Oracle体系结构-Buffer Cache详解

%3Ch3%20id%3D%22%E4%B8%80%E3%80%81%E8%AE%BE%E8%AE%A1%E5%AE%9A%E4%BD%8D%E4%B8%8E%E6%A0%B8%E5%BF%83%E4%BB%B7%E5%80%BC%22%3E%3Cstrong%3E%E4%B8%80%E3%80%81%E8%AE%BE%E8%AE%A1%E5%AE%9A%E4%BD%8D%E4%B8%8E%E6%A0%B8%E5%BF%83%E4%BB%B7%E5%80%BC%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ch4%20id%3D%221-%E6%A0%B9%E6%9C%AC%E7%9F%9B%E7%9B%BE%22%3E%3Cstrong%3E1.%20%E6%A0%B9%E6%9C%AC%E7%9F%9B%E7%9B%BE%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cul%3E%0A%3Cli%3E%3Cstrong%3E%E7%A3%81%E7%9B%98I%2FO%E7%93%B6%E9%A2%88%3C%2Fstrong%3E%EF%BC%9A%E6%95%B0%E6%8D%AE%E6%96%87%E4%BB%B6%E5%AD%98%E5%82%A8%E5%9C%A8%E6%9C%BA%E6%A2%B0%E7%A3%81%E7%9B%98%EF%BC%88%E4%BC%A0%E7%BB%9F%E5%9C%BA%E6%99%AF%EF%BC%89%E6%97%B6%EF%BC%8C%E9%9A%8F%E6%9C%BA%E8%AF%BB%E5%BB%B6%E8%BF%9F%E7%BA%A610ms%EF%BC%8C%E8%80%8C%E5%86%85%E5%AD%98%E7%BA%B3%E7%A7%92%E7%BA%A7%E8%AE%BF%E9%97%AE%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E4%BA%8B%E5%8A%A1%E5%93%8D%E5%BA%94%E8%A6%81%E6%B1%82%3C%2Fstrong%3E%EF%BC%9AOLTP%E7%B3%BB%E7%BB%9F%E9%9C%80%E6%AF%AB%E7%A7%92%E7%BA%A7%E5%93%8D%E5%BA%94%EF%BC%8C%E7%89%A9%E7%90%86I%2FO%E6%97%A0%E6%B3%95%E6%BB%A1%E8%B6%B3%E3%80%82%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Ch4%20id%3D%222-%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%22%3E%3Cstrong%3E2.%20%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cul%3E%0A%3Cli%3E%3Cstrong%3E%E7%BC%93%E5%86%B2%E6%B1%A0%EF%BC%88Buffer%20Cache%EF%BC%89%3C%2Fstrong%3E%EF%BC%9A%E5%9C%A8SGA%E4%B8%AD%E5%BC%80%E8%BE%9F%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F%EF%BC%8C%E7%BC%93%E5%AD%98%E9%A2%91%E7%B9%81%E8%AE%BF%E9%97%AE%E7%9A%84%E6%95%B0%E6%8D%AE%E5%9D%97%EF%BC%8C%E5%B0%86%E7%89%A9%E7%90%86%E8%AF%BB%E8%BD%AC%E5%8C%96%E4%B8%BA%E9%80%BB%E8%BE%91%E8%AF%BB%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E8%AE%BE%E8%AE%A1%E7%9B%AE%E6%A0%87%3C%2Fstrong%3E%EF%BC%9A%3Cul%3E%0A%3Cli%3E%3Cstrong%3E%E5%87%8F%E5%B0%91%E7%89%A9%E7%90%86I%2FO%3C%2Fstrong%3E%EF%BC%9A%E9%80%9A%E8%BF%87%E7%BC%93%E5%AD%98%E7%83%AD%E6%95%B0%E6%8D%AE%E5%9D%97%E9%99%8D%E4%BD%8E%E7%A3%81%E7%9B%98%E8%AE%BF%E9%97%AE%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E5%86%99%E5%BB%B6%E8%BF%9F%E4%BC%98%E5%8C%96%3C%2Fstrong%3E%EF%BC%9A%E8%84%8F%E5%9D%97%EF%BC%88Dirty%20Blocks%EF%BC%89%E6%89%B9%E9%87%8F%E5%86%99%E5%85%A5%E7%A3%81%E7%9B%98%EF%BC%88%E7%94%B1DBWn%E5%BC%82%E6%AD%A5%E5%A4%84%E7%90%86%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E5%A4%9A%E7%89%88%E6%9C%AC%E8%AF%BB%E4%B8%80%E8%87%B4%E6%80%A7%3C%2Fstrong%3E%EF%BC%9A%E9%80%9A%E8%BF%87CR%EF%BC%88Consistent%20Read%EF%BC%89%E5%9D%97%E5%AE%9E%E7%8E%B0%E9%9D%9E%E9%98%BB%E5%A1%9E%E6%9F%A5%E8%AF%A2%E3%80%82%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E4%BA%8C%E3%80%81%E6%A0%B8%E5%BF%83%E6%9E%B6%E6%9E%84%E4%B8%8E%E5%86%85%E5%AD%98%E7%BB%93%E6%9E%84%22%3E%3Cstrong%3E%E4%BA%8C%E3%80%81%E6%A0%B8%E5%BF%83%E6%9E%B6%E6%9E%84%E4%B8%8E%E5%86%85%E5%AD%98%E7%BB%93%E6%9E%84%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ch4%20id%3D%221-%E7%BC%93%E5%86%B2%E5%8C%BA%E5%9D%97%EF%BC%88buffer%EF%BC%89%E7%9A%84%E7%BB%93%E6%9E%84%22%3E%3Cstrong%3E1.