracle Unbreakable Linux Kernel.But Recent events enabled Red Hat and Oracle to work togethe. Oracle ASMLib availability and support on Red Hat Enterprise Linux 6.
今天测式部门同事遇到的一个问题记录一下，开发库运行正常，同样的复制到测试库执行应用报错,
LINE/COL ERROR
——– —————————————————————–
59/5 PL/SQL: Statement ignored
59/23 PLS-00382: expression is of wrong type
EXP-00056: ORACLE error 24324 encountered
ORA-24324: service handle not initialized
ORA-07445: exception encountered: core dump [kgghstfel()+15] [SIGSEGV] [Address not mapped to object]
PROMPT List all SQL in the library cache cursor referencing a given table — Author: weejar — — you need to run this script either as SYS or — need to have relevant X$ proxy views created — I tested in oracle 11g it worked . undefine owner undefine table_name prompt accept owner prompt ‘Please … Read more
来模拟一种刚建的表空间，还没来的及备份，数据文件被删除，但archive log 都在时的恢复。 sys@ANBOB>create tablespace tbs_rm datafile ‘/oradata/anbob/tbs_rm01.dbf’ size 10m; Tablespace created. sys@ANBOB>conn anbob Enter password: Connected. anbob@ANBOB>create table test_rm tablespace tbs_rm as select rownum id from dual connect by levelselect * from test_rm; ID ——————– 1 … 9 10 破坏数据文件，使用mv [oracle@db231 ~]$ mv /oradata/anbob/tbs_rm01.dbf /oradata/anbob/tbs_rm01_dbf sys@ANBOB>alter system flush buffer_cache; System altered. anbob@ANBOB>select * from … Read more
Oracle has the BBED utility (block browser and editor) is is all releases of Oracle, from Oracle7 to Oracle10g,In Oracle 11g, BBED becomes unavailable but if you search in the ins_rdbms.mk makefile,…
standby site 的ABMR没有成功， 后来是怀疑buffer header中有mrec 的block, 现在我接着测试如果buffer header 中没有此类block，ABMR是否成功?以前用bbed 标记corrupt block的方式， 如果有corrupt block时rman backup 又会怎么样？