求助,还能这么优化?这是一个视图的查询,每次要10秒左右。 我移到存储过程中,居然报ORA-01747:user.table.column,table.column或列说明无效 无语了,放在视图中没问题的, dblink是不是有什么限制,还是啥的。 Oracle insert into MR_MSG_XZBKMX_RES_BKXX(
求助,还能这么优化?这是一个视图的查询,每次要10秒左右。我移到存储过程中,居然报 ORA-01747: user.table.column, table.column 或列说明无效
无语了,放在视图中没问题的,
dblink是不是有什么限制,还是啥的。 Oracle
insert into MR_MSG_XZBKMX_RES_BKXX(ID,MSGID,HH,HM, DZ,BW,BCH, BWH,KJ,BSH, SQXZ,SQCBR,HBSL, ZDDS,RJSL,LSSL, QSL1,QSL2,QSL3, DJ,HHYS,YSXZMS, RKS,CBZQ,SFLX, LXDH,ZBRQ,QFSL, QFJE,QFBS,DKZHYE, SQDBDS,YSKYE,TSXX, MS1,MS2,MS3, MS4,MS5,CBSXH, BKSXH) select SEQ_MR_MSG_XZBKMX_RES_BKXX.nextval, pinmsgid,x.HH,x.HM, x.DZ,x.BW,x.BCH, x.BWH,x.KJ,x.BSH, x.SQXZ,x.SQCBR,x.HBSL, decode(x.ZDDS,0,v_zdds,x.ZDDS),x.RJSL,case when v_lssllx=1 then x.qsl1 else x.pjsl end, x.QSL1,x.QSL2,x.QSL3, x.DJ,x.HHYS,x.YSXZMS, x.RKS,x.CBZQ,x.SFLX, x.LXDH,x.ZBRQ,x.QFSL, x.QFJE,x.QFBS,x.DKZHYE, x.SQDBDS,x.YSKYE,x.TSXX, x.MS1,x.MS2,x.MS3, x.MS4,x.MS5,x.CBSXH, rownum from (select a.hh, a.bzmc HM, a.yhdz DZ, a.zbwz BW, a.bch, a.bwh, f.kj, f.bsh, NVL(g.xbqd,d.sqxz) SQXZ, d.sqcbr, 0 hbsl, f.zdds zdds, -1 rjsl, d.pjsl, d.qsl1,d.qsl2,d.qsl3, a.zysxz, h.dj, case when a.ysxzsl=1 then 0 else 1 end hhys, h.xzms YSXZMS, a.ysrk RKS, a.cbzq, i.sflx, i.lxdh, k.zbrq, 0 QFSL, 0 QFJE, 0 QFBS, 0 dkzhye, 0 sqdbds, NVL(i.yskye,0) yskye, null tsxx, null ms1, null ms2, null ms3, null ms4, null ms5, d.cbsxh from da_yhbk@o3mislink a full join da_cbxx@o3mislink d on a.hh = d.hh full join sb_sbda@o3mislink f on f.sbid = a.sbid full join da_khxx@o3mislink i on i.khh = a.khh full join da_lhxx@o3mislink k on k.hh = a.hh full join da_dm_yhzt@o3mislink c on a.yhzt = c.ztid and c.sfcb = 1 left join mr_gps n on a.hh=n.hh left join (select x.hh,x.xbqd from cb_chrw@o3mislink x, (select a.hh,max(a.sgrq) sgrq from cb_chrw@o3mislink a,da_yhbk@o3mislink c where (v_bchs like '%'||c.bch||',%') and a.hh=c.hh and a.jsbz=1 group by a.hh) y where x.hh = y.hh and x.sgrq = y.sgrq) g on g.hh = a.hh full join (select ysxz,dj,xzms from fy_ysxz@o3mislink where v_sfyf between sxrq and nvl(jsrq,v_sfyf) ) h on a.zysxz = h.ysxz left join cb_slb@o3mislink e on a.hh = e.hh and e.jgbz in (0,1,2,4,6,7) and e.sfyf = v_sfyf where v_bchs like '%'||a.bch||',%' and MOD(EXTRACT(month from trunc(v_sfyf,'MM')),a.CBZQ)=MOD(a.QCY,a.CBZQ) and e.hh is null order by a.bch,d.cbsxh ) x;
SELECT STATEMENT, GOAL = ALL_ROWS 216384 148833 69058512 SORT ORDER BY 216384 148833 69058512 FILTER NESTED LOOPS OUTER 201685 148833 69058512 HASH JOIN RIGHT SEMI 168940 148833 68165514 TABLE ACCESS FULL NNMIS DA_DM_YHZT 2 5 30 VIEW SYS 168919 1041831 470907612 UNION-ALL HASH JOIN RIGHT OUTER 123752 1041825 468821250 TABLE ACCESS BY INDEX ROWID NNMIS FY_YSXZ 3 6 186 INDEX RANGE SCAN NNMIS IDX_FY_YSXZ_SXRQ 2 21 HASH JOIN RIGHT OUTER 123731 1041825 436524675 VIEW NNMIS 1052 1 26 TABLE ACCESS BY INDEX ROWID NNMIS CB_CHRW 2 1 14 NESTED LOOPS 1052 1 36 VIEW NNMIS 1050 1 22 HASH GROUP BY 1050 1 33 HASH JOIN 1047 17643 582219 INDEX FAST FULL SCAN NNMIS IX_DA_YHBK_BCH 431 17341 329479 TABLE ACCESS FULL NNMIS CB_CHRW 614 33941 475174 INDEX RANGE SCAN NNMIS IDX_CB_CHRW_HH 1 1 HASH JOIN RIGHT OUTER 122661 1041825 409437225 REMOTE MR_GPS 0 1 9 VIEW SYS 122642 1041825 400060800 UNION-ALL HASH JOIN RIGHT OUTER 49369 710090 274804830 TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 3980832 VIEW SYS 35071 710090 266283750 UNION-ALL HASH JOIN RIGHT OUTER 16953 374282 127255880 TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 5372944 VIEW SYS 8900 374282 121267368 UNION-ALL NESTED LOOPS OUTER 4073 174 54462 VIEW SYS 3724 174 52026 UNION-ALL NESTED LOOPS OUTER 2685 173 41174 TABLE ACCESS FULL NNMIS DA_YHBK 2346 173 36676 TABLE ACCESS BY INDEX ROWID NNMIS DA_CBXX 2 1 26 INDEX UNIQUE SCAN NNMIS PK_DA_CBXX 1 1 FILTER NESTED LOOPS ANTI 1040 1 39 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 8625136 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS BY INDEX ROWID NNMIS SB_SBDA 2 1 14 INDEX UNIQUE SCAN NNMIS PK_CB_SBDA 1 1 FILTER HASH JOIN RIGHT ANTI 4827 374108 10100916 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 5237526 FILTER HASH JOIN ANTI 18117 335808 9738432 TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 5372944 VIEW NNMIS 15153 720937 9372181 UNION-ALL HASH JOIN RIGHT OUTER 11205 346829 10404870 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 10094 346829 9017554 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN ANTI 