%20%E7%BC%93%E5%86%B2%E5%8C%BA%E5%9D%97%EF%BC%88Buffer%EF%BC%89%E7%9A%84%E7%BB%93%E6%9E%84%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E7%BB%84%E6%88%90%E9%83%A8%E5%88%86%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E6%8F%8F%E8%BF%B0%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E6%95%B0%E6%8D%AE%E5%9D%97%E6%8B%B7%E8%B4%9D%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E4%BB%8E%E6%95%B0%E6%8D%AE%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E7%9A%84%E5%AE%8C%E6%95%B4%E5%9D%97%EF%BC%88%E9%BB%98%E8%AE%A4%E5%9D%97%E5%A4%A7%E5%B0%8F%3D8KB%EF%BC%8C%E6%94%AF%E6%8C%81%E5%A4%9A%E7%A7%8D%E5%B0%BA%E5%AF%B8%EF%BC%89%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E5%A4%B4%E4%BF%A1%E6%81%AF%EF%BC%88Header%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%8C%85%E5%90%AB%E7%8A%B6%E6%80%81%E3%80%81SCN%E3%80%81LRU%E9%93%BE%E6%8C%87%E9%92%88%E3%80%81TCH%EF%BC%88%E8%AE%BF%E9%97%AE%E8%AE%A1%E6%95%B0%EF%BC%89%E7%AD%89%E5%85%83%E6%95%B0%E6%8D%AE%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E8%AE%BF%E9%97%AE%E9%93%BE%E6%8C%87%E9%92%88%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E9%93%BE%E6%8E%A5%E5%88%B0LRU%EF%BC%88%E6%9C%80%E8%BF%91%E6%9C%80%E5%B0%91%E4%BD%BF%E7%94%A8%EF%BC%89%E9%93%BE%E6%88%96%E6%A3%80%E6%9F%A5%E7%82%B9%E9%98%9F%E5%88%97%EF%BC%88Checkpoint%20Queue%EF%BC%89%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Ch4%20id%3D%222-%E5%85%B3%E9%94%AE%E9%93%BE%E8%A1%A8%E7%AE%A1%E7%90%86%22%3E%3Cstrong%3E2.%20%E5%85%B3%E9%94%AE%E9%93%BE%E8%A1%A8%E7%AE%A1%E7%90%86%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E9%93%BE%E8%A1%A8%E7%B1%BB%E5%9E%8B%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E5%8A%9F%E8%83%BD%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ELRU%E9%93%BE%EF%BC%88Least%20Recently%20Used%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E7%AE%A1%E7%90%86%E7%A9%BA%E9%97%B2%E5%9D%97%E4%B8%8E%E5%86%B7%E5%9D%97%EF%BC%8C%E5%B0%BE%E9%83%A8%E4%BC%98%E5%85%88%E6%B7%98%E6%B1%B0%E3%80%82%E5%88%86%E4%B8%BA%E4%B8%BBLRU%E5%92%8C%E8%BE%85LRU%EF%BC%88%E5%B7%A5%E4%BD%9C%E9%9B%86%E7%AE%97%E6%B3%95%E4%BC%98%E5%8C%96%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E6%A3%80%E6%9F%A5%E7%82%B9%E9%98%9F%E5%88%97%EF%BC%88CKPTQ%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E6%8C%89%E9%A6%96%E6%AC%A1%E8%84%8F%E5%9D%97%E4%BF%AE%E6%94%B9%E6%97%B6%E9%97%B4%EF%BC%88LRBA%EF%BC%89%E6%8E%92%E5%BA%8F%EF%BC%8CDBWn%E6%8C%89%E6%AD%A4%E9%A1%BA%E5%BA%8F%E5%86%99%E7%9B%98%EF%BC%88Oracle%209i%2B%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E5%86%99%E9%98%9F%E5%88%97%EF%BC%88WRITEQ%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%BE%85%E5%86%99%E5%85%A5%E7%A3%81%E7%9B%98%E7%9A%84%E8%84%8F%E5%9D%97%E5%88%97%E8%A1%A8%EF%BC%88DBWn%E5%A4%84%E7%90%86%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Ch4%20id%3D%223-%E7%BC%93%E5%86%B2%E6%B1%A0%E5%88%86%E7%B1%BB%22%3E%3Cstrong%3E3.%20%E7%BC%93%E5%86%B2%E6%B1%A0%E5%88%86%E7%B1%BB%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E6%B1%A0%E7%B1%BB%E5%9E%8B%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E9%80%82%E7%94%A8%E5%9C%BA%E6%99%AF%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E5%8F%82%E6%95%B0%E6%8E%A7%E5%88%B6%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3EDefault%20Pool%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%B8%B8%E8%A7%84%E6%95%B0%E6%8D%AE%E5%9D%97%EF%BC%88%E9%BB%98%E8%AE%A4%E6%B1%A0%EF%BC%89%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3EDB_CACHE_SIZE%3C%2Fcode%3E%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3EKeep%20Pool%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E4%BF%9D%E7%95%99%E9%A2%91%E7%B9%81%E8%AE%BF%E9%97%AE%E7%9A%84%E5%B0%8F%E8%A1%A8%2F%E7%B4%A2%E5%BC%95%EF%BC%88%E9%81%BF%E5%85%8D%E8%A2%AB%E6%B7%98%E6%B1%B0%EF%BC%89%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3EDB_KEEP_CACHE_SIZE%3C%2Fcode%3E%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ERecycle%20Pool%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%AD%98%E6%94%BE%E5%A4%A7%E4%B8%94%E5%B0%91%E8%AE%BF%E9%97%AE%E7%9A%84%E5%AF%B9%E8%B1%A1%EF%BC%88%E9%81%BF%E5%85%8D%E6%B1%A1%E6%9F%93%E9%BB%98%E8%AE%A4%E6%B1%A0%EF%BC%89%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3EDB_RECYCLE_CACHE_SIZE%3C%2Fcode%3E%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ENVIDIA%20GPU%E6%B1%A0%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E12c%2B%E6%94%AF%E6%8C%81%EF%BC%8C%E9%80%9A%E8%BF%87GPU%E5%8A%A0%E9%80%9F%E6%89%AB%E6%8F%8F%EF%BC%88%E9%9C%80Exadata%EF%BC%89%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3E_DB_CACHE_DG_SIZE%3C%2Fcode%3E%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E4%B8%89%E3%80%81%E5%B7%A5%E4%BD%9C%E6%B5%81%E7%A8%8B%E4%B8%8E%E5%85%B3%E9%94%AE%E6%8A%80%E6%9C%AF%22%3E%3Cstrong%3E%E4%B8%89%E3%80%81%E5%B7%A5%E4%BD%9C%E6%B5%81%E7%A8%8B%E4%B8%8E%E5%85%B3%E9%94%AE%E6%8A%80%E6%9C%AF%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ch4%20id%3D%221-%E6%95%B0%E6%8D%AE%E8%AE%BF%E9%97%AE%E6%B5%81%E7%A8%8B%22%3E%3Cstrong%3E1.%20%E6%95%B0%E6%8D%AE%E8%AE%BF%E9%97%AE%E6%B5%81%E7%A8%8B%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cpre%3E%3Ccode%20class%3D%22language-mermaid%22%3Egraph%20TD%0A%20%20%20%20A%5B%E4%BC%9A%E8%AF%9D%E8%AF%B7%E6%B1%82%E6%95%B0%E6%8D%AE%E5%9D%97%5D%20--%26gt%3B%20B%7B%E5%9C%A8Buffer%20Cache%E4%B8%AD%E6%9F%A5%E6%89%BE%7D%0A%20%20%20%20B%20--%20%E5%91%BD%E4%B8%AD%20--%26gt%3B%20C%5B%E9%80%BB%E8%BE%91%E8%AF%BB%EF%BC%88Logical%20Read%EF%BC%89%5D%0A%20%20%20%20B%20--%20%E6%9C%AA%E5%91%BD%E4%B8%AD%20--%26gt%3B%20D%5B%E7%89%A9%E7%90%86%E8%AF%BB%EF%BC%88Physical%20Read%EF%BC%89%5D%0A%20%20%20%20D%20--%26gt%3B%20E%5BDBWn%E8%8B%A5%E9%9C%80%E7%A9%BA%E9%97%B4%E5%88%99%E5%86%99%E8%84%8F%E5%9D%97%5D%0A%20%20%20%20E%20--