3948 374108 6359836 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 FILTER HASH JOIN ANTI 73273 331735 8293375 TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 3980832 VIEW NNMIS 70721 1056745 13737685 UNION-ALL HASH JOIN RIGHT OUTER 54237 720937 22349047 INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045 VIEW NNMIS 52462 720937 18744362 UNION-ALL HASH JOIN RIGHT OUTER 46713 346829 743948205 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 VIEW NNMIS 10094 346829 721057491 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN RIGHT ANTI 5749 374108 29554532 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 HASH JOIN ANTI 16484 335808 6044544 INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045 VIEW NNMIS 15153 720937 9372181 UNION-ALL HASH JOIN RIGHT OUTER 11205 346829 10404870 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 10094 346829 9017554 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN ANTI 3948 374108 6359836 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 FILTER FILTER TABLE ACCESS BY INDEX ROWID NNMIS FY_YSXZ 3 6 186 INDEX RANGE SCAN NNMIS IDX_FY_YSXZ_SXRQ 2 21 HASH JOIN RIGHT OUTER 16080 3472 187488 VIEW NNMIS 1052 1 13 TABLE ACCESS BY INDEX ROWID NNMIS CB_CHRW 2 1 14 NESTED LOOPS 1052 1 36 VIEW NNMIS 1050 1 22 SORT GROUP BY 1050 1 33 HASH JOIN 1047 17643 582219 INDEX FAST FULL SCAN NNMIS IX_DA_YHBK_BCH 431 17341 329479 TABLE ACCESS FULL NNMIS CB_CHRW 614 33941 475174 INDEX RANGE SCAN NNMIS IDX_CB_CHRW_HH 1 1 NESTED LOOPS OUTER 15029 3472 142352 VIEW NNMIS 15027 3472 111104 UNION-ALL HASH JOIN OUTER 15027 3471 10805223 VIEW NNMIS 12159 3471 10520601 UNION-ALL HASH JOIN OUTER 12159 3470 8904020 VIEW NNMIS 7509 3470 8376580 UNION-ALL HASH JOIN OUTER 7509 3469 7441005 VIEW NNMIS 4886 3469 7212051 UNION-ALL HASH JOIN OUTER 4886 3468 6211188 TABLE ACCESS FULL NNMIS DA_YHBK 2137 3468 5916408 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 FILTER NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 FILTER HASH JOIN RIGHT ANTI 5749 374108 29554532 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 51042968 FILTER HASH JOIN RIGHT ANTI 20276 335808 55408320 VIEW NNMIS 15153 720937 9372181 UNION-ALL HASH JOIN RIGHT OUTER 11205 346829 10404870 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 10094 346829 9017554 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN ANTI 3948 374108 6359836 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS DA_KHXX 1631 335809 51042968 TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 27202352 FILTER HASH JOIN RIGHT ANTI 74367 331735 31514825 VIEW NNMIS 70721 1056745 13737685 UNION-ALL HASH JOIN RIGHT OUTER 54237 720937 22349047 INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045 VIEW NNMIS 52462 720937 18744362 UNION-ALL HASH JOIN RIGHT OUTER 46713 346829 743948205 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 VIEW NNMIS 10094 346829 721057491 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN RIGHT ANTI 5749 374108 29554532 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS SB_SBDA 883 374109 24691194 HASH JOIN ANTI 16484 335808 6044544 INDEX FAST FULL SCAN NNMIS SYS_C0057272 173 335809 1679045 VIEW NNMIS 15153 720937 9372181 UNION-ALL HASH JOIN RIGHT OUTER 11205 346829 10404870 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 10094 346829 9017554 UNION-ALL MERGE JOIN OUTER 9055 346828 621168948 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 591688568 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 7509 331736 28197560 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 NESTED LOOPS ANTI 1040 1 98 TABLE ACCESS FULL NNMIS DA_CBXX 931 331736 28197560 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 HASH JOIN ANTI 3948 374108 6359836 INDEX FAST FULL SCAN NNMIS PK_CB_SBDA 181 374109 1496436 VIEW NNMIS 3050 346829 4508777 UNION-ALL MERGE JOIN OUTER 2771 346828 10751668 TABLE ACCESS BY INDEX ROWID NNMIS DA_YHBK 1546 346828 9017528 INDEX FULL SCAN NNMIS PK_DA_YHBK 744 346828 SORT JOIN 1226 331736 1658680 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 NESTED LOOPS ANTI 279 1 18 INDEX FAST FULL SCAN NNMIS PK_DA_CBXX 171 331736 1658680 INDEX UNIQUE SCAN NNMIS PK_DA_YHBK 0 346828 4508764 TABLE ACCESS FULL NNMIS DA_LHXX 879 331736 27202352 REMOTE MR_GPS 0 1 9 VIEW SYS 0 1 6 TABLE ACCESS BY INDEX ROWID NNMIS CB_SLB 4 1 17 INDEX RANGE SCAN NNMIS IX_CB_SLB_HH_SFYF 3 1