%26gt%3B%20F%5B%E4%BB%8E%E7%A3%81%E7%9B%98%E8%AF%BB%E5%9D%97%E5%88%B0%E7%A9%BA%E9%97%B2%E7%BC%93%E5%86%B2%E5%8C%BA%5D%0A%20%20%20%20F%20--%26gt%3B%20G%5B%E9%93%BE%E6%8E%A5%E5%88%B0LRU%E9%93%BE%E4%B8%AD%E9%83%A8%EF%BC%88%E9%81%BF%E5%85%8D%E7%AB%8B%E5%8D%B3%E6%B7%98%E6%B1%B0%EF%BC%89%5D%0A%3C%2Fcode%3E%3C%2Fpre%3E%0A%3Ch4%20id%3D%222-%E5%A4%9A%E7%89%88%E6%9C%AC%E8%AF%BB%E4%B8%80%E8%87%B4%E6%80%A7%EF%BC%88cr%E5%9D%97%EF%BC%89%22%3E%3Cstrong%3E2.%20%E5%A4%9A%E7%89%88%E6%9C%AC%E8%AF%BB%E4%B8%80%E8%87%B4%E6%80%A7%EF%BC%88CR%E5%9D%97%EF%BC%89%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cul%3E%0A%3Cli%3E%3Cstrong%3E%E8%A7%A6%E5%8F%91%E6%9D%A1%E4%BB%B6%3C%2Fstrong%3E%EF%BC%9A%E6%9F%A5%E8%AF%A2%E5%BC%80%E5%A7%8B%E6%97%B6%EF%BC%8C%E7%9B%AE%E6%A0%87%E5%9D%97%E5%B7%B2%E8%A2%AB%E4%BF%AE%E6%94%B9%EF%BC%88SCN%E9%AB%98%E4%BA%8E%E6%9F%A5%E8%AF%A2SCN%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E7%94%9F%E6%88%90%E6%B5%81%E7%A8%8B%3C%2Fstrong%3E%EF%BC%9A%3Col%3E%0A%3Cli%3E%E4%BB%8EUndo%E6%AE%B5%E8%AF%BB%E5%8F%96%E6%97%A7%E7%89%88%E6%9C%AC%E6%95%B0%E6%8D%AE%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%E5%9C%A8Buffer%20Cache%E4%B8%AD%E6%9E%84%E5%BB%BACR%E5%9D%97%EF%BC%88%E4%B8%8D%E5%86%99%E5%85%A5%E7%A3%81%E7%9B%98%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%E8%BF%94%E5%9B%9ECR%E5%9D%97%E7%BB%99%E6%9F%A5%E8%AF%A2%E4%BC%9A%E8%AF%9D%E3%80%82%3C%2Fli%3E%0A%3C%2Fol%3E%0A%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E5%85%B3%E9%94%AE%E8%A7%86%E5%9B%BE%3C%2Fstrong%3E%EF%BC%9A%3Ccode%3EV%24TRANSACTION.USED_UBLK%3C%2Fcode%3E%EF%BC%88%E7%9B%91%E6%8E%A7Undo%E5%9D%97%E4%BD%BF%E7%94%A8%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Ch4%20id%3D%223-%E7%BC%93%E5%86%B2%E6%B1%A0%E7%AE%97%E6%B3%95%E4%BC%98%E5%8C%96%22%3E%3Cstrong%3E3.%20%E7%BC%93%E5%86%B2%E6%B1%A0%E7%AE%97%E6%B3%95%E4%BC%98%E5%8C%96%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E7%AE%97%E6%B3%95%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E6%9C%BA%E5%88%B6%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E7%89%88%E6%9C%AC%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ETCH%EF%BC%88Touch%20Count%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%9D%97%E6%AF%8F%E8%A2%AB%E8%AE%BF%E9%97%AE%E4%B8%80%E6%AC%A1TCH%2B1%EF%BC%8C%E5%90%8E%E5%8F%B0%E8%BF%9B%E7%A8%8B%E6%8C%89TCH%E6%8E%92%E5%BA%8F%E5%86%B7%E7%83%AD%E5%9D%97%EF%BC%88%E9%AB%98TCH%E5%9D%97%E7%A7%BB%E8%87%B3LRU%E5%A4%B4%E9%83%A8%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3Ctd%3E8i%2B%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E5%B7%A5%E4%BD%9C%E9%9B%86%EF%BC%88Working%20Set%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%B0%86LRU%E9%93%BE%E5%88%86%E5%8C%BA%EF%BC%8C%E9%A2%91%E7%B9%81%E8%AE%BF%E9%97%AE%E7%9A%84%E5%9D%97%E5%9C%A8%E4%B8%BBLRU%E9%93%BE%E5%BE%AA%E7%8E%AF%EF%BC%8C%E5%87%8F%E5%B0%91%E9%94%81%E7%AB%9E%E4%BA%89%EF%BC%88%E7%94%B1%3Ccode%3E_DB_BLOCK_LRU_LATCHES%3C%2Fcode%3E%E6%8E%A7%E5%88%B6%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3Ctd%3E9i%2B%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E7%9B%B4%E6%8E%A5%E8%B7%AF%E5%BE%84%E8%AF%BB%EF%BC%88Direct%20Path%20Read%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E5%85%A8%E8%A1%A8%E6%89%AB%E6%8F%8F%E7%BB%95%E8%BF%87Buffer%20Cache%E7%9B%B4%E6%8E%A5%E8%BF%9BPGA%EF%BC%88%E9%81%BF%E5%85%8D%E6%B1%A1%E6%9F%93%E7%83%AD%E6%95%B0%E6%8D%AE%EF%BC%89%EF%BC%8C%E7%94%B1%3Ccode%3E_SMALL_TABLE_THRESHOLD%3C%2Fcode%3E%E9%98%88%E5%80%BC%E8%A7%A6%E5%8F%91%E3%80%82%3C%2Ftd%3E%0A%3Ctd%3E11g%2B%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E5%9B%9B%E3%80%81%E6%80%A7%E8%83%BD%E9%97%AE%E9%A2%98%E4%B8%8E%E8%B0%83%E4%BC%98%E7%AD%96%E7%95%A5%22%3E%3Cstrong%3E%E5%9B%9B%E3%80%81%E6%80%A7%E8%83%BD%E9%97%AE%E9%A2%98%E4%B8%8E%E8%B0%83%E4%BC%98%E7%AD%96%E7%95%A5%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ch4%20id%3D%221-%E6%A0%B8%E5%BF%83%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87%22%3E%3Cstrong%3E1.%20%E6%A0%B8%E5%BF%83%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E6%8C%87%E6%A0%87%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E8%AE%A1%E7%AE%97%E5%85%AC%E5%BC%8F%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E5%81%A5%E5%BA%B7%E5%80%BC%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E7%BC%93%E5%86%B2%E5%91%BD%E4%B8%AD%E7%8E%87%EF%BC%88Buffer%20Hit%20Ratio%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3E1%20-%20(physical%20reads%20%2F%20(db%20block%20gets%20%2B%20consistent%20gets))%3C%2Fcode%3E%3C%2Ftd%3E%0A%3Ctd%3E%26gt%3B90%25%EF%BC%88OLTP%EF%BC%89%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E7%A9%BA%E9%97%B2%E7%AD%89%E5%BE%85%EF%BC%88Free%20Buffer%20Wait%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3EV%24SYSTEM_EVENT%3C%2Fcode%3E%E4%B8%AD%E7%AD%89%E5%BE%85%E4%BA%8B%E4%BB%B6%3C%2Ftd%3E%0A%3Ctd%3E%E6%8C%81%E7%BB%AD%26gt%3B1%25%E9%9C%80%E4%BC%98%E5%8C%96%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E8%84%8F%E5%9D%97%E5%86%99%E5%BB%B6%E8%BF%9F%EF%BC%88DBWR%20Write%20Time%EF%BC%89%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%3Ccode%3EV%24SYSSTAT(%26%2339%3BDBWR%20buffers%20scanned%26%2339%3B)%3C%2Fcode%3E%3C%2Ftd%3E%0A%3Ctd%3E%E9%85%8D%E5%90%88I%2FO%E8%83%BD%E5%8A%9B%E8%AF%84%E4%BC%B0%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Ch4%20id%3D%222-%E5%85%B8%E5%9E%8B%E9%97%AE%E9%A2%98%E4%B8%8E%E4%BC%98%E5%8C%96%22%3E%3Cstrong%3E2.%20%E5%85%B8%E5%9E%8B%E9%97%AE%E9%A2%98%E4%B8%8E%E4%BC%98%E5%8C%96%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E9%97%AE%E9%A2%98%E7%8E%B0%E8%B1%A1%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E6%A0%B9%E5%9B%A0%E5%88%86%E6%9E%90%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E4%BC%98%E5%8C%96%E6%96%B9%E6%A1%88%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%E9%AB%98%E7%89%A9%E7%90%86%E8%AF%BB%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E7%BC%93%E5%AD%98%E4%B8%8D%E8%B6%B3%E6%88%96SQL%E5%85%A8%E8%A1%A8