Stored procedures are precompiled SQL statements in MySQL for improving performance and simplifying complex operations. 1. Improve performance: After the first compilation, subsequent calls do not need to be recompiled. 2. Improve security: Restrict data table access through permission control. 3. Simplify complex operations: combine multiple SQL statements to simplify application layer logic.

The working principle of MySQL query cache is to store the results of SELECT query, and when the same query is executed again, the cached results are directly returned. 1) Query cache improves database reading performance and finds cached results through hash values. 2) Simple configuration, set query_cache_type and query_cache_size in MySQL configuration file. 3) Use the SQL_NO_CACHE keyword to disable the cache of specific queries. 4) In high-frequency update environments, query cache may cause performance bottlenecks and needs to be optimized for use through monitoring and adjustment of parameters.

The reasons why MySQL is widely used in various projects include: 1. High performance and scalability, supporting multiple storage engines; 2. Easy to use and maintain, simple configuration and rich tools; 3. Rich ecosystem, attracting a large number of community and third-party tool support; 4. Cross-platform support, suitable for multiple operating systems.

The steps for upgrading MySQL database include: 1. Backup the database, 2. Stop the current MySQL service, 3. Install the new version of MySQL, 4. Start the new version of MySQL service, 5. Recover the database. Compatibility issues are required during the upgrade process, and advanced tools such as PerconaToolkit can be used for testing and optimization.

MySQL backup policies include logical backup, physical backup, incremental backup, replication-based backup, and cloud backup. 1. Logical backup uses mysqldump to export database structure and data, which is suitable for small databases and version migrations. 2. Physical backups are fast and comprehensive by copying data files, but require database consistency. 3. Incremental backup uses binary logging to record changes, which is suitable for large databases. 4. Replication-based backup reduces the impact on the production system by backing up from the server. 5. Cloud backups such as AmazonRDS provide automation solutions, but costs and control need to be considered. When selecting a policy, database size, downtime tolerance, recovery time, and recovery point goals should be considered.

MySQLclusteringenhancesdatabaserobustnessandscalabilitybydistributingdataacrossmultiplenodes.ItusestheNDBenginefordatareplicationandfaulttolerance,ensuringhighavailability.Setupinvolvesconfiguringmanagement,data,andSQLnodes,withcarefulmonitoringandpe

Optimizing database schema design in MySQL can improve performance through the following steps: 1. Index optimization: Create indexes on common query columns, balancing the overhead of query and inserting updates. 2. Table structure optimization: Reduce data redundancy through normalization or anti-normalization and improve access efficiency. 3. Data type selection: Use appropriate data types, such as INT instead of VARCHAR, to reduce storage space. 4. Partitioning and sub-table: For large data volumes, use partitioning and sub-table to disperse data to improve query and maintenance efficiency.

TooptimizeMySQLperformance,followthesesteps:1)Implementproperindexingtospeedupqueries,2)UseEXPLAINtoanalyzeandoptimizequeryperformance,3)Adjustserverconfigurationsettingslikeinnodb_buffer_pool_sizeandmax_connections,4)Usepartitioningforlargetablestoi


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 English version
Recommended: Win version, supports code prompts!

Zend Studio 13.0.1
Powerful PHP integrated development environment

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Notepad++7.3.1
Easy-to-use and free code editor