%E6%89%AB%E6%8F%8F%3C%2Ftd%3E%0A%3Ctd%3E-%20%E5%A2%9E%E5%A4%A7%20%3Ccode%3EDB_CACHE_SIZE%3C%2Fcode%3E%20%3Cbr%3E%20-%20%E4%BC%98%E5%8C%96SQL%EF%BC%88%E7%B4%A2%E5%BC%95%2F%E5%88%86%E5%8C%BA%EF%BC%89%20%3Cbr%3E%20-%20%E4%BD%BF%E7%94%A8Keep%20Pool%E7%BC%93%E5%AD%98%E5%B0%8F%E8%A1%A8%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3E%26quot%3Bfree%20buffer%20wait%26quot%3B%20%E7%AD%89%E5%BE%85%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3EDBWn%E5%86%99%E8%84%8F%E5%9D%97%E9%80%9F%E5%BA%A6%E8%B7%9F%E4%B8%8D%E4%B8%8A%E6%96%B0%E5%9D%97%E9%9C%80%E6%B1%82%3C%2Ftd%3E%0A%3Ctd%3E-%20%E5%A2%9E%E5%8A%A0DBWn%E8%BF%9B%E7%A8%8B%E6%95%B0%EF%BC%88%3Ccode%3EDB_WRITER_PROCESSES%3C%2Fcode%3E%EF%BC%89%20%3Cbr%3E%20-%20%E5%90%AF%E7%94%A8%E5%BC%82%E6%AD%A5I%2FO%EF%BC%88%3Ccode%3EDISK_ASYNCH_IO%3DTRUE%3C%2Fcode%3E%EF%BC%89%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ECR%E5%9D%97%E5%88%9B%E5%BB%BA%E5%BC%80%E9%94%80%E5%A4%A7%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E9%95%BF%E6%9F%A5%E8%AF%A2%E9%81%87%E5%88%B0%E9%AB%98DML%3C%2Ftd%3E%0A%3Ctd%3E-%20%E5%87%8F%E5%B0%91%E9%95%BF%E6%9F%A5%E8%AF%A2%20%3Cbr%3E%20-%20%E4%BC%98%E5%8C%96Undo%E8%A1%A8%E7%A9%BA%E9%97%B4%EF%BC%88%3Ccode%3EUNDO_RETENTION%3C%2Fcode%3E%EF%BC%89%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Ch4%20id%3D%223-%E5%A4%9A%E7%BC%93%E5%86%B2%E6%B1%A0%E9%85%8D%E7%BD%AE%E5%AE%9E%E8%B7%B5%22%3E%3Cstrong%3E3.%20%E5%A4%9A%E7%BC%93%E5%86%B2%E6%B1%A0%E9%85%8D%E7%BD%AE%E5%AE%9E%E8%B7%B5%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cpre%3E%3Ccode%20class%3D%22language-sql%22%3E%3Cspan%20class%3D%22token%20comment%22%3E--%201.%20%E5%B0%86%E9%AB%98%E9%A2%91%E5%B0%8F%E8%A1%A8%E5%9B%BA%E5%AE%9A%E5%88%B0Keep%20Pool%3C%2Fspan%3E%0A%3Cspan%20class%3D%22token%20keyword%22%3EALTER%3C%2Fspan%3E%20%3Cspan%20class%3D%22token%20keyword%22%3ETABLE%3C%2Fspan%3E%20sales%20STORAGE%20%3Cspan%20class%3D%22token%20punctuation%22%3E(%3C%2Fspan%3EBUFFER_POOL%20KEEP%3Cspan%20class%3D%22token%20punctuation%22%3E)%3C%2Fspan%3E%3Cspan%20class%3D%22token%20punctuation%22%3E%3B%3C%2Fspan%3E%0A%0A%3Cspan%20class%3D%22token%20comment%22%3E--%202.%20%E5%B0%86%E5%8E%86%E5%8F%B2%E5%A4%A7%E8%A1%A8%E7%A7%BB%E5%85%A5Recycle%20Pool%3C%2Fspan%3E%0A%3Cspan%20class%3D%22token%20keyword%22%3EALTER%3C%2Fspan%3E%20%3Cspan%20class%3D%22token%20keyword%22%3ETABLE%3C%2Fspan%3E%20archive_data%20STORAGE%20%3Cspan%20class%3D%22token%20punctuation%22%3E(%3C%2Fspan%3EBUFFER_POOL%20RECYCLE%3Cspan%20class%3D%22token%20punctuation%22%3E)%3C%2Fspan%3E%3Cspan%20class%3D%22token%20punctuation%22%3E%3B%3C%2Fspan%3E%0A%0A%3Cspan%20class%3D%22token%20comment%22%3E--%203.%20%E7%9B%91%E6%8E%A7%E6%B1%A0%E4%BD%BF%E7%94%A8%3C%2Fspan%3E%0A%3Cspan%20class%3D%22token%20keyword%22%3ESELECT%3C%2Fspan%3E%20%3Cspan%20class%3D%22token%20operator%22%3E*%3C%2Fspan%3E%20%3Cspan%20class%3D%22token%20keyword%22%3EFROM%3C%2Fspan%3E%20V%24BUFFER_POOL_STATISTICS%3Cspan%20class%3D%22token%20punctuation%22%3E%3B%3C%2Fspan%3E%0A%3C%2Fcode%3E%3C%2Fpre%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E4%BA%94%E3%80%81%E4%B8%8E%E5%85%B6%E4%BB%96%E7%BB%84%E4%BB%B6%E7%9A%84%E5%8D%8F%E5%90%8C%22%3E%3Cstrong%3E%E4%BA%94%E3%80%81%E4%B8%8E%E5%85%B6%E4%BB%96%E7%BB%84%E4%BB%B6%E7%9A%84%E5%8D%8F%E5%90%8C%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ctable%3E%0A%3Cthead%3E%0A%3Ctr%3E%0A%3Cth%3E%3Cstrong%3E%E7%BB%84%E4%BB%B6%3C%2Fstrong%3E%3C%2Fth%3E%0A%3Cth%3E%3Cstrong%3E%E4%BA%A4%E4%BA%92%E6%9C%BA%E5%88%B6%3C%2Fstrong%3E%3C%2Fth%3E%0A%3C%2Ftr%3E%0A%3C%2Fthead%3E%0A%3Ctbody%3E%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3EDBWn%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E8%84%8F%E5%9D%97%E7%94%B1DBWn%E6%89%B9%E9%87%8F%E5%86%99%E7%9B%98%EF%BC%9B%E7%BC%93%E5%86%B2%E6%B1%A0%E7%A9%BA%E9%97%B4%E4%B8%8D%E8%B6%B3%E6%97%B6%E5%94%A4%E9%86%92DBWn%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ELGWR%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E9%81%B5%E5%BE%AAWAL%E5%8E%9F%E5%88%99%EF%BC%9A%E6%97%A5%E5%BF%97%E5%85%88%E8%90%BD%E7%9B%98%EF%BC%8C%E8%84%8F%E5%9D%97%E6%89%8D%E8%83%BD%E5%86%99%E5%85%A5%EF%BC%88%3Ccode%3EV%24SYSTEM_EVENT%20%26%2339%3Blog%20file%20sync%26%2339%3B%3C%2Fcode%3E%EF%BC%89%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3ECKPT%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E6%A3%80%E6%9F%A5%E7%82%B9%E8%A7%A6%E5%8F%91DBWn%E5%86%99%E8%84%8F%E5%9D%97%EF%BC%8CCKPT%E6%9B%B4%E6%96%B0%E6%8E%A7%E5%88%B6%E6%96%87%E4%BB%B6SCN%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3Ctr%3E%0A%3Ctd%3E%3Cstrong%3EShared%20Pool%3C%2Fstrong%3E%3C%2Ftd%3E%0A%3Ctd%3E%E6%89%A7%E8%A1%8C%E8%AE%A1%E5%88%92%E7%94%9F%E6%88%90%E9%9C%80%E8%AE%BF%E9%97%AE%E8%A1%A8%E7%BB%93%E6%9E%84%EF%BC%88%E4%BE%9D%E8%B5%96Row%20Cache%EF%BC%89%EF%BC%8C%E7%89%A9%E7%90%86%E8%AF%BB%E4%BE%9D%E8%B5%96Buffer%20Cache%E3%80%82%3C%2Ftd%3E%0A%3C%2Ftr%3E%0A%3C%2Ftbody%3E%3C%2Ftable%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E5%85%AD%E3%80%81%E6%BC%94%E8%BF%9B%E4%B8%8E%E6%9C%80%E4%BD%B3%E5%AE%9E%E8%B7%B5%22%3E%3Cstrong%3E%E5%85%AD%E3%80%81%E6%BC%94%E8%BF%9B%E4%B8%8E%E6%9C%80%E4%BD%B3%E5%AE%9E%E8%B7%B5%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Ch4%20id%3D%221-%E7%8E%B0%E4%BB%A3%E6%9E%B6%E6%9E%84%E5%A2%9E%E5%BC%BA%22%3E%3Cstrong%3E1.%20%E7%8E%B0%E4%BB%A3%E6%9E%B6%E6%9E%84%E5%A2%9E%E5%BC%BA%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cul%3E%0A%3Cli%3E%3Cstrong%3EIn-Memory%20Option%3C%2Fstrong%3E%EF%BC%8812c%2B%EF%BC%89%EF%BC%9A%3Cbr%3E%E5%88%97%E5%BC%8F%E7%BC%93%E5%AD%98%EF%BC%88IM%E5%88%97%E5%AD%98%E5%82%A8%EF%BC%89%E4%B8%8E%E8%A1%8C%E5%BC%8FBuffer%20Cache%E4%BA%92%E8%A1%A5%EF%BC%8C%E5%8A%A0%E9%80%9F%E5%88%86%E6%9E%90%E6%9F%A5%E8%AF%A2%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3EADAPTIVE_LRU%3C%2Fstrong%3E%EF%BC%8819c%2B%EF%BC%89%EF%BC%9A%3Cbr%3E%E8%87%AA%E5%8A%A8%E8%B0%83%E6%95%B4LRU%E7%AE%97%E6%B3%95%E7%AD%96%E7%95%A5%E5%BA%94%E5%AF%B9%E8%B4%9F%E8%BD%BD%E5%8F%98%E5%8C%96%EF%BC%88%3Ccode%3E_ADAPTIVE_LRU_AGING%3C%2Fcode%3E%3DTRUE%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Ch4%20id%3D%222-%E8%AE%BE%E8%AE%A1%E5%90%AF%E7%A4%BA%22%3E%3Cstrong%3E2.%20%E8%AE%BE%E8%AE%A1%E5%90%AF%E7%A4%BA%3C%2Fstrong%3E%3C%2Fh4%3E%0A%3Cul%3E%0A%3Cli%3E%3Cstrong%3E%E7%83%AD%E6%95%B0%E6%8D%AE%E4%BF%9D%E7%95%99%3C%2Fstrong%3E%EF%BC%9A%E6%A0%B8%E5%BF%83%E8%A1%A8%E7%B4%A2%E5%BC%95%E5%9B%BA%E5%AE%9A%E5%88%B0Keep%20Pool%EF%BC%88%26lt%3B%E5%86%85%E5%AD%9810%25%EF%BC%89%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E5%86%B7%E7%83%AD%E5%88%86%E7%A6%BB%3C%2Fstrong%3E%EF%BC%9AETL%E4%B8%B4%E6%97%B6%E8%A1%A8%E4%BD%BF%E7%94%A8Recycle%20Pool%E3%80%82%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E7%9B%91%E6%8E%A7%E6%99%BA%E8%83%BD%E5%8C%96%3C%2Fstrong%3E%EF%BC%9A%3Cbr%3E%E4%BD%BF%E7%94%A8AWR%E6%8A%A5%E5%91%8A%EF%BC%88%3Ccode%3EBuffer%20Pool%20Advisory%3C%2Fcode%3E%EF%BC%89%E9%A2%84%E6%B5%8B%E7%BC%93%E5%AD%98%E6%89%A9%E5%AE%B9%E6%94%B6%E7%9B%8A%E3%80%82%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Chr%3E%0A%3Ch3%20id%3D%22%E4%B8%83%E3%80%81%E6%80%BB%E7%BB%93%EF%BC%9Abuffer-cache%E7%9A%84%E6%A0%B8%E5%BF%83%E4%BB%B7%E5%80%BC%22%3E%3Cstrong%3E%E4%B8%83%E3%80%81%E6%80%BB%E7%BB%93%EF%BC%9ABuffer%20Cache%E7%9A%84%E6%A0%B8%E5%BF%83%E4%BB%B7%E5%80%BC%3C%2Fstrong%3E%3C%2Fh3%3E%0A%3Cp%3EBuffer%20Cache%E6%98%AFOracle%20%3Cstrong%3E%E5%B9%B3%E8%A1%A1%E9%80%9F%E5%BA%A6%E4%B8%8E%E6%8C%81%E4%B9%85%E6%80%A7%E7%9A%84%E6%A0%B8%E5%BF%83%E5%BC%95%E6%93%8E%3C%2Fstrong%3E%EF%BC%8C%E5%85%B6%E8%AE%BE%E8%AE%A1%E7%B2%BE%E9%AB%93%E4%BD%93%E7%8E%B0%E4%B8%BA%EF%BC%9A%3C%2Fp%3E%0A%3Col%3E%0A%3Cli%3E%3Cstrong%3E%E6%97%B6%E7%A9%BA%E8%BD%AC%E6%8D%A2%3C%2Fstrong%3E%EF%BC%9A%E7%94%A8%E5%86%85%E5%AD%98%E7%A9%BA%E9%97%B4%E6%8D%A2%E5%8F%96I%2FO%E6%97%B6%E9%97%B4%EF%BC%8C%E7%89%A9%E7%90%86%E8%AF%BB%E5%BB%B6%E8%BF%9F%E9%99%8D%E4%BD%8E10%5E6%E5%80%8D%E7%BA%A7%E3%80%82%20%20%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E5%BC%82%E6%AD%A5%E5%8D%8F%E5%90%8C%3C%2Fstrong%3E%EF%BC%9A%E8%A7%A3%E8%80%A6%E4%BA%8B%E5%8A%A1%E5%A4%84%E7%90%86%EF%BC%88%E5%86%85%E5%AD%98%E4%BF%AE%E6%94%B9%EF%BC%89%E4%B8%8E%E6%8C%81%E4%B9%85%E5%8C%96%EF%BC%88DBWn%E5%86%99%E7%9B%98%EF%BC%89%E3%80%82%20%20%3C%2Fli%3E%0A%3Cli%3E%3Cstrong%3E%E6%99%BA%E8%83%BD%E6%B7%98%E6%B1%B0%3C%2Fstrong%3E%EF%BC%9ATCH%2B%E5%B7%A5%E4%BD%9C%E9%9B%86%E7%AE%97%E6%B3%95%E5%AE%9E%E7%8E%B0%E7%BC%93%E5%AD%98%E6%95%88%E7%8E%87%E6%9C%80%E5%A4%A7%E5%8C%96%E3%80%82%3C%2Fli%3E%0A%3C%2Fol%3E%0A%3Cblockquote%3E%0A%3Cp%3E%3Cstrong%3E%E6%B3%A8%3C%2Fstrong%3E%EF%BC%9A%E5%9C%A8%E4%BA%91%E5%8E%9F%E7%94%9F%E6%97%B6%E4%BB%A3%EF%BC%88%E5%A6%82Oracle%20Autonomous%20DB%EF%BC%89%EF%BC%8CBuffer%20Cache%E5%AE%9E%E7%8E%B0%E8%87%AA%E5%8A%A8%E5%8C%96%E8%B0%83%E4%BC%98%EF%BC%8C%E4%BD%86%E7%90%86%E8%A7%A3%E5%85%B6%E5%8E%9F%E7%90%86%E4%BB%8D%E6%98%AF%E8%AF%8A%E6%96%AD%E6%80%A7%E8%83%BD%E7%93%B6%E9%A2%88%E7%9A%84%E5%9F%BA%E7%9F%B3%E3%80%82%3C%2Fp%3E%0A%3C%2Fblockquote%3E